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Comed - Wicipedia

Comed

Oddi ar Wicipedia

Comed Hale-Bopp (1997)
Comed Hale-Bopp (1997)

Corff nefol cynharol fychan sy'n cylchdroi o amgych yr haul mewn cylchdro eliptig yw Comed. Gall eu deunydd gynnwys creigiau, rhew a nwy; cyfeirir atynt weithiau fel "peli eira budur". Pan ddaw comed yn ddigon agos at yr haul, cynhesir ei deunydd ddigon i greu coma o nwyon o'i hamgylch, a gall hwn ymffurfio'n "gynffon" sydd bob amser yn pwyntio i ffwrdd oddi wrth yr haul, ac sy'n creu ffurf draddodiadol comed.

Gall cnewyllyn y gomed amrywio o un i 50 km ar draws, gyda'r coma yn ymestyn dros 100,000-1,000,000 km; pan ffurfir cynffon, gall ymestyn am filiynau lawer o gilomedrau.

Yn 1932 daeth Ernst Julius Öpik allan â'r ddamcaniaeth fod comedau yng Nghysawd yr Haul yn ymffurfio mewn cwml o lwch a mater arall y tu hwnt i gylchdro'r blaned gorrach Plwto. Enwir y cwmwl hwnnw yn Gwmwl Oort (neu Cwmwl Öpik-Oort). Ystyrir Gwregys Kuiper, rhanbarth ar ffurf disg tu hwnt i gylchdro Neifion rhyw 30-50 Unedau Seryddol o bellter oddi wrth yr Haul sy'n cynnwys llawer iawn o gyrff rhewllyd bychain, fel tarddle comedau cyfnod byr.

[golygu] Comedau enwog

  • Comed 1P/Halley
  • Comed 2P/Encke
  • Komeet 9P/Tempel 1
  • Comed 17P/Holmes
  • Comed 19/P Borrelly
  • Comed 73P/Schwassmann-Wachmann
  • Comed 109P/Swift-Tuttle
  • Comed Arend-Roland
  • Comed Ikeya-Seki
  • Comed Kohoutek
  • Komeet Shoemaker-Levy 9
  • Comed Hyakutake
  • Comed Hale-Bopp
  • Comed Machholz
  • Comed McNaught
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