Potentially Hazardous Asteroids orbits. Computer illustration showing the orbits of all the known Potentially Hazardous Asteroids (PHAs),which number over 1400 (as of early 2013). These asteroids are considered hazardous because they are fairly large (at 140 metres in size),and follow orbits that pass close to the Earth's orbit (within 7.5 million kilometres) | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / JPL-Caltech / NASA |
Taille de l’image : | 3327 px × 2672 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |