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Surprise meteor, Hubble service mission update and China’s lunar probe March 2, 2009

Posted by Mike Trudeau in Astronomy, Nasa, Space.
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Woah! What the hell was that? A totally unexpected asteroid sped by on Monday between the Earth and the Moon. It’s travelling at twenty kilometres per second and is between 60 and 100 metres wide. Apparently that’s nothing new, and a lot of asteroids zip by unnoticed. I find that a little unnerving.
The difference between an asteroid and a comet (like the comet Lulin that passed by last week) is in their appearance. Comets have a visible tail (or coma) and asteroids do not. A comet’s tail is water vapour and dust particles that have blown off the body of the comet as it gets close to the sun.
A meteoroid is smaller than an asteroid (and according to the official definition, bigger than an atom). It becomes a meteor when it enters a planet’s atmosphere and becomes visible as a bright streak. Any material from a meteor that makes it to the ground becomes a meteorite.

In other news it looks like the upcoming service mission to the Hubble space telescope will get the go-ahead after all. After the recent satellite collision there had to be some weighing of the risks. If the mission succeeds it would make the Hubble much more powerful and extend its life considerably.

Finally, China’s Chang 1 lunar satellite concluded its mission of mapping the surface of the moon by slamming into the moon in a “controlled collision.” Although it only became the third country to send a person into space recently, it looks like China is pursuing its space program ambitiously, with plans for a space station and manned lunar mission in the works as well.

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