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to introduce some famous historical events to explain some traditional beliefs about comets to demonstrate the harm it has done to man to show its significance to human history
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some different comets appearing several times the same comet appearing at different time three different comets appearing three times several comets appearing at the same time
observably observing observe observable
has no solid form wanders like a frozen lump when it’s far out in space requires the warmth of the sun to survive is always followed by a long tail
They are great in number. Their arrivals used to frighten human beings. They are named after their discoverers. They are large mushy snowballs of frozen ices and gases.
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adopted acquired adapted accumulated
comets are the most commonly seen astronomical bodies comets, meteor fragments and the asteroids are mysterious not much is known about comets nothing do we know about comets except guesses
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