- Jun 22 Wed 2011 21:08
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Myth buster --- 撞車測試
- Feb 04 Fri 2011 23:36
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三芝 雪霸 竹山 集集 行

過年放假啦,今年一樣是快到出遊的時候才回家…不過專題進度還是一樣QQ了…明天又要繼續趕工了Orz… 這次好像是要去六天五夜,三芝、雪霸、竹山、集集四個地方 以下要開始…流水帳XD 2011/1/30 早上好像睡太爽了XD… 出發好像已經十點多了…中間路程省略~
- Nov 24 Wed 2010 03:20
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幹...被詐騙了
- Jul 22 Thu 2010 02:06
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清大天文營--營期生活版
- Apr 04 Sun 2010 01:11
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春遊--阿里山+鹿林天文台+日月潭
- Dec 29 Tue 2009 22:00
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Revolution
- Nov 12 Thu 2009 03:22
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Basis of life

前幾天在嘴砲中突然出現了Span 和 Basis 這兩個字 (雖然很多地方是用錯了XD 因為應該一次只能在一個Basis下 只是可以有很多Vector) 大一閒閒的都會覺得時間無限 可以無限的榨取 但是到了大二覺得自己的意志力還不太夠 前幾天都只睡四小時到了昨天就掛點了
- Nov 03 Tue 2009 01:40
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天文攝影
- Oct 30 Fri 2009 18:39
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Asteroid exploded over Indonesia weeks ago
轉錄自http://blogs.discovermagazine.com/badastronomy/2009/10/27/asteroid-exploded-over-indonesia-weeks-ago/
I am just now hearing about an asteroid estimated to be about 10 meters across blowing up over Indonesia on October 8. Apparently no one was injured. I have no clue how I missed this, but The Telegraph has the story. This is not an everyday occurrence, but 10 meter rocks probably do come in and explode high over the Earth’s surface every few years or so. If they’re rock they won’t make it to the ground; instead they blow up due to the incredible force of their passage through the air (in this case, the explosive yield was about 50 kilotons of TNT). Smaller rocks will rain down, though.
If it’s metal, that would be worse. It might withstand the aerodynamic pressure and hit intact. However, like I said, this is pretty rare.
The newspaper article above plays up the "What if it were just a bit bigger?" aspect, which is true enough, but what can we do? A rock or chunk of metal 30 or so meters across is dangerous, sure, but is too small to see very far out, so there’s not much we can do about it. That’s not exactly great news. It’s possible it might get spotted a day or two in advance — we’ve seen smaller ones with a day’s warning — but most likely our first warning would be the flash in the sky.

