October 20, 2017

28.01.10: A Key Organic Compound Found in Space.

The Stardust aerogel detector. (Credit: NASA/JPL).

The Stardust aerogel detector. (Credit: NASA/JPL).


Stardusters rejoice; one of the largest citizen scientist projects has borne fruit. In 2004, NASA’s Stardust spacecraft passed through the outer envelope of comet Wild 2, allowing its sticky aerogel detectors to capture samples of gas and dust. Ever since the detectors parachuted safely to Earth on January 15, 2006, scientists, bloggers, and school kids have been pouring over the aerogel microscope scans looking for tell-tale dust tracks in a project known as Stardust@home, a vast citizen science project that might well be dubbed as the greatest science project done before bedtime.  Scientists at Goddard Space Flight Center announced late in 2009 that the molecule glycine has been detected in the aerogel detector. A key amino acid used in the construction of proteins, glycine is represented by the formula NH2CH2COOH. Scientists actually detected the molecules trapped in the foils at the rim of the detectors. Terrestrial glycine was ruled out due to the isotopic structure of the carbon atoms seen; Earth bound carbon tends to be of the Carbon 12 variety, while the glycine in the sample is the heavier Carbon 13, just what would be expected if the compound had come from the nucleus of a comet. It should be pointed out that the discovery of organic compounds is not the same as the discovery of life, but rather the key building blocks of such. This does, however, provide evidence that the raw materials to get life going may indeed be prevalent in the cosmos.


  1. [...] from Comet 81P/Wild returned by NASA’s Stardust mission suggest that elements originating from the interior of the early solar nebula — particularly [...]

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