Will the real ET be little green men or little green bacteria? SETI Institute Senior Astronomer Seth Shostak theorizes what our first alien encounter might be like.
Iron meteorites are particularly sensitive to even the slightest bit of moisture - including the touch of a finger. James Williams pokes around for the reasons why.
After a three-billion mile journey into the outer reaches of the solar system, the Stardust spacecraft has landed at it's permanent home. Dave Mosher brings us up to speed. Kasey-Dee Gardner produces.
Edwin Hubble determines the distance to many nearby galaxies and discovers that the farther they are from us, the faster they are flying away from us. His calculations prove that the universe is expanding.
Watch where you step! Prehistoric poop is easy to find if you know where to look. James Williams sniffs out the details on what it can tell us about who left it.
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