History's Mysteries (<a
href="http://www.historychannel.com/global/listings/listings.jsp?NetwCode=TH
C">History Channel
The Search for Life on Mars
Sunday, January 25 @ 11pm ET/PT

Throughout history, our planetary next-door neighbor Mars has captured our
imagination--from little green men to "man-made" canals and satellite photos revealing a giant "face". As 1 of the most likely spots in our solar system where some form of life may exist or have existed, we have spent billions on missions designed to disclose the red planet's tightly-held secrets. We'll trace man's journey of discovery of this fascinating planet, and focus on
NASA's great successes and heartbreaking failures. TV G

Deep Impact on CBS
Sunday, January 25 @ 9pm ET/PT

When scientists make the earth-shattering discovery that a 500-billion ton comet is on a collision course with our planet, a team of astronauts is assembled to undertake a desperate mission to deflect it before it causes an E.L.E. (Extinction Level Event) and ends life as we know it. In the months that follow, everyone in the world must struggle to find meaning in their lives in the face of looming catastrophe. (Elijah before Frodo)

and of course Enterprise & Smallville. You know where they are at if you're interested

Regards,
Mark