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Revisiting Comet Halley
2012-11-26 10:52:46

ESA Comet Halley, the originator of the Orionids meteor shower that lit up our skies last month — as they do every October — is seen here up close by ESA´s Giotto probe as it flew past the famous comet on 13—14 March 1986. Giotto was ESA´s first deep-space mission. It swept within 600 km of Halley, obtaining the first close-up images of a comet. Comets are considered to be the primitive building blocks of the Solar System and likely helped to...


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6_348877a21702e82deaef967e7029f7ad2
2004-10-19 04:45:41

Comet -- A comet is a small body from the outer reaches of the solar system similar to an asteroid but composed of ice. Often described as "dirty snowballs," they are composed largely of carbon dioxide ice, methane ice, and water ice with a mixture of dust and small stony aggregates mixed in. Comets are thought to be small pieces of debris left over from the formation of the solar system, representing a sample of the original composition of the nebula that condensed to form the Sun and all...

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Word of the Day
ramage
  • Boughs or branches.
  • Warbling of birds in trees.
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