# You asked: Can you shine a flashlight in space?

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Essentially yes. Some of the photons will go all the way to the edge of the universe, taking many billions of years to get there. People seem to think that because a flashlight is not very bright all of it must get absorbed before it leaves the atmosphere.

## What would happen if you shine a flashlight in space?

The flashlight is emitting photons in one direction, and photons, even though they have a REST mass of zero, have momentum equal to hf/c where f is the photon frequency and h and c are constants. … That means it will accelerate, just as a rocket accelerates opposite to the momentum of hot gases expelled.

## Do flashlights work in outer space?

Yes, and flashlights work quite well in vacuum and space. There’s no air to absorb their light. Flashlights are common on US space suits, as shown in the picture below. Lights are also mounted on spacecraft, like the navigation lights of the SpaceX Dragon Capsule.

## Can you propel yourself in space with a flashlight?

Photons, the particles of light, have no mass, but paradoxically, they do still have momentum. The momentum of a photon is inversely proportional to its wavelength. … So yes, in principle, you can propel a spacecraft by shooting a powerful light out the back.

## Can you shine a light on the moon?

The typical red laser pointer is about 5 milliwatts, and a good one has a tight enough beam to actually hit the Moon—though it’d be spread out over a large fraction of the surface when it got there. … Sunlight bathes the Moon in a bit over a kilowatt of energy per square meter.

## Would throwing something in space propel you?

Yes. For two reasons. When you throw something, there is a force exerted on you just like you exert a force on the object you throw. Momentum is conserved, so whatever momentum you give to the object you throw in one direction, you gain from the object in the opposite direction.

## What happens if you turn on a flashlight at the speed of light?

The light from that flashlight would be moving at the speed of light (toward the earth). The speed of that light remains fixed, but since it is moving away at an incredible speed, the frequency of the light is lower, making the colors “red shifted”.

## Do flashlights travel at the speed of light?

The short answer is that light coming out of your torch instantly reaches the speed of light. Light can only ever travel at the speed of light — 300,000,000 metres per second in a vacuum, and a bit slower in air because it bumps into molecules.

## How far can a torch shine?

The Brightness of a 1000 Lumen Flashlight

A 1000 lumen flashlight is quite bright and, depending on the lens or reflector design, powerful enough to reach a distance of 200 meters or more. This type of flashlight allows you to see objects from a far distance.

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## Are solar sails real?

Since the failed Cosmos 1 mission, solar sails have been successfully built and launched by the Japanese Aerospace Exploration Agency (JAXA) with their IKAROS spacecraft that first demonstrated controlled solar sailing, by NASA with their NanoSail-D spacecraft, and by The Planetary Society with our LightSail 1 …

## Can I shoot a laser at the moon?

For decades, scientists have measured the moon’s retreat by firing a laser at light-reflecting panels, known as retroreflectors, that were left on the lunar surface, and then timing the light’s round trip. But the moon’s five retroreflectors are old, and they’re now much less efficient at flinging back light.

## Can you point a laser to the moon?

Yes. More than half of the laser power coming from a laser pointer will make it to the surface of the moon.

## How long would it take a laser to reach the moon?

Originally Answered: How long does it take for a laser to reach the moon if a laser was pointed at the moon? Well, let’s see: The Moon is about 238,000 from the Earth and the speed of light is about 186,000 miles/second. So 238/186 = about 1.3 seconds (one way).

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