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

All asteroids and comets visited by spacecraft as of August 2014, in color, albedo linearly scaled

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.

Asteroid 253 Mathilde in color

Planetary Society Advent Calendar for December 2: Mathilde

253 Mathilde is the largest asteroid that has ever been visited by a spacecraft. It's held that distinction for more than twelve years, but next year it'll be upstaged by the considerably larger 21 Lutetia, which Rosetta will fly by on July 10.