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Can we see the USA flag on the Moon from Earth? [duplicate]

Were the Apollo lunar activities observed from Earth?How did the Apollo astronauts train for the 1/6G lunar landing?What is the marginal cost of *landing* on the Moon?Why didn't Apollo land on the Lunar poles?When Chang'e-3 landed on the moon, did LADEE notice?What was learned from study of Surveyor-3's components, retrieved and returned to Earth by Apollo-12?How would the Apollo telescope have worked in the Apollo command module? Where would it be located and how would it be operated?Was there a technical reason why Apollo 10 didn't land on the moon?Launch window for the Apollo Lunar Module?

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3

$begingroup$

This question already has an answer here:

• 
  Were the Apollo lunar activities observed from Earth?
  
  3 answers
  
  

Is it possible one day to see landing site flags on the Moon from Earth or from space without having to land using a telescope as technology progresses?

Highly Related: Were the Apollo lunar activities observed from Earth?

the-moon lunar-landing observation space-telescope landing-site

share|improve this question

edited Apr 17 at 19:52

Muze the good Troll.

asked Apr 17 at 4:32

Muze the good Troll.Muze the good Troll.

1

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marked as duplicate by Antzi, Jan Doggen, GremlinWranger, Manu H, DrSheldon Apr 17 at 11:52

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
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  Title and body don't match.
  $endgroup$
  – Antzi
  Apr 17 at 5:44
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
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  @Antzi fixed it thanks.
  $endgroup$
  – Muze the good Troll.
  Apr 17 at 5:53
  

  
  
  
  


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  Directly from the Earth, the answer is no, but as the answer says, we can see it from Moon orbit.
  $endgroup$
  – peterh
  Apr 17 at 6:58
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Although the other question is related it is not a duplicate it is talking about something a 1969. Where mine is asking for current technology.
  $endgroup$
  – Muze the good Troll.
  Apr 17 at 15:55
  

  
  
  
  


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  The revision doesn't make the question better, imho. The fundamental physical problems stay the same, and everything else is pure speculation. Its already possible to see it from space, you just need to get into a lunar orbit - the lower the better you can see it.
  $endgroup$
  – Polygnome
  Apr 17 at 20:48
  
  

  
  
  
  

 | 
show 1 more comment

3

$begingroup$

This question already has an answer here:

• 
  Were the Apollo lunar activities observed from Earth?
  
  3 answers
  
  

Is it possible one day to see landing site flags on the Moon from Earth or from space without having to land using a telescope as technology progresses?

Highly Related: Were the Apollo lunar activities observed from Earth?

the-moon lunar-landing observation space-telescope landing-site

share|improve this question

edited Apr 17 at 19:52

Muze the good Troll.

asked Apr 17 at 4:32

Muze the good Troll.Muze the good Troll.

1

$endgroup$

marked as duplicate by Antzi, Jan Doggen, GremlinWranger, Manu H, DrSheldon Apr 17 at 11:52

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Title and body don't match.
  $endgroup$
  – Antzi
  Apr 17 at 5:44
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @Antzi fixed it thanks.
  $endgroup$
  – Muze the good Troll.
  Apr 17 at 5:53
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Directly from the Earth, the answer is no, but as the answer says, we can see it from Moon orbit.
  $endgroup$
  – peterh
  Apr 17 at 6:58
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Although the other question is related it is not a duplicate it is talking about something a 1969. Where mine is asking for current technology.
  $endgroup$
  – Muze the good Troll.
  Apr 17 at 15:55
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  The revision doesn't make the question better, imho. The fundamental physical problems stay the same, and everything else is pure speculation. Its already possible to see it from space, you just need to get into a lunar orbit - the lower the better you can see it.
  $endgroup$
  – Polygnome
  Apr 17 at 20:48
  
  

  
  
  
  

 | 
show 1 more comment

$begingroup$

This question already has an answer here:

• 
  Were the Apollo lunar activities observed from Earth?
  
  3 answers
  
  

Is it possible one day to see landing site flags on the Moon from Earth or from space without having to land using a telescope as technology progresses?

Highly Related: Were the Apollo lunar activities observed from Earth?

the-moon lunar-landing observation space-telescope landing-site

share|improve this question

edited Apr 17 at 19:52

Muze the good Troll.

asked Apr 17 at 4:32

Muze the good Troll.Muze the good Troll.

1

$endgroup$

share|improve this question

edited Apr 17 at 19:52

Muze the good Troll.

asked Apr 17 at 4:32

Muze the good Troll.Muze the good Troll.

1

share|improve this question

edited Apr 17 at 19:52

Muze the good Troll.

asked Apr 17 at 4:32

Muze the good Troll.Muze the good Troll.

1

asked Apr 17 at 4:32

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asked Apr 17 at 4:32

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2 Answers
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10

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I am not aware of an optical telescope capable of showing proof from earth. Part of the reason is the flags are pretty small and it's a very long distance. However, you can see the flags or what is left of them and the landing sites using images from the Lunar Reconnaissance Orbiter (LRO).

The LRO was able to use it's camera to document all of the Apollo landing sites. In 2011, Eric M. Jones collated the images to show the conditions of the landing sites and evidence of the condition flags was presented.

Apollo 11

Buzz Aldrin indicated he saw the flag knocked over on liftoff from the moon.

This quote was from the manufacturer:

Dennis Lacarrubba, whose New Jersey-based company, Annin, made the
flag

and sold it to NASA for $5.50 in 1969, considers what might happen to an
ordinary nylon flag left outside for 39 years on Earth, let alone on the moon.
He thinks for a few seconds. “I can’t believe there would be anything left,”
he concludes. “I gotta be honest with you. It’s gonna be ashes.”

Apollo 12

Apollo 14 and 15 had no evidence from the images of the flags. It was thought they may have been destroyed by the exhaust gases on liftoff.

Apollo 16

Apollo 17

More Information

• https://www.hq.nasa.gov/alsj/ApolloFlags-Condition.html

share|improve this answer

edited Apr 17 at 18:40

answered Apr 17 at 5:30

gwallygwally

54133 silver badges88 bronze badges

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Interesting, but not expolicitly answering the question. Yes, you can see a flag shadows from moon orbit, but the question was about the flag and about the observation source Earth.
  $endgroup$
  – Jakuje
  Apr 17 at 12:04
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @Muse seems to think the moon landings were faked. I posted this to show there are photos of the landing sites. I'll add the fact you can't see them from the earth.
  $endgroup$
  – gwally
  Apr 17 at 18:36
  

  
  
  
  

add a comment
 | 

13

$begingroup$

A flag would be about five hundred micro arcseconds. (about 1 meter, at around 375 Mm)

The Event Horizon Telescope has a resolution of about 20 micro arcseconds.

Therefore, EHT could resolve a flag on the surface of the moon if it were a radio source.

However, to view it optically would require around a 350 meter aperture. The largest 'single' telescope today is around 10 meters

The Cambridge Optical Aperture Synthesis Telescope (COAST) - the largest I'm aware of - can resolve to around 1000 micro arcseconds, so wouldn't be able to see a flag.

share|improve this answer

edited Apr 17 at 11:05

answered Apr 17 at 9:01

JCRMJCRM

4,35522 gold badges1313 silver badges3636 bronze badges

$endgroup$

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  oops, previous answer was out by a $10^3$, changing the outcome.
  $endgroup$
  – JCRM
  Apr 17 at 9:02
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  hope it's not offtopic but would it be possible to couple optical telescopes in the same way the EHT did?
  $endgroup$
  – undefined
  Apr 17 at 9:58
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  That's largely what COAST does @undefined, except optically not analytically. To complicate things, one also needs to collect enough light to see it, so it would need a large collection surface, as well as aperture (even with long exposure times)
  $endgroup$
  – JCRM
  Apr 17 at 10:26
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  oh thank you, JCRM. I thought the COAST is only one large telescope and not many. Thank you :)
  $endgroup$
  – undefined
  Apr 17 at 10:30
  

  
  
  
  

add a comment
 | 

10

$begingroup$

I am not aware of an optical telescope capable of showing proof from earth. Part of the reason is the flags are pretty small and it's a very long distance. However, you can see the flags or what is left of them and the landing sites using images from the Lunar Reconnaissance Orbiter (LRO).

The LRO was able to use it's camera to document all of the Apollo landing sites. In 2011, Eric M. Jones collated the images to show the conditions of the landing sites and evidence of the condition flags was presented.

Apollo 11

Buzz Aldrin indicated he saw the flag knocked over on liftoff from the moon.

This quote was from the manufacturer:

Dennis Lacarrubba, whose New Jersey-based company, Annin, made the
flag

and sold it to NASA for $5.50 in 1969, considers what might happen to an
ordinary nylon flag left outside for 39 years on Earth, let alone on the moon.
He thinks for a few seconds. “I can’t believe there would be anything left,”
he concludes. “I gotta be honest with you. It’s gonna be ashes.”

Apollo 12

Apollo 14 and 15 had no evidence from the images of the flags. It was thought they may have been destroyed by the exhaust gases on liftoff.

Apollo 16

Apollo 17

More Information

• https://www.hq.nasa.gov/alsj/ApolloFlags-Condition.html

share|improve this answer

edited Apr 17 at 18:40

answered Apr 17 at 5:30

gwallygwally

54133 silver badges88 bronze badges

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Interesting, but not expolicitly answering the question. Yes, you can see a flag shadows from moon orbit, but the question was about the flag and about the observation source Earth.
  $endgroup$
  – Jakuje
  Apr 17 at 12:04
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @Muse seems to think the moon landings were faked. I posted this to show there are photos of the landing sites. I'll add the fact you can't see them from the earth.
  $endgroup$
  – gwally
  Apr 17 at 18:36
  

  
  
  
  

add a comment
 | 

10

$begingroup$

I am not aware of an optical telescope capable of showing proof from earth. Part of the reason is the flags are pretty small and it's a very long distance. However, you can see the flags or what is left of them and the landing sites using images from the Lunar Reconnaissance Orbiter (LRO).

The LRO was able to use it's camera to document all of the Apollo landing sites. In 2011, Eric M. Jones collated the images to show the conditions of the landing sites and evidence of the condition flags was presented.

Apollo 11

Buzz Aldrin indicated he saw the flag knocked over on liftoff from the moon.

This quote was from the manufacturer:

Dennis Lacarrubba, whose New Jersey-based company, Annin, made the
flag

and sold it to NASA for $5.50 in 1969, considers what might happen to an
ordinary nylon flag left outside for 39 years on Earth, let alone on the moon.
He thinks for a few seconds. “I can’t believe there would be anything left,”
he concludes. “I gotta be honest with you. It’s gonna be ashes.”

Apollo 12

Apollo 14 and 15 had no evidence from the images of the flags. It was thought they may have been destroyed by the exhaust gases on liftoff.

Apollo 16

Apollo 17

More Information

• https://www.hq.nasa.gov/alsj/ApolloFlags-Condition.html

share|improve this answer

edited Apr 17 at 18:40

answered Apr 17 at 5:30

gwallygwally

54133 silver badges88 bronze badges

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Interesting, but not expolicitly answering the question. Yes, you can see a flag shadows from moon orbit, but the question was about the flag and about the observation source Earth.
  $endgroup$
  – Jakuje
  Apr 17 at 12:04
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @Muse seems to think the moon landings were faked. I posted this to show there are photos of the landing sites. I'll add the fact you can't see them from the earth.
  $endgroup$
  – gwally
  Apr 17 at 18:36
  

  
  
  
  

add a comment
 | 

$begingroup$

I am not aware of an optical telescope capable of showing proof from earth. Part of the reason is the flags are pretty small and it's a very long distance. However, you can see the flags or what is left of them and the landing sites using images from the Lunar Reconnaissance Orbiter (LRO).

The LRO was able to use it's camera to document all of the Apollo landing sites. In 2011, Eric M. Jones collated the images to show the conditions of the landing sites and evidence of the condition flags was presented.

Apollo 11

Buzz Aldrin indicated he saw the flag knocked over on liftoff from the moon.

This quote was from the manufacturer:

Dennis Lacarrubba, whose New Jersey-based company, Annin, made the
flag

and sold it to NASA for $5.50 in 1969, considers what might happen to an
ordinary nylon flag left outside for 39 years on Earth, let alone on the moon.
He thinks for a few seconds. “I can’t believe there would be anything left,”
he concludes. “I gotta be honest with you. It’s gonna be ashes.”

Apollo 12

Apollo 14 and 15 had no evidence from the images of the flags. It was thought they may have been destroyed by the exhaust gases on liftoff.

Apollo 16

Apollo 17

More Information

• https://www.hq.nasa.gov/alsj/ApolloFlags-Condition.html

share|improve this answer

edited Apr 17 at 18:40

answered Apr 17 at 5:30

gwallygwally

54133 silver badges88 bronze badges

$endgroup$

share|improve this answer

edited Apr 17 at 18:40

answered Apr 17 at 5:30

gwallygwally

54133 silver badges88 bronze badges

answered Apr 17 at 5:30

gwallygwally

54133 silver badges88 bronze badges

answered Apr 17 at 5:30

gwallygwally

54133 silver badges88 bronze badges

13

$begingroup$

A flag would be about five hundred micro arcseconds. (about 1 meter, at around 375 Mm)

The Event Horizon Telescope has a resolution of about 20 micro arcseconds.

Therefore, EHT could resolve a flag on the surface of the moon if it were a radio source.

However, to view it optically would require around a 350 meter aperture. The largest 'single' telescope today is around 10 meters

The Cambridge Optical Aperture Synthesis Telescope (COAST) - the largest I'm aware of - can resolve to around 1000 micro arcseconds, so wouldn't be able to see a flag.

share|improve this answer

edited Apr 17 at 11:05

answered Apr 17 at 9:01

JCRMJCRM

4,35522 gold badges1313 silver badges3636 bronze badges

$endgroup$

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  oops, previous answer was out by a $10^3$, changing the outcome.
  $endgroup$
  – JCRM
  Apr 17 at 9:02
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  hope it's not offtopic but would it be possible to couple optical telescopes in the same way the EHT did?
  $endgroup$
  – undefined
  Apr 17 at 9:58
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  That's largely what COAST does @undefined, except optically not analytically. To complicate things, one also needs to collect enough light to see it, so it would need a large collection surface, as well as aperture (even with long exposure times)
  $endgroup$
  – JCRM
  Apr 17 at 10:26
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  oh thank you, JCRM. I thought the COAST is only one large telescope and not many. Thank you :)
  $endgroup$
  – undefined
  Apr 17 at 10:30
  

  
  
  
  

add a comment
 | 

13

$begingroup$

A flag would be about five hundred micro arcseconds. (about 1 meter, at around 375 Mm)

The Event Horizon Telescope has a resolution of about 20 micro arcseconds.

Therefore, EHT could resolve a flag on the surface of the moon if it were a radio source.

However, to view it optically would require around a 350 meter aperture. The largest 'single' telescope today is around 10 meters

The Cambridge Optical Aperture Synthesis Telescope (COAST) - the largest I'm aware of - can resolve to around 1000 micro arcseconds, so wouldn't be able to see a flag.

share|improve this answer

edited Apr 17 at 11:05

answered Apr 17 at 9:01

JCRMJCRM

4,35522 gold badges1313 silver badges3636 bronze badges

$endgroup$

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  oops, previous answer was out by a $10^3$, changing the outcome.
  $endgroup$
  – JCRM
  Apr 17 at 9:02
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  hope it's not offtopic but would it be possible to couple optical telescopes in the same way the EHT did?
  $endgroup$
  – undefined
  Apr 17 at 9:58
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  That's largely what COAST does @undefined, except optically not analytically. To complicate things, one also needs to collect enough light to see it, so it would need a large collection surface, as well as aperture (even with long exposure times)
  $endgroup$
  – JCRM
  Apr 17 at 10:26
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  oh thank you, JCRM. I thought the COAST is only one large telescope and not many. Thank you :)
  $endgroup$
  – undefined
  Apr 17 at 10:30
  

  
  
  
  

add a comment
 | 

$begingroup$

A flag would be about five hundred micro arcseconds. (about 1 meter, at around 375 Mm)

The Event Horizon Telescope has a resolution of about 20 micro arcseconds.

Therefore, EHT could resolve a flag on the surface of the moon if it were a radio source.

However, to view it optically would require around a 350 meter aperture. The largest 'single' telescope today is around 10 meters

The Cambridge Optical Aperture Synthesis Telescope (COAST) - the largest I'm aware of - can resolve to around 1000 micro arcseconds, so wouldn't be able to see a flag.

share|improve this answer

edited Apr 17 at 11:05

answered Apr 17 at 9:01

JCRMJCRM

4,35522 gold badges1313 silver badges3636 bronze badges

$endgroup$

share|improve this answer

edited Apr 17 at 11:05

answered Apr 17 at 9:01

JCRMJCRM

4,35522 gold badges1313 silver badges3636 bronze badges

answered Apr 17 at 9:01

JCRMJCRM

4,35522 gold badges1313 silver badges3636 bronze badges

answered Apr 17 at 9:01

JCRMJCRM

4,35522 gold badges1313 silver badges3636 bronze badges