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Every single satellite orbiting the Earth

This is Our Planet by Tomislav Safundžić. Image courtesy of the Image Science & Analysis Laboratory, NASA Johnson Space Center

A supernova remnant, Cassiopeia A, also called Cas A, approximately 11,000 light years from Earth. It is the strongest radio source in the sky and is believed to be the result of a supernova that could have been first seen on Earth approximately 340 years ago. Learn more about neutron stars:

Caves Photography by Kent Mearig