Also visible are Antares , the bright orange star in the upper right, Arcturus , the bright star on the lower left, and the Pipe Nebula , which is perhaps harder to find. Comet Hyakutake 's unusually close approach to the Earth allowed astronomers to learn many things, including that comets can emit much X-ray light . Comets are cosmic icebergs . They follow very elongated orbits which carry them from the frozen, remote outer reaches of the Solar System to close encounters with the Sun . Blown by the solar wind, comet tails generally point away from the Sun.
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