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Colonizing Mars: Comparing the Facts and the Fiction

Here’s how the most popular of today’s Mars-set science fiction stories line up with today’s science.

The Voyager Golden Record: Humanity's Message to the Stars

In 1976, NASA and a crack team led by Carl Sagan had a message for aliens — and the people of Earth.

Will We Have Space Tourism in Our Lifetime?

A modern-day space race between private companies is heating up to send humans into deep space.