GALAXIES A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site IC 10 IC 10. Credit: Adam Block/NOAO/AURA/NSF A nearby dwarf irregular galaxy that is home to the most massive known stellar black hole – IC 10 X-1. IC 10 lies approximately 1.8 million light-years away in the constellation Cassiopeia. It is the only known starburst galaxy in the Local Group and is particularly rich in Wolf-Rayet stars, one of which is the companion of IC 10 X-1. IC 10 was discovered by Lewis Swift in 1889 but not suspected of being extragalactic until the 1930s. visual magnitude 10.4 angular size 6.8' × 5.9' position R.A. 00h 20m 17.3s, Dec. +59° 18' 14" other designations UGC 192, PGC 1305 Related category    • GALAXIES Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP