Mercury's moon. Artwork of the hypothetical moon of Mercury,with the planet in the sky. The moon's existence was suggested in 1974 when the Mariner 10 spacecraft detected bursts of Extreme Ultravio- let (EUV) light from an unidentified source as it neared Mercury. It was believed that the inter- stellar medium absorbed EUV,meaning that the emi- ssion source was nearby. The source was tracked,& it was found to be moving at 4 kilometres per second,a speed similar to that of a moon. The source was found to be star 31 Crateris. Although no moon was found,it had been discovered that EUV could penetrate the interstellar medium,giving astronomers a new way of observing the universe | |
Licence : | Droits gérés |
Crédit: | Science Photo Library |
Taille de l’image : | 5068 px × 3928 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |