Stars indicate closer matches.

Cygnus X-3
Central compact object
Astrophysical X-ray source
Ultraluminous X-ray source
Super soft X-ray source
X-ray background
G 117-B15A
GRS 1124-683
Hercules X-1
Messier 15
MS 0735.6+7421
NGC 4151
X-ray astronomy
Puppis A
Crab Nebula
IC 443
Simeis 147
Veil Nebula
Cygnus OB2-8A
WR 147
Crescent Nebula
IC 5146
North America Nebula
Sh2-101
Sh2-106
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