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What are some components found in comets?

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Each comet consists of the following: 1) Nucleus, consisting of a stable, porous central mass of ice, gas, and dust. Generally, it will be between 1 - 10 km/0.6 – 6 miles in diameter. read more

In 2017, scientists found there may be seven times more big long-period comets than previously thought. Some comets, called sun-grazers, smash right into the sun or get so close that they break up and evaporate. Some researchers are also concerned that comets may pose a threat to Earth as well. read more

In August 2011, a report, based on NASA studies of meteorites found on Earth, was published suggesting DNA and RNA components (adenine, guanine, and related organic molecules) may have been formed on asteroids and comets. read more

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