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Types of comets, illustration 1668

Types of comets, illustration 1668

C041/5574

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Credit

LIBRARY OF CONGRESS / SCIENCE PHOTO LIBRARY LIBRARY OF CONGRESS / SCIENCE PHOTO LIBRARY

Caption

Types of comets. Illustration from Cometographia (1668), by the Polish astronomer Johannes Hevelius, showing different types of comets. Comets are bodies of rock and ice that orbit the Sun on elongated orbits lasting hundreds or thousands of years. When they pass into the inner solar system, the Sun heats them up and the ice melts, creating long tails of ice and dust that glow in the light from the Sun. Shown are the variations Hevelius had seen in the structure of cometary heads (nuclei) and tails.

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