Centaur discovered he was lurking deep in the solar system Science… – AlKhaleej Today

Astronomers, astronomically speaking, are space rocks that have the properties of asteroids and comets. It is believed that they came from beyond the orbit of Neptune and traveled inward to the sun.
They rummaged in the solar system for millions of years and were responsible for the late heavy bombardment about 3.8 billion years ago when asteroids rained on Earth. They share the same rocky body of an asteroid while releasing gas and vapor known as a coma throughout their history, much like a comet….

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