Stellarium – turn your computer into a planetarium

Stellarium along with Celestia is one of the most interesting piece of software for those interested in Astronomy. Those who like to visit the planetarium will possibly love this program, especially given the fact that it is free (licensed under GPL). It brings the power of a panetarium (minus the viewing area) to your computer. Given the kind of light pollution at night in urban areas, Stellarium serves as an exploration tool for Astronomy enthusiasts.
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Celestia – explore the universe

Celestia is a software which explore the universe in 3D, & it is free just like Stellarium. It takes you a step further than a planetarium like software, by not confining you to Earth. For Astronomy enthusiasts or for anyone for that matter, this can provide an out of this world experience. Like, for example, viewing the entire solar system, & watching the planets go round the sun, or following Halley’s comet as it orbits the sun.

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