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Stories, updates, insights, and original analysis from The Planetary Society.

Best "Arsenic and Odd Life" coverage

Last night I asked via Twitter for recommendations for articles that did the best job explaining the significance of the work, by people who actually read the relevant paper in Science.

Door 3 in the 2010 advent calendar

Time to open the third door in the advent calendar. Until the New Year, I'll be opening a door onto a different landscape from somewhere in the solar system. Where in the solar system is this wispy terrain?

Door 2 in the 2010 advent calendar

Time to open the second door in the advent calendar. Until the New Year, I'll be opening a door onto a different landscape from somewhere in the solar system. Can you guess where this crater-scarred surface lies?

A few Mars Express Phobos goodies

To celebrate Mars Express' recent mission extension to 2014, here are some cool pictures that it took of Mars' inner and larger moon Phobos.

Deep Impact at Hartley 2: Two weeks after the flyby

Today the Deep Impact/EPOXI science team held a press briefing that followed up on their very successful flyby of two weeks ago, a status report on what they can say so far about the science that's coming out of the encounter.

Miscellany

The saddest item of business to note in this linky post is that noted astronomer Brian Marsden, retired director of the Minor Planet Center and a good friend to many, passed away yesterday at the age of 73.

Asteroids and comets to scale, including Hartley 2

Just in time for today's Deep Impact press briefing, which you can watch on NASA TV in a few minutes: I've updated my montage of all the asteroids and comets that have been visited and photographed to include Hartley 2.

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