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) | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / JPL-Caltech / NASA |
Bildgröße: | 3327 px × 2672 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |