Messier 55 is a globular cluster in the constellation of Sagittarius, located 17.600 light-years away. Being discovered by Nicolas Louis de Lacaille in 1752 from South Africa, this clus...
A faint bubble shape supernova remnant (a.k.a SNR G116.9+02) in Cassiopeia ~7500-10000 years old and ~9500 ly away. A mixed-morphology supernova remnant with its shell visible in both o...