This list includes:
Herbig-Haro 49/50: Streams of matter erupting from a young star during its formation.
Eagle Nebula: A massive gas "pillar" 9.5 light-years long, towering in space.
Einstein Ring: An illusion created by the bending of light by gravity – a cosmic mirage.
Cassiopeia A: Debris from a supernova explosion recorded in the late 17th century. 
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