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Planetary Society Advent Calendar for December 5: Epimetheus

Emily Lakdawalla • December 05, 2009

Epimetheus is one of the many small moons of Saturn that are referred to by the Cassini mission team as "rocks" though they are probably mostly made of ice, not rock.

Planetary Society Advent Calendar for December 4: Mercury

Emily Lakdawalla • December 04, 2009

Mercury is the smallest of the eight planets and, like Uranus and Neptune, has so far been studied only during flyby encounters.

Planetary Society Advent Calendar for December 3: Europa

Emily Lakdawalla • December 03, 2009

From a distance, Jupiter's fourth largest moon Europa is the smoothest object in the solar system; its outline traces out a perfect circle.

If Earth had rings

Emily Lakdawalla • December 03, 2009

I am the very last space blogger in the universe to post about this video, but that doesn't make it any less cool.

Planetary Society Advent Calendar for December 2: Mathilde

Emily Lakdawalla • December 02, 2009

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.

The November/December issue of The Planetary Report is out

Emily Lakdawalla • December 02, 2009

Members of The Planetary Society, you should now be receiving your November/December issue of The Planetary Report in the mail.

Planetary Society Advent Calendar for December 1: Dione

Emily Lakdawalla • December 01, 2009

I've always loved advent calendars and the way they both managed and heightened my anticipation of the gift-opening frenzy of Christmas morning.

Dawn Journal: In the Asteroid Belt, but Far from Asteroids

Marc Rayman • December 01, 2009

Dawn entered the main asteroid belt on November 13. As it ventures ever deeper into this vast collection of material between Mars and Jupiter, it may be tempting to think of the spacecraft constantly dodging asteroids.

What's up in the solar system in December 2009

Emily Lakdawalla • November 30, 2009

The two big things happening this month are the launch of the Wide-field Infrared Survey Explorer (WISE), from Vandenberg Air Force Base no earlier than December 9 at 06:09 PST (15:09 UTC), and the December meeting of the American Geophysical Union (AGU) from the 14th through the 18th.

Spectacular animation of Halley's comet

Emily Lakdawalla • November 26, 2009

It's a holiday and I'm enjoying time with the family, so rather than write a lot, I will let a spectacular image do the talking for me.

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