作者查詢 / springman
作者 springman 在 PTT [ sky ] 看板的留言(推文), 共44則
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3F推: 要看是多大的小行星吧。09/08 12:00
5F推: 小行星99942 好像曾被認為可能撞上地球09/09 20:29
6F→: 只是後來撞上的機率降到很低。09/09 20:30
14F推: 有些人說的 nibiru 好像是指 2003 UB313(鬩神星)08/27 14:25
1F→: 不過它的近日點比地球離太陽還遠,08/14 08:19
2F→: 或許只能觀察彗星本身的變化吧!08/14 08:19
2F推: 可能是看得到的範圍愈來愈廣吧!還是條件放寬呢?08/03 14:16
9F推: 小行星的前進速度不知多快,會到 30000km/sec 嗎?07/20 13:54
10F→: 這個速度大約光速的 1/10 吧!彗星撞行星時的速度07/20 13:55
11F→: 或許大約這個速度,只是不知普通小行星的速度多快。07/20 13:55
17F推: 謝謝。地球公轉速度好像大約 29.8km/sec。07/20 17:51
22F推: 謝謝 c大講解。07/21 06:20