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DPS 2012, Day 5: How to make asteroids crunchy on the outside and soft in the middle

Emily Lakdawalla • October 19, 2012 • 2

A summary of just one talk from the Division for Planetary Sciences meeting, by Lindy Elkins-Tanton, which provided a neat explanation for how asteroids can be melted and layered on the inside yet have a primitive-looking exterior.

DPS 2012, Monday: Icy moons and a four-star exoplanet

Emily Lakdawalla • October 15, 2012 • 1

In the first full day of the annual meeting of the Division of Planetary Sciences of the American Astronomical Society, I listened to scientific sessions on icy worlds and on an exoplanet in a four-star system.

Daphnis cruises through the Keeler Gap

Jason Davis • August 16, 2012

A recent series of ring images by the Cassini spacecraft reveal Saturn's tiny moon Daphnis cruising through the Keeler Gap.

Methone, an egg in Saturn orbit?

Emily Lakdawalla • May 21, 2012 • 8

Cassini obtained its first high-resolution images of Methone on May 20, 2012. Methone is one of the smallest regular moons of Saturn, having a diameter of only about 3 kilometers. It was the first moon that Cassini discovered, very early in Cassini's mission at Saturn, in 2004.

Ski Helene?

Emily Lakdawalla • April 20, 2012 • 2

I enthused about these Helene images the first time they came down from Cassini, and then forgot about them, and then was thrilled anew a couple of weeks ago when Daniel Macháček posted his version, processed from data published by the Cassini imaging team on April 1.

Pretty picture: Janus and Saturn

Emily Lakdawalla • April 04, 2012

In the last few days as it's rounded periapsis in its current orbit of Saturn, Cassini has taken a lot of great photos of Saturn's moons. One series of photos was taken from pretty close to Janus, a moon about a third the diameter of Enceladus that orbits between the F and G rings. And among those, several were taken with the moon sitting in front of Saturn.

Pretty picture: Saturn, a big moon, and a teeny one

Emily Lakdawalla • January 09, 2012

A recent view from Cassini of Saturn with its largest moon (Titan) and one of its small ringmoons, Prometheus.

Bill Nye and people
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