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Large, Distant Comets More Common Than Previously Thought
This animation portrays a comet as it approaches the inner solar system. Light from the Sun warms the comet core, an object so small it cannot be seen at this scale.
Credit: NASA/JPL-Caltech
Comets that take more than 200 years to make one revolution around the Sun are notoriously difficult to study.
From Jet Propulsion Laboratory/NASA
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