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Could I see a flashlight beam from Earth on the moon?

science.howstuffworks.com/question441.htm

If I was on the moon and the earth was black (no lights were on) and a flashlight was turned on facing the moon, would I see the light? If I couldn't, would there be any way to detect any residual matter that came from the light on Earth or does light die after a certain distance?

Could Our Spacecraft Accidentally Ignite an Alien World's Entire Atmosphere?

science.howstuffworks.com/rockets-accidentally-ignite-alien-world-atmosphere.htm

Outer planets in our solar system have atmospheres made up of flammable chemicals that can cause explosions on Earth. Could a rocketship, or electric spark, ignite them?

Could Planting 1 Trillion Trees Counteract Climate Change?

science.howstuffworks.com/environmental/conservation/issues/planting-trillion-trees.htm

Many scientists say that the response to climate change will require planting new trees. A whole lot of them.

Could Thorium Power the Next Generation of Nuclear Reactors?

science.howstuffworks.com/thorium.htm

Thorium is in many ways safer than uranium for nuclear power production. But is it safe enough to bet on for our energy future?

Could We Build Our Own Gundams?

science.howstuffworks.com/could-build-own-gundams.htm

Well, heck yeah, we can, and we have. Let's take a look.

Could You Dig a Tunnel Right Through the Center of Earth?

science.howstuffworks.com/environmental/earth/geophysics/question373.htm

Let's say you have a lunch date to make - and it's on the other side of the planet. Wouldn't it be convenient to pop down a hole through Earth's innards? But what would really happen if you did?

Could a gamma-ray burst wipe out all life on Earth?

science.howstuffworks.com/gamma-ray-burst-life-earth.htm

When a huge star collapses, it releases massive amounts of radiation in concentrated streams. If one of those streams hit Earth, it wouldn't be pretty. But where should we put "gamma-ray bursts" on our list of anxieties?

Could a planet exist without a host star?

science.howstuffworks.com/planet-exist-without-host-star.htm

It's not uncommon for planets to wander alone through the universe like big, sullen teenagers. But how do they end up flying solo, and could they still harbor life?

Could a single volcanic eruption destroy all life on Earth?

science.howstuffworks.com/nature/natural-disasters/single-volcanic-eruption-destroy-all-life.htm

The question about supervolcanoes, it turns out, isn't whether one could destroy all life on Earth. It's when will it do it again. Wait, what?

Could an extremely powerful solar flare destroy all the electronics on Earth?

science.howstuffworks.com/solar-flare-electronics.htm

Solar flares and their effect on electronics are explained in this article. Learn about solar flares.

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