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问题：HowmanyplanetsintheUniverse?IwanttoknowhowmanyplanetsintheUniverse.
答案：↓↓↓ 沈安东的回答： 网友采纳 AccordingtooneoftherecentNewScientist'sreport,thereareatleast23planetsinoursolarsyatem..Becauseplanetscannotemitlight...itishardforthescientiststodetecttheirexistances...Thoseplanetsarenormallylocatedbetween1000AUto10,000AUwheresunlightishardlyreached...Howeverscientistshaventfoundouthowmanyplanetsareintheuniverse.Formyownguesswillbemorethenabillion.查看原帖>> | 
