space exploration library

Space exploration is a broad topic covering many facets of deep-space and planetary science. Learn about space probes, Mars Rovers, SETI and other out-of-this-world subjects.

Featured Article: Are we not the only Earth out there?

In science fiction, explorers often investigate Earthlike planets. In reality, such perfect, life-giving worlds are rare. But scientists may have found one. See more »

Articles 21-28 of 28

What if I went to Mars for a year to study the planet, how much food and water would I have to take with me to survive?

If you spent a year on Mars, you would need to take more food and water than you could possibly carry. But if you had to go, how much would be enough?

Why do some people believe the moon landings were a hoax?

It was a small step for a man, a giant leap for mankind. But some people say that the moon landings never happened at all. Why all the conspiracy theories?

Why is NASA seeking out the MySpace generation?

Has space camp gone out of style? NASA's going after the MySpace generation with a new Web site design and strategy, but why?

How are the Voyager spacecraft able to transmit radio messages so far?

The Voyager spacecraft use 23-watt radios. This is higher than the 3 watts a typical cell phone uses, but in the grand scheme of things it is still a low-power transmitter. The key to receiving the signals is therefore not the power of the radio, but a combination of three other things.