Leave it up to the good ole Hubble Space Telescope. The workhorse telescope has given us a photo of the new interstellar comet 2I/Borisov. Take that, fancy new telescopes.
Comets contain a lot of water ice and other volatiles. When they get close enough to the Sun, some of that ice sublimates into gas, creating the characteristic coma and tail that is clear in many comet images. A coma and a tail are clearly visible in these Hubble images of 2I/Borisov. “Though another star system could be quite different from our own, the fact that the comet’s properties appear to be very similar to those of the solar system’s building blocks is very remarkable,” said Amaya Moro-Martin of the Space Telescope Science Institute, Baltimore, Maryland.
Amateur astronomers have discovered a lot of comets, and this one is no exception. Amateur astronomer Gennady Borisov, from Crimea, discovered this one on August 30th, 2019. More observations from other amateur astronomers followed Professional astronomers got involved too, and eventually the, which is still hypothetical at this point. So to have an interstellar comet come barging through our Solar System means we need to update our encyclopedias.
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