dye

點解宇宙之大,大只有地球有生命?

人類沒有檢查過多少個星球。
就現在科學推測，宇宙的確有很多生命

http://www.youtube.com/watch?v=Uhj45BFK5dw&feature=related

For those who are truly interested, the above is how a astro-physicist would say.