Halley's comet photographed from New Zealand in October 1986. The Moon is behind cloud at bottom right. Named after Edmund Halley (1656-1742),who first recognised its periodicity,the comet has been recorded every 76 years since 240 BC. It consists of a nucleus of ice & dust,shaped like an elongated potato. Its tail is formed as the comet is heated when it approaches the Sun. Dust & gas are released and swept into a tail both by radiation pressure and by the solar wind | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Magrath, Barney |
Bildgröße: | 5024 px × 3936 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |