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Halley's Comet
Where's Halley's Comet now?
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It is almost directly opposite and the same disance away from Earth as Neptune. It is 28.4 astrononical units (AU) away from Earth (1 AU = 149,597,870.691 km). It is about 5/6 of its furthest point from Earth.
If you are interested in things like this you should download Celestia, it's where I got the above info from.
http://www.shatters.net/celestia/
(The site is down at the mo but there is a download link)
It's open source and completely free and is an excellent model of the known universe, you can view many different objects at any time past, present or future and has too many features to list here. You do need a high end PC to run it though.
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