Has anyone in space seen or photographed a simple laser pointer from Earth?Can Astronauts really see firework displays from space?What is the highest frequency at which Earth is, or has been, observed from space?Why doesn't Rayleigh Scattering obstruct Earth from space?Are there ANY verified satellite images of visible light coherent backscattering from Earth?Has anyone seen an actual spectrum of a satellite made by an amateur photographer?Is this the only eclipse where Moon's shadow on the Earth (umbra) has been photographed by a person in space?Has the Moon's shadow on the Earth (solar eclipse umbra) ever been photographed from beyond Earth orbit?What caused this bright light from the ground at night seen from the ISS?Has a lander/rover ever examined or photographed another mission?What is this huge, red, blinking light structure on Earth seen from the ISS in this video?Why does the Earth's atmosphere as seen from space have the colors that it does?

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Has anyone in space seen or photographed a simple laser pointer from Earth?


Can Astronauts really see firework displays from space?What is the highest frequency at which Earth is, or has been, observed from space?Why doesn't Rayleigh Scattering obstruct Earth from space?Are there ANY verified satellite images of visible light coherent backscattering from Earth?Has anyone seen an actual spectrum of a satellite made by an amateur photographer?Is this the only eclipse where Moon's shadow on the Earth (umbra) has been photographed by a person in space?Has the Moon's shadow on the Earth (solar eclipse umbra) ever been photographed from beyond Earth orbit?What caused this bright light from the ground at night seen from the ISS?Has a lander/rover ever examined or photographed another mission?What is this huge, red, blinking light structure on Earth seen from the ISS in this video?Why does the Earth's atmosphere as seen from space have the colors that it does?






.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;








6












$begingroup$


In the question How to make a green LED as visually bright as a 0 magnitude star? I worked out that a 100 mA green LED with a 10° half-angle 18 kilometers away would be as bright as a 0th magnitude star. So a 5 mW laser pointer with a miliradian divergence could potentially be seen even farther away, or at least photographed.



Question: Has anyone in space seen or photographed a laser pointer from Earth?



Note I'm asking about a laser pointer, not some high-powered laser used to bounce off of the Moon, or a powerful searchlight. Something that you can hold in your hand.










share|improve this question











$endgroup$







  • 1




    $begingroup$
    pbs.twimg.com/media/AocWtTtCMAEjFpt.jpg:large was the one I was talking about he mentioned in his talk, they also pointed a searchlight at the ISS. I believe, but don't quote me on this, that the laser pointer was seen while the spotlight was not. This is a picture from the ground, probably a short exposure (seeing the trail on the ISS). This was not an official experiment, rather one he set up with a friend himself. Here's the tweet: twitter.com/astro_Pettit/status/182139277566685184
    $endgroup$
    – Magic Octopus Urn
    8 hours ago







  • 1




    $begingroup$
    Also, the one Tristan mentioned, here's the tweet for that one yes, the blue dot is the light-source :).
    $endgroup$
    – Magic Octopus Urn
    8 hours ago










  • $begingroup$
    @MagicOctopusUrn These would be great posted in an answer, just copy/paste!
    $endgroup$
    – uhoh
    8 hours ago

















6












$begingroup$


In the question How to make a green LED as visually bright as a 0 magnitude star? I worked out that a 100 mA green LED with a 10° half-angle 18 kilometers away would be as bright as a 0th magnitude star. So a 5 mW laser pointer with a miliradian divergence could potentially be seen even farther away, or at least photographed.



Question: Has anyone in space seen or photographed a laser pointer from Earth?



Note I'm asking about a laser pointer, not some high-powered laser used to bounce off of the Moon, or a powerful searchlight. Something that you can hold in your hand.










share|improve this question











$endgroup$







  • 1




    $begingroup$
    pbs.twimg.com/media/AocWtTtCMAEjFpt.jpg:large was the one I was talking about he mentioned in his talk, they also pointed a searchlight at the ISS. I believe, but don't quote me on this, that the laser pointer was seen while the spotlight was not. This is a picture from the ground, probably a short exposure (seeing the trail on the ISS). This was not an official experiment, rather one he set up with a friend himself. Here's the tweet: twitter.com/astro_Pettit/status/182139277566685184
    $endgroup$
    – Magic Octopus Urn
    8 hours ago







  • 1




    $begingroup$
    Also, the one Tristan mentioned, here's the tweet for that one yes, the blue dot is the light-source :).
    $endgroup$
    – Magic Octopus Urn
    8 hours ago










  • $begingroup$
    @MagicOctopusUrn These would be great posted in an answer, just copy/paste!
    $endgroup$
    – uhoh
    8 hours ago













6












6








6


1



$begingroup$


In the question How to make a green LED as visually bright as a 0 magnitude star? I worked out that a 100 mA green LED with a 10° half-angle 18 kilometers away would be as bright as a 0th magnitude star. So a 5 mW laser pointer with a miliradian divergence could potentially be seen even farther away, or at least photographed.



Question: Has anyone in space seen or photographed a laser pointer from Earth?



Note I'm asking about a laser pointer, not some high-powered laser used to bounce off of the Moon, or a powerful searchlight. Something that you can hold in your hand.










share|improve this question











$endgroup$




In the question How to make a green LED as visually bright as a 0 magnitude star? I worked out that a 100 mA green LED with a 10° half-angle 18 kilometers away would be as bright as a 0th magnitude star. So a 5 mW laser pointer with a miliradian divergence could potentially be seen even farther away, or at least photographed.



Question: Has anyone in space seen or photographed a laser pointer from Earth?



Note I'm asking about a laser pointer, not some high-powered laser used to bounce off of the Moon, or a powerful searchlight. Something that you can hold in your hand.







photography earth-observation






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 1 hour ago







uhoh

















asked 9 hours ago









uhohuhoh

45.8k22 gold badges182 silver badges601 bronze badges




45.8k22 gold badges182 silver badges601 bronze badges







  • 1




    $begingroup$
    pbs.twimg.com/media/AocWtTtCMAEjFpt.jpg:large was the one I was talking about he mentioned in his talk, they also pointed a searchlight at the ISS. I believe, but don't quote me on this, that the laser pointer was seen while the spotlight was not. This is a picture from the ground, probably a short exposure (seeing the trail on the ISS). This was not an official experiment, rather one he set up with a friend himself. Here's the tweet: twitter.com/astro_Pettit/status/182139277566685184
    $endgroup$
    – Magic Octopus Urn
    8 hours ago







  • 1




    $begingroup$
    Also, the one Tristan mentioned, here's the tweet for that one yes, the blue dot is the light-source :).
    $endgroup$
    – Magic Octopus Urn
    8 hours ago










  • $begingroup$
    @MagicOctopusUrn These would be great posted in an answer, just copy/paste!
    $endgroup$
    – uhoh
    8 hours ago












  • 1




    $begingroup$
    pbs.twimg.com/media/AocWtTtCMAEjFpt.jpg:large was the one I was talking about he mentioned in his talk, they also pointed a searchlight at the ISS. I believe, but don't quote me on this, that the laser pointer was seen while the spotlight was not. This is a picture from the ground, probably a short exposure (seeing the trail on the ISS). This was not an official experiment, rather one he set up with a friend himself. Here's the tweet: twitter.com/astro_Pettit/status/182139277566685184
    $endgroup$
    – Magic Octopus Urn
    8 hours ago







  • 1




    $begingroup$
    Also, the one Tristan mentioned, here's the tweet for that one yes, the blue dot is the light-source :).
    $endgroup$
    – Magic Octopus Urn
    8 hours ago










  • $begingroup$
    @MagicOctopusUrn These would be great posted in an answer, just copy/paste!
    $endgroup$
    – uhoh
    8 hours ago







1




1




$begingroup$
pbs.twimg.com/media/AocWtTtCMAEjFpt.jpg:large was the one I was talking about he mentioned in his talk, they also pointed a searchlight at the ISS. I believe, but don't quote me on this, that the laser pointer was seen while the spotlight was not. This is a picture from the ground, probably a short exposure (seeing the trail on the ISS). This was not an official experiment, rather one he set up with a friend himself. Here's the tweet: twitter.com/astro_Pettit/status/182139277566685184
$endgroup$
– Magic Octopus Urn
8 hours ago





$begingroup$
pbs.twimg.com/media/AocWtTtCMAEjFpt.jpg:large was the one I was talking about he mentioned in his talk, they also pointed a searchlight at the ISS. I believe, but don't quote me on this, that the laser pointer was seen while the spotlight was not. This is a picture from the ground, probably a short exposure (seeing the trail on the ISS). This was not an official experiment, rather one he set up with a friend himself. Here's the tweet: twitter.com/astro_Pettit/status/182139277566685184
$endgroup$
– Magic Octopus Urn
8 hours ago





1




1




$begingroup$
Also, the one Tristan mentioned, here's the tweet for that one yes, the blue dot is the light-source :).
$endgroup$
– Magic Octopus Urn
8 hours ago




$begingroup$
Also, the one Tristan mentioned, here's the tweet for that one yes, the blue dot is the light-source :).
$endgroup$
– Magic Octopus Urn
8 hours ago












$begingroup$
@MagicOctopusUrn These would be great posted in an answer, just copy/paste!
$endgroup$
– uhoh
8 hours ago




$begingroup$
@MagicOctopusUrn These would be great posted in an answer, just copy/paste!
$endgroup$
– uhoh
8 hours ago










2 Answers
2






active

oldest

votes


















7












$begingroup$

Don Pettit mentioned a an experiment set up with the San Antonio Astronomical Scociety who pointed both spotlights and a blue laser pointer at the ISS, pictured below in a 5-10 second exposure:



enter image description here



I believe, but don't quote me on this, that the laser pointer was seen while the spotlight was not (with the aperture used). This is a picture from the ground, probably a short exposure (seeing the trail on the ISS). This was not an official experiment, rather one he set up with a friend who wanted to test a theory.




In addition to this, a picture of what the laser from the incident on March 4, 2012 can be seen in this tweet, also by Don Pettit, as Tristan previously mentioned, and would look approximately like this:



enter image description here



If you like cool, seemingly odd, but ultimately insightful experiments I highly suggest looking through his tweets and clicking into his blogs. He does many random experiments which have garnered him scientific patents and entries in research papers.




Quotes from an airspace article:




Early Sunday morning, at 01:27 our time, the San Antonio Astronomical Association, an amateur astronomy group, succeeded in flashing the space station with a one-watt blue laser and a white spotlight as we passed overhead. This took a number of engineering calculations. Projected beam diameters (assuming the propagation of a Gaussian wave for the laser) and intensity at the target had to be calculated. Tracking space station’s path as it streaked across the sky was another challenge. I used email to communicate with Robert Reeves, one of the association’s members. Considering that it takes a day, maybe more, for a simple exchange of messages (on space station we receive email drops two to three times a day), the whole event took weeks to plan.




Another photo of the light, from this source (I am unsure if they are the same image):



enter image description here



Note: This is all paraphrased from a talk he gave at NEAIC, so if it's wrong please correct me.






share|improve this answer











$endgroup$








  • 1




    $begingroup$
    This is cool and new to me. Pettit was (is) quite a character.
    $endgroup$
    – Organic Marble
    5 hours ago






  • 1




    $begingroup$
    @OrganicMarble did you see his space-cup ;)?
    $endgroup$
    – Magic Octopus Urn
    5 hours ago






  • 1




    $begingroup$
    When getting briefed on the Orbiter fuel cell system, he told us that liquid oxygen is light blue in color, and he knows because he had some in his garage.
    $endgroup$
    – Organic Marble
    5 hours ago










  • $begingroup$
    @organicmarble That's hilarious! Did he just keep it on hand? I wonder how much it costs to sustain -300F for periods of time in a garage.
    $endgroup$
    – Magic Octopus Urn
    5 hours ago


















4












$begingroup$

This has happened at least once, on March 4, 2012, there was an experiment to do just that.



YouTube: ISS FLASH PROJECT (lower your volume first)






share|improve this answer











$endgroup$












  • $begingroup$
    "This becomes complicated when highly collimated light from lasers are used, since the beam diameter at our orbital distance is about one kilometer, and this spot has to be tracking us while in the dark." Quite the steady hand! update: Annotation in the video says the laser is mounted on a telescope.
    $endgroup$
    – uhoh
    8 hours ago














Your Answer








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2 Answers
2






active

oldest

votes








2 Answers
2






active

oldest

votes









active

oldest

votes






active

oldest

votes









7












$begingroup$

Don Pettit mentioned a an experiment set up with the San Antonio Astronomical Scociety who pointed both spotlights and a blue laser pointer at the ISS, pictured below in a 5-10 second exposure:



enter image description here



I believe, but don't quote me on this, that the laser pointer was seen while the spotlight was not (with the aperture used). This is a picture from the ground, probably a short exposure (seeing the trail on the ISS). This was not an official experiment, rather one he set up with a friend who wanted to test a theory.




In addition to this, a picture of what the laser from the incident on March 4, 2012 can be seen in this tweet, also by Don Pettit, as Tristan previously mentioned, and would look approximately like this:



enter image description here



If you like cool, seemingly odd, but ultimately insightful experiments I highly suggest looking through his tweets and clicking into his blogs. He does many random experiments which have garnered him scientific patents and entries in research papers.




Quotes from an airspace article:




Early Sunday morning, at 01:27 our time, the San Antonio Astronomical Association, an amateur astronomy group, succeeded in flashing the space station with a one-watt blue laser and a white spotlight as we passed overhead. This took a number of engineering calculations. Projected beam diameters (assuming the propagation of a Gaussian wave for the laser) and intensity at the target had to be calculated. Tracking space station’s path as it streaked across the sky was another challenge. I used email to communicate with Robert Reeves, one of the association’s members. Considering that it takes a day, maybe more, for a simple exchange of messages (on space station we receive email drops two to three times a day), the whole event took weeks to plan.




Another photo of the light, from this source (I am unsure if they are the same image):



enter image description here



Note: This is all paraphrased from a talk he gave at NEAIC, so if it's wrong please correct me.






share|improve this answer











$endgroup$








  • 1




    $begingroup$
    This is cool and new to me. Pettit was (is) quite a character.
    $endgroup$
    – Organic Marble
    5 hours ago






  • 1




    $begingroup$
    @OrganicMarble did you see his space-cup ;)?
    $endgroup$
    – Magic Octopus Urn
    5 hours ago






  • 1




    $begingroup$
    When getting briefed on the Orbiter fuel cell system, he told us that liquid oxygen is light blue in color, and he knows because he had some in his garage.
    $endgroup$
    – Organic Marble
    5 hours ago










  • $begingroup$
    @organicmarble That's hilarious! Did he just keep it on hand? I wonder how much it costs to sustain -300F for periods of time in a garage.
    $endgroup$
    – Magic Octopus Urn
    5 hours ago















7












$begingroup$

Don Pettit mentioned a an experiment set up with the San Antonio Astronomical Scociety who pointed both spotlights and a blue laser pointer at the ISS, pictured below in a 5-10 second exposure:



enter image description here



I believe, but don't quote me on this, that the laser pointer was seen while the spotlight was not (with the aperture used). This is a picture from the ground, probably a short exposure (seeing the trail on the ISS). This was not an official experiment, rather one he set up with a friend who wanted to test a theory.




In addition to this, a picture of what the laser from the incident on March 4, 2012 can be seen in this tweet, also by Don Pettit, as Tristan previously mentioned, and would look approximately like this:



enter image description here



If you like cool, seemingly odd, but ultimately insightful experiments I highly suggest looking through his tweets and clicking into his blogs. He does many random experiments which have garnered him scientific patents and entries in research papers.




Quotes from an airspace article:




Early Sunday morning, at 01:27 our time, the San Antonio Astronomical Association, an amateur astronomy group, succeeded in flashing the space station with a one-watt blue laser and a white spotlight as we passed overhead. This took a number of engineering calculations. Projected beam diameters (assuming the propagation of a Gaussian wave for the laser) and intensity at the target had to be calculated. Tracking space station’s path as it streaked across the sky was another challenge. I used email to communicate with Robert Reeves, one of the association’s members. Considering that it takes a day, maybe more, for a simple exchange of messages (on space station we receive email drops two to three times a day), the whole event took weeks to plan.




Another photo of the light, from this source (I am unsure if they are the same image):



enter image description here



Note: This is all paraphrased from a talk he gave at NEAIC, so if it's wrong please correct me.






share|improve this answer











$endgroup$








  • 1




    $begingroup$
    This is cool and new to me. Pettit was (is) quite a character.
    $endgroup$
    – Organic Marble
    5 hours ago






  • 1




    $begingroup$
    @OrganicMarble did you see his space-cup ;)?
    $endgroup$
    – Magic Octopus Urn
    5 hours ago






  • 1




    $begingroup$
    When getting briefed on the Orbiter fuel cell system, he told us that liquid oxygen is light blue in color, and he knows because he had some in his garage.
    $endgroup$
    – Organic Marble
    5 hours ago










  • $begingroup$
    @organicmarble That's hilarious! Did he just keep it on hand? I wonder how much it costs to sustain -300F for periods of time in a garage.
    $endgroup$
    – Magic Octopus Urn
    5 hours ago













7












7








7





$begingroup$

Don Pettit mentioned a an experiment set up with the San Antonio Astronomical Scociety who pointed both spotlights and a blue laser pointer at the ISS, pictured below in a 5-10 second exposure:



enter image description here



I believe, but don't quote me on this, that the laser pointer was seen while the spotlight was not (with the aperture used). This is a picture from the ground, probably a short exposure (seeing the trail on the ISS). This was not an official experiment, rather one he set up with a friend who wanted to test a theory.




In addition to this, a picture of what the laser from the incident on March 4, 2012 can be seen in this tweet, also by Don Pettit, as Tristan previously mentioned, and would look approximately like this:



enter image description here



If you like cool, seemingly odd, but ultimately insightful experiments I highly suggest looking through his tweets and clicking into his blogs. He does many random experiments which have garnered him scientific patents and entries in research papers.




Quotes from an airspace article:




Early Sunday morning, at 01:27 our time, the San Antonio Astronomical Association, an amateur astronomy group, succeeded in flashing the space station with a one-watt blue laser and a white spotlight as we passed overhead. This took a number of engineering calculations. Projected beam diameters (assuming the propagation of a Gaussian wave for the laser) and intensity at the target had to be calculated. Tracking space station’s path as it streaked across the sky was another challenge. I used email to communicate with Robert Reeves, one of the association’s members. Considering that it takes a day, maybe more, for a simple exchange of messages (on space station we receive email drops two to three times a day), the whole event took weeks to plan.




Another photo of the light, from this source (I am unsure if they are the same image):



enter image description here



Note: This is all paraphrased from a talk he gave at NEAIC, so if it's wrong please correct me.






share|improve this answer











$endgroup$



Don Pettit mentioned a an experiment set up with the San Antonio Astronomical Scociety who pointed both spotlights and a blue laser pointer at the ISS, pictured below in a 5-10 second exposure:



enter image description here



I believe, but don't quote me on this, that the laser pointer was seen while the spotlight was not (with the aperture used). This is a picture from the ground, probably a short exposure (seeing the trail on the ISS). This was not an official experiment, rather one he set up with a friend who wanted to test a theory.




In addition to this, a picture of what the laser from the incident on March 4, 2012 can be seen in this tweet, also by Don Pettit, as Tristan previously mentioned, and would look approximately like this:



enter image description here



If you like cool, seemingly odd, but ultimately insightful experiments I highly suggest looking through his tweets and clicking into his blogs. He does many random experiments which have garnered him scientific patents and entries in research papers.




Quotes from an airspace article:




Early Sunday morning, at 01:27 our time, the San Antonio Astronomical Association, an amateur astronomy group, succeeded in flashing the space station with a one-watt blue laser and a white spotlight as we passed overhead. This took a number of engineering calculations. Projected beam diameters (assuming the propagation of a Gaussian wave for the laser) and intensity at the target had to be calculated. Tracking space station’s path as it streaked across the sky was another challenge. I used email to communicate with Robert Reeves, one of the association’s members. Considering that it takes a day, maybe more, for a simple exchange of messages (on space station we receive email drops two to three times a day), the whole event took weeks to plan.




Another photo of the light, from this source (I am unsure if they are the same image):



enter image description here



Note: This is all paraphrased from a talk he gave at NEAIC, so if it's wrong please correct me.







share|improve this answer














share|improve this answer



share|improve this answer








edited 5 hours ago

























answered 8 hours ago









Magic Octopus UrnMagic Octopus Urn

3,7321 gold badge15 silver badges52 bronze badges




3,7321 gold badge15 silver badges52 bronze badges







  • 1




    $begingroup$
    This is cool and new to me. Pettit was (is) quite a character.
    $endgroup$
    – Organic Marble
    5 hours ago






  • 1




    $begingroup$
    @OrganicMarble did you see his space-cup ;)?
    $endgroup$
    – Magic Octopus Urn
    5 hours ago






  • 1




    $begingroup$
    When getting briefed on the Orbiter fuel cell system, he told us that liquid oxygen is light blue in color, and he knows because he had some in his garage.
    $endgroup$
    – Organic Marble
    5 hours ago










  • $begingroup$
    @organicmarble That's hilarious! Did he just keep it on hand? I wonder how much it costs to sustain -300F for periods of time in a garage.
    $endgroup$
    – Magic Octopus Urn
    5 hours ago












  • 1




    $begingroup$
    This is cool and new to me. Pettit was (is) quite a character.
    $endgroup$
    – Organic Marble
    5 hours ago






  • 1




    $begingroup$
    @OrganicMarble did you see his space-cup ;)?
    $endgroup$
    – Magic Octopus Urn
    5 hours ago






  • 1




    $begingroup$
    When getting briefed on the Orbiter fuel cell system, he told us that liquid oxygen is light blue in color, and he knows because he had some in his garage.
    $endgroup$
    – Organic Marble
    5 hours ago










  • $begingroup$
    @organicmarble That's hilarious! Did he just keep it on hand? I wonder how much it costs to sustain -300F for periods of time in a garage.
    $endgroup$
    – Magic Octopus Urn
    5 hours ago







1




1




$begingroup$
This is cool and new to me. Pettit was (is) quite a character.
$endgroup$
– Organic Marble
5 hours ago




$begingroup$
This is cool and new to me. Pettit was (is) quite a character.
$endgroup$
– Organic Marble
5 hours ago




1




1




$begingroup$
@OrganicMarble did you see his space-cup ;)?
$endgroup$
– Magic Octopus Urn
5 hours ago




$begingroup$
@OrganicMarble did you see his space-cup ;)?
$endgroup$
– Magic Octopus Urn
5 hours ago




1




1




$begingroup$
When getting briefed on the Orbiter fuel cell system, he told us that liquid oxygen is light blue in color, and he knows because he had some in his garage.
$endgroup$
– Organic Marble
5 hours ago




$begingroup$
When getting briefed on the Orbiter fuel cell system, he told us that liquid oxygen is light blue in color, and he knows because he had some in his garage.
$endgroup$
– Organic Marble
5 hours ago












$begingroup$
@organicmarble That's hilarious! Did he just keep it on hand? I wonder how much it costs to sustain -300F for periods of time in a garage.
$endgroup$
– Magic Octopus Urn
5 hours ago




$begingroup$
@organicmarble That's hilarious! Did he just keep it on hand? I wonder how much it costs to sustain -300F for periods of time in a garage.
$endgroup$
– Magic Octopus Urn
5 hours ago













4












$begingroup$

This has happened at least once, on March 4, 2012, there was an experiment to do just that.



YouTube: ISS FLASH PROJECT (lower your volume first)






share|improve this answer











$endgroup$












  • $begingroup$
    "This becomes complicated when highly collimated light from lasers are used, since the beam diameter at our orbital distance is about one kilometer, and this spot has to be tracking us while in the dark." Quite the steady hand! update: Annotation in the video says the laser is mounted on a telescope.
    $endgroup$
    – uhoh
    8 hours ago
















4












$begingroup$

This has happened at least once, on March 4, 2012, there was an experiment to do just that.



YouTube: ISS FLASH PROJECT (lower your volume first)






share|improve this answer











$endgroup$












  • $begingroup$
    "This becomes complicated when highly collimated light from lasers are used, since the beam diameter at our orbital distance is about one kilometer, and this spot has to be tracking us while in the dark." Quite the steady hand! update: Annotation in the video says the laser is mounted on a telescope.
    $endgroup$
    – uhoh
    8 hours ago














4












4








4





$begingroup$

This has happened at least once, on March 4, 2012, there was an experiment to do just that.



YouTube: ISS FLASH PROJECT (lower your volume first)






share|improve this answer











$endgroup$



This has happened at least once, on March 4, 2012, there was an experiment to do just that.



YouTube: ISS FLASH PROJECT (lower your volume first)







share|improve this answer














share|improve this answer



share|improve this answer








edited 8 hours ago









uhoh

45.8k22 gold badges182 silver badges601 bronze badges




45.8k22 gold badges182 silver badges601 bronze badges










answered 8 hours ago









TristanTristan

11.7k1 gold badge38 silver badges59 bronze badges




11.7k1 gold badge38 silver badges59 bronze badges











  • $begingroup$
    "This becomes complicated when highly collimated light from lasers are used, since the beam diameter at our orbital distance is about one kilometer, and this spot has to be tracking us while in the dark." Quite the steady hand! update: Annotation in the video says the laser is mounted on a telescope.
    $endgroup$
    – uhoh
    8 hours ago

















  • $begingroup$
    "This becomes complicated when highly collimated light from lasers are used, since the beam diameter at our orbital distance is about one kilometer, and this spot has to be tracking us while in the dark." Quite the steady hand! update: Annotation in the video says the laser is mounted on a telescope.
    $endgroup$
    – uhoh
    8 hours ago
















$begingroup$
"This becomes complicated when highly collimated light from lasers are used, since the beam diameter at our orbital distance is about one kilometer, and this spot has to be tracking us while in the dark." Quite the steady hand! update: Annotation in the video says the laser is mounted on a telescope.
$endgroup$
– uhoh
8 hours ago





$begingroup$
"This becomes complicated when highly collimated light from lasers are used, since the beam diameter at our orbital distance is about one kilometer, and this spot has to be tracking us while in the dark." Quite the steady hand! update: Annotation in the video says the laser is mounted on a telescope.
$endgroup$
– uhoh
8 hours ago


















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