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>>2萬光年外的影像代表著它是兩萬年前的影像,我們落後了兩萬年:"(光年是距離，不是時間，以光速每秒30萬公里計算的話一光年等於一天:86400秒(一天)*30萬公里=25920000000公里一光年=9.4608*10 (12次方)公里20000光年=1.89216*10(17次方)公里
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Reader Comments (Page 1 of 1)
Murphy @ Apr 12th 2008 1:40AM
>>2萬光年外的影像代表著它是兩萬年前的影像,我們落後了兩萬年:"(
光年是距離，不是時間，以光速每秒30萬公里計算的話一光年等於
一天:86400秒(一天)*30萬公里=25920000000公里
一光年=9.4608*10 (12次方)公里
20000光年=1.89216*10(17次方)公里