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What Are UFOs? Select Theories and Shifting Scientific Stances

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What are UFOs, and are UFOs real? Learn about UFOs in this article from HowStuffWorks.

Is there really water on Mars?

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Photographs have recently shown that there may be water on Mars. Find out if there's water on Mars and what that could mean for life on Mars.

How Comets Work

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Comets are remarkable pieces of our universe's past, and they tell us a great deal about how the universe was formed. Learn about the long but rewarding process of discovering and analyzing comets.

What If You Traveled Faster Than the Speed of Light?

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The speed of light is like that annoying friend who beats you at every game. What would happen if humans one day surpassed the cosmic speed limit?

Could we really blow up an incoming asteroid with a nuclear bomb?

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Surely nuclear weapons, which can obliterate entire cities, contain enough destructive power to blow a giant space rock to bits, right? What does NASA make of the whole explosive business?

Why We Need Artificial Gravity for Long Space Missions

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NASA and other agencies have been studying artificial gravity in hopes they will someday use it to help astronauts combat the effects of weightlessness in space. How close are we to that reality?

Space Exploration Pictures

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These space exploration pictures show you how mankind has explored the vastness of space. Check out these space exploration pictures.

Does the Real Element 115 Have a Connection With UFOs?

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For decades Bob Lazar talked about a mysterious element 115 that could power alien spacecraft. People thought he was nuts, but scientists discovered element 115 in 2003. What can that element do?

Top 10 Space Conspiracy Theories

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Space conspiracy theories feature hoaxes, government cover-ups and intelligent aliens. Check out our list of the top 10 space conspiracy theories.

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