Habitable alien planet. Computer artwork of an Earth-like alien planet (upper centre). A planet's orbit and its size have to fit within a narrow range in order to have a surface temperature suitable for liquid water,and to retain an atmosphere. The number of other habitable planets in the Milky Way is not known,but has been estimated at anything between 1 (just Earth) and as many as 10 billion | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Van Ravenswaay, Detlev |
Taille de l’image : | 3806 px × 5008 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |