Top news for December 21, 2008

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On This Day In Space: May 25, 2008: NASA's Phoenix spacecraft lands on Mars

Northern lights (aurora borealis): What they are & how to see them

Northern Lights: What are the aurorae borealis?

This Week In Space podcast: Episode 72 — Newspace Careers with Rick Jenet

What is the Kardashev Scale?

Searching for Planet Nine: What Is Lurking in the Outer Reaches of Our Solar System?

'The international astronauts would be professional': Nebraska's astronaut on Russian invasion of Ukraine

Why Werner Herzog thinks human space colonization “will inevitably fail”

Study Untangles Mitochondria – The Energy Powerhouse of Our Cells – To Reap Rewards of Exercise

The Touching Reason Prehistoric People May Have Collected And Reused Old Tools