How Long Does it take for light from the moon to reach the Earth ?

Question

How Long Does it take for light from the moon to reach the Earth ?

Answer 1

It takes about 1.3 seconds for reflected light from the Moon to reach the Earth.

Answer 2

Light travels at 186,282.4 miles per second, and it's about 238,000 miles to the moon, so about 1.3 seconds or so.  Telling someone on the surface "Hi", and waiting for an immediate answer takes about 3 seconds.

Longer if they speak with a drawl.....

Answer 3

1.3 seconds.

Answer 4

Light travels through space at just over 186,000 miles per second. The moon is just under 250,000 miles from Earth, so light from the Moon's surface has to travel more than one second (about 1.3 seconds) to reach us.

Among other things, the astronauts left reflecting mirrors on the moon. By shining a laser beam on those mirrors from Earth, and measuring the time (less than 3 seconds) it takes to see its reflection, the length of the round trip can be easily calculated to within a few inches!

If you've watched any of the videos of the moon landings, you might have noticed that the radio responses from the moon walking astronauts sometimes included a delayed echo of the questions. That also was a result of the 3 seconds it takes for a radio signal to travel to and from the moon, since radio waves are another form of light waves.

Since moonlight is reflected sunlight, it originates at the Sun's surface 93 million miles from the Earth/Moon system. It takes about 8 minutes for that trip, so the short, final hop from the Moon to the Earth is trivial by comparison.

Answer 5

As fast as light travels (?) LOL I dont know I just want those two points!!!

Answer 6

1.27 seconds

Answer 7

it would be around 1 second, I believe

Answer 8

1.3 seconds at 186,000 miles per second.

Answer 9

Just over one second.  The distance from Earth to Moon is 380,000 km, and the speed of light is 300,000 km/sec.