What is a Comet? – Astronomy – Space

By |2019-04-18T05:32:51-07:00August 17th, 2017|Physics|

A comet in the night sky What are comets made of? Comets are balls of leftover rock and ice in space. They started out when a star exploded into a supernova. What is a supernova? More about ice All our space articles When were the first comets? A nebula formed, and then most of the material in our nebula merged together, about [...]