香港天文論壇

好勁. 你記得邊個同你同屆~ 我當年係唔記得邊個同我同屆的.... 每次上堂只顧自己磨磨磨..... 所以淨係記得磨得最好的 sophie (因為成日搵佢塊鏡做 demo?), 同埋少爺 (因為佢打爛左塊鏡???) 甚至宜家提起我先記得 wenxp 係我同屆.... (唔好意思呀鼠盟主~~) [臉紅紅] ======================================= 198x jj12667 1987 XR250 2000 Wah! SMC 2001 豆豸苗 WenXP 2003 layanata (係咪呢?) sodium (同lalalala同一年) 2004 marti...

O2- + H2O --->2OH-
O2- is very unstable in aqueous form, due to the high charge density.

好通透~~ 打算怎樣鍍法? Dear Mr. Panda, Originally the mirror is planed to be silvered. We have bought 1 kg of silver nitrate in order to to finish this job. Not until recently we have discovered that there exists a firm in mainland who is able to help to aluminize the mirror. The firm has a very large vacuu...

完全係嚇死....靚到


勁靚

只係一舊冰~haha

似唔似一塊鏡胚呢~~?

突然之間諗到, 假設一隻螞蟻生活響一個球體上, 咁響佢眼中佢o既世界就係一個2維空間, 其實o個個2維空間, 就係3維空間o既一部份(球體o既表面就o係球體之上), 咁我地依家o既3維空間, 會唔會就係4維空間o既一部份?

我地可以創造一個2度空間,eg.創造一個球體就等如創造一個2維空間(佢o既表面係一個2維空間 )(唔知o岩唔o岩 )咁創造一個3維空間o既"造物主"咪就係4維空間o既生物?!

我有個問題呀...好似話big bang之前成個宇宙係縮到得一點咁細, 咁o個一點之外又係D咩唻ga?

我響半年之前將一個兩毫子放左落去一個密封o既容器裡面(余仁生白鳳丸 ), 加左濃鹽水(sure係concetrated!!), 放埋一二邊睇下會有咩變化, 點知自己唔記得左... 放左好耐, 到最近執野先執番出唻. 我發現一個好奇怪o既現象, D水變左淡藍色. D藍色會唔會係Copper(II) ion?!照計鹽水同銅應該冇reation ga! 定係D藍色係其他野?!

指教指教!!

佢做緊乜ga?

扒飯撈麵 寫: 無人肯定
依家好多太陽系外的行星是很大(氣體,大係指mass)
但好近恆星

可能見到o個D比較後生, 粒行星D氣體未被太陽風吹乾吹淨?

咁大粒o既?!

bias??!!!:shock:
咩唻ga?

Wah! 寫:幾個km厚吧?

我搵到呀...有20km

好靚呀!!!!!!!