Nova in Scorpius,July 2005
Numéro d’image : 11886045
| Nova in Scorpius. The position of this nova,1737-34 Nova Scorpii 1,is shown by the cross- hairs. A nova is a huge brightening of a double star system,which makes a previously unseen star visible for a short time. It occurs when one star is a small,dense white dwarf and the other is much larger. The white dwarf accretes hydrogen gas from the larger star onto its surface. Once a specific amount of hydrogen has accreted,it becomes dense enough for nuclear reactions to begin,and it ignites. This blows away the remaining gas layers,so the brightening is short- lived,usually only lasting a few days. This nova was discovered on 25th July 2005 | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Sanford, John |
| Taille de l’image : | 2696 px × 3400 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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