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

Einstein still rules

News from 7.2 billion light years away demonstrates that some things in this shifting universe are relatively reliable.

Cassini RADAR continues to gaze at Titan

The Cassini spacecraft made its 59th flyby of Titan, Saturn's largest moon, on Friday, July 24, and in the last few hours we have received images from the RADAR instrument in SAR (Synthetic Aperture Radar) mode.

Gravity's Bow

Timothy Reed explains how optical telescopes are tested for gravity sag, and the methods used to counteract or compensate for it.

Aloha, Io

Taking a look at Jupiter's moon, Io, from Hawaii.

An Auspicious Week for Astronomy

On Monday, if all goes well, we will launch the Space Shuttle to rejuvenate one the greatest scientific missions launched on or off the Earth: the Hubble Space Telescope.

A pretty new Hubble image of Mars

A set of Mars image data taken by the Hubble Space Telescope a year ago was just released to Hubble's data archive. It was captured by Hubble's Wide Field and Planetary Camera 2 on January 30, 2008 when Mars was about 115 million kilometers from Earth.

Views of Tempel 1

It looks like the European Space Agency was busy overnight -- lots of great Earth- and space- based images of the impact have been appearing on various websites.

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