Amateur astrophotographs posted online represent a massive untapped resource. Now astronomers have worked out how to mine it
For a short time back in October 2007, Comet 17P/Holmes became the largest object in the Solar System as the thin ball of dust and gas that surrounds it briefly became larger than the Sun. At the same time, Holmes brightened by a factor of half a million, making it visible to the naked eye. (All this activity seems to have been caused by a sudden outburst of gas from the comet's nucleus.)
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