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Originally Posted by Chocaholic
-No tail
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It has a tail.
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-Light appears to be self generated
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What? No
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-Almost pure nickel with no iron
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Well, that's quite the assumption. There hasn't been any iron vapor spectrally seen yet. Could be that it is iron deficient, could be that the iron is still encapsulated. We've never really studied a primordial comet, and this one in particular might be VERY old, so it might be iron poor from the beginning. Also, billions of years in interstellar space might do strange things to the chemistry inside. All of our comets are (a) from the same dust cloud and therefore look and act the same, and (b) are protected by the Sun's heliosphere, which protects us from some of the nasty cosmic rays in interstellar space.
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-Suspiciously accurate path through our solar system
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What, a straight line? Holy cow, we better not have any straight lines around here, that's suspicious!
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-Absolutely massive and many times larger than a comet should be
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They don't even know how massive it is, but a few miles across puts it well into the "normal to small" range, not the "absolutely massive" range. "Absolutely massive" is 40+ miles across, not 4 miles across.