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Planetoid Sedna was discovered last year.

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Planetoid Sedna.
Planetoid Sedna was discovered last year.

Mars Rovers' contracts extended for a third time.

NASA has given Spirit and Opportunity up to another 18 months to continue rolling around the surface of Mars in search of evidence of past water. The rovers have already completed their primary 3-month missions, and then an additional 11 months of extensions. Both rovers are still in surprisingly good shape, and are approaching targets that would have initially been considered out of reach. Opportunity set a new driving record on March 20, completing 220 meters (722 feet) in a single day's drive.

Sedna probably doesn't have a moon.

When the planetoid Sedna was discovered last year, Astronomers noticed that it had a very slow rotation speed, only turning once every 20 days. One way to slow the rotation of a planet is through the interaction of a moon, but detailed observations of Sedna with Hubble failed to turn up any evidence of a satellite. New observations by Astronomers with the Harvard-Smithsonian Center for Astrophysics have revised Sedna's rotation speed to once every 10 hours, which is what you'd expect for an object this size. No Moon is necessary.

Cassini completes fourth Titan flyby.

NASA's Cassini spacecraft made another close pass of Titan, Saturn's largest moon, on March 31, delivering new images and data from this mysterious moon. Although Titan's northern hemisphere had been imaged by Cassini's radar instrument on a previous flyby, this time it was able to take optical and Infrared pictures that pierced through the moon's thick methane atmosphere. This composite image of four photographs was taken when Cassini was approximately 130,000 km (81,000 miles) away from Titan.

Light has been seen from the earliest stars.

Astronomers have used the Spitzer and Hubble space Telescopes to see some of the first stars that formed in the most distant Galaxies ever seen. These stars, located in Galaxies in the Fornax cluster, are about 13 billion light-years away - they emitted this light only a few hundred million years after the Big Bang. Even though they didn't have much time to form, these Galaxies already look quite old, which means that star formation must have got going very early on.

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