Andromeda Galaxy core stars,artwork. Two groups of stars are thought to exist at the core of the Andromeda Galaxy (M31). A larger group of older,redder population of stars is typical of those found in galactic cores. A smaller group of young,blue stars is thought to form a disk as they orbit a supermassive black hole (upper right). Observations by the Hubble Space Telescope (HST) indicate that 400 of these young blue stars formed about 200 million years ago,forming a disk that is only one light year across,with orbital speeds of 1000 kilometres a second. Artwork published in 2005 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / A. FEILD / STSCI / ESA / NASA |
Taille de l’image : | 2882 px × 3059 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |