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What is a Comet? – Astronomy – Space

By | 2017-10-16T22:57:26+00:00 August 17th, 2017|Physics|

A comet in the night sky Comets are balls of leftover rock and ice in space. They started out when a star exploded into a supernova.  A nebula formed, and then most of the material in our nebula merged together, about 4.5 billion years ago.. But these balls didn't join up with our planets. Instead, the comets kept on circling around the Sun on their [...]