Halley's Comet,photographed March 19,1986,showing plasma (lower) and dust (upper) tails. Halley is the only naked-eye comet certain to return within a human lifetime (every 75 year or so). It derives its name from Edmond Halley,an eighteenth-century astronomer who computed its orbit. The comet has been observed by astronomers since at least 240 BC | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Schad, Jerry |
Taille de l’image : | 3358 px × 2222 px |
Model Release : | Non requis |
Property Release : | Non requis |
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