At some point around the year 1837, an abnormal object passed at 1,000 AU from the Sun. (One Astronomical Unit, or AU, is the normal Earth-Sun distance.) For over a century, it proceeded undetected towards the Sun. At last, on October 19, 2017, we saw the guest. Illustration of Oumuamua Credit: Nasa Oumuamua is nothing like anything else in the solar system. Leaving to the side the properties of its orbit, which solidly nails it down as the interstellar invader it genuinely is, the thing is only an abnormal object. Oumuamua is a few hundred feet in length, yet exceptionally thin, shaped like a huge cigar. The item has a dull red tone to it, alike to the objects found in the far-off edges of our solar system, similar to Pluto . Study Done by Astronomers Astronomers expected the first interstellar guest would be a comet because they are brighter than space rocks, which makes them simpler to spot. In our nearby planet solar system — and probable others — approaching comets begin a l...
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