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M101 SPIRÁL GALAXIS (MESSIER 101, NGC 5457)
Az M101 spirálgalaxis, 21 millió fényévre található a Földtől, az Ursa Major (Nagy Göncöl) csillagképben. Pierre Méchain fedezte fel 1781-ben. Látszólagos fényessége 7.84 magnitúdó. A galaxis felfedezője úgy jellemezte, mint „csillag nélküli köd, nagyon homályos és elég nagy átmérőjű.
Az M101 átmérője 170 000 fényév. Összehasonlításképpen: a Tejút átmérője 87400 fényév. Körülbelül ezermilliárd csillaggal rendelkezik.
Forrás: Wikipedia
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