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For those using a HTPC with a projector you have to try this two freewares.

I read about Celestia in a post from the "Less than $5,000 projector forum" and later I found Orbiter. Descriptions from their web sites follows:


Celestia [ http://ennui.shatters.net/celestia/ ]


Celestia is a free real-time space simulation that lets you experience our universe in three dimensions. Unlike most planetarium software, Celestia doesn't confine you to the surface of the Earth. You can travel throughout the solar system, to any of over 100,000 stars, or even beyond the galaxy. All travel in Celestia is seamless; the exponential zoom feature lets you explore space across a huge range of scales, from galaxy clusters down to spacecraft only a few meters across. A 'point-and-goto' interface makes it simple to navigate through the universe to the object you want to visit.


Orbiter [ http://www.medphys.ucl.ac.uk/~martins/orbit/orbit.html ]


ORBITER is a realistic space simulation using proper physics for the modelling of planetary motion, gravitational fields, free space and atmospheric flight etc. As such, it is more challenging to master than an arcade game - you should at least have some basic idea about mechanics and planetary motion to get the most from it. (A good intro can be found at JPL's Space Flight Learners' Workbook)



I'm using them with my "almost complete HTPC" and the Panny 75U projector. On a big screen they are awesome!!!


Give them a try, you have nothing to loose, they are free!!!
 
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