M51造句
Explanation:OneofthebrightestsupernovasinrecentyearshasjustbeenrecordedinthenearbyWhirlpoolgalaxy(M51).Perhapstheoriginalspiralnebula,M51isalargegalaxy,over60,000light-yearsacross,withareadilyapparent...
Explanation:OneofthebrightestsupernovasinrecentyearshasjustbeenrecordedinthenearbyWhirlpoolgalaxy(M51).Perhapstheoriginalspiralnebula,M51isalargegalaxy,over60,000light-yearsacross,withareadilyapparent...