The green line that seems to cross in front of the Andromeda galaxy is a "meteor." This photo was captured while photographing the Andromeda galaxy during the peak of the Perseid meteor shower in 2016. It took less than 1 second for this meteor to leave such a trail. As the meteor enters Earth's atmosphere, it burns intensely, emitting a green light as the gas evaporates. This year, the Perseid meteor shower can be observed next week. However, it may be difficult to see due to the full moon.
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