Supernova remnant Cassiopeia A. This is the remains of a star that exploded 325 years ago. When a large star dies,gas shells explode outwards and collide with interstellar material. The energy of the collision ionises the gas,causing it to glow. Cassiopeia A lies around 10,000 light years from Earth in the constellation Cassiopeia. Different colours represent different ionised gases; sulphur is red,hydrogen is green and oxygen is blue | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / J-P METSAVAINIO |
Taille de l’image : | 5138 px × 3401 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |