Also: Stardust mission, comet glycine
NASA's Stardust spacecraft caught dust from comet Wild 2 and returned it to Earth in 2006.
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Elsila and colleagues measured carbon isotopes and concluded that glycine in Stardust samples came from the comet, while another amino acid was Earth contamination from nylon.
As reported in: Elsila, Glavin, Dworkin (2009). Cometary glycine detected in samples returned by Stardust. Meteoritics & Planetary Science. doi:10.1111/j.1945-5100.2009.tb01224.x