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Unformatted text preview: Coma Gas and dust pouring out from the nucleus forms a huge atmosphere around the nucleus. This is the bright core, called a coma , you can see when you observe a comet from the Earth. It is 100,000's of kilometers across. Because the nucleus has such low gravity (you could jump off it!), it cannot hang onto the escaping dust and gas. NASA's StarDust mission captured material from Comet Wild's coma in early Janurary 2004 and returned the microscopic dust grains embedded in aerogel to Earth in mid-January 2006. It found that Comet Wild like Comet Tempel is also made of a mixture of materials with high and low melting temperatures. This may be the result of material originally forming near the Sun that got ejected to the outer parts of the solar system nebula via the bipolar jets we see in many young, forming stars . Further analysis of the Comet Wild material has uncovered Glycine , an amino acid....
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