Space Exploration

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.


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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?

NASA's 10 Greatest Achievements

Since its inception in the late '50s, NASA has accomplished some amazing technical feats. But what are some of the agency's greatest moments?

NASA Inventions You Might Use Every Day

Although most people today will never set foot on the moon, it's likely you come into contact with a NASA byproduct every day.

Space Conspiracy Theory Pictures

The moon landing is just one of many sources of debate among space conspiracy theorists. This image gallery wades into the discussion on this theory and a few others.

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?

How Lunar Landings Work

People around the world watched as Neil Armstrong touched the moon and declared, "That's one small step for man; one giant leap for mankind." But how did we put a man on the moon?

What if an astronaut went on a space walk without wearing a space suit?

Because an Earth-like environment is created within a spacesuit, it allows you to walk around in space in relative safety. But outer space is an extremely hostile place and could kill you if you aren't protected.

How much food and water do you need for a one-year stay on Mars?

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?

Are we not the only Earth out there?

Not by a long shot, self-centered earthlings. So the question is, exactly how many Earth wannabes are cruising around the universe and what are they like?

Are we looking for aliens in the wrong places?

If you take cosmic dust and add plasma ... do you get life? Findings suggest that plasma crystals may be the key to one of the universe's greatest mysteries: Is there life out there?

How Lunar Liquid Mirror Telescopes Work

NASA's next generation of telescopes will collect 1,736 times more light than the Hubble and will penetrate the depths of the universe to see objects nearly as old as the Big Bang.

Manmade Universe Coming Soon?

Scientists might be able to create a universe in a laboratory. How is this possible?

How the Mars Exploration Rovers Work

Of course we want to go to Mars. Until we figure it out though, roving robots with names like Spirit, Opportunity, Sojourner and Curiosity are our best bet for digging up dirt on our nearest planetary neighbor. Want to go along for the ride?

How Planet Hunting Works

Don't worry. We still love you, Earth, but we've been wondering about the possibility of life on other worlds for centuries, and now we have the tools to do some exploring. What have astronomers found so far?

How SETI Works

SETI is the Search for Extraterrestrial Intelligence, and it's dedicated to discovering signals sent to Earth from far, far away. Find out what would happen if an extraterrestrial were to make contact.

How Mars Odyssey Works

Mars Odyssey is NASA's latest Mars spacecraft, and it's going to the red planet in search of water. Learn how this orbiter could pave the way for manned missions to Mars!

How Hubble Space Telescope Works

Since its launch in 1990, the Hubble Space Telescope has ranked as one of man's greatest achievements in space or otherwise. What does the future hold for the great observatory, and will its space telescope successor measure up to Hubble?

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.

Is there any way to see satellites that are in orbit?

Until its fiery landing in the Pacific Ocean in Mach 2001, the MIR space station was one of the largest objects orbiting the planet, so large that it was especially easy to see -- if you knew what you were looking for.

How Satellites Work

Thousands of satellites fly overhead every day, helping us with things like weather forecasts, scientific research, communications, TV broadcasts (and maybe some surreptitious spying). How much do you know about these eyes in the sky?

How do satellites orbit the Earth?

How do satellites orbit the earth? Why don't they fall straight to the ground like everything else?

How can I track the NASA's Starshine satellite?

How can I track the NASA's Starshine satellite?

Is it possible to see (with a telescope) the stuff left behind on the moon?

Is it possible to see (with a telescope) the stuff left behind on the moon by the Apollo astronauts to prove whether the missions were real?