Deneb (labeled "1" above) is Cygnus' best-known star and the first point of light when you locate the constellation from Cassiopeia ... it's around 2.5 million light-years away!

This image features a deep field view of the Cassiopeia constellation immersed in the ... leftover remnants from the last phase of a medium star like our sun. HFG1 features a prominent bluish ...