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如果搵到個行星，有水，有大氣層，
有岩石陸地，有磁場，但距離地球幾十，幾百光年
咁點先證實到呢個行星有冇生命？
如果有高度文明，應該可以探測到radio wave之類
但如果只係得簡單生物，細菌，咁可以點做？
到真係證實到有外星生物，下一步又要點做？
派太空船飛N年去探測好似太冒險
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If the Milky Way had been in the center of the Bootes void," says astronomer Greg Aldering of the University of Minnesota, "we wouldn't have known there were other galaxies until the 1960s
If the Milky Way had been in the center of the Bootes void," says astronomer Greg Aldering of the University of Minnesota, "we wouldn't have known there were other galaxies until the 1960s
If the Milky Way had been in the center of the Bootes void," says astronomer Greg Aldering of the University of Minnesota, "we wouldn't have known there were other galaxies until the 1960s
如果個星球唔係球體你係咪想講球體
質量有番咁上下引力拉到咁
咁突出嚟嘅地方就會變成好高嘅高山
直到一個大細，下面嘅岩石or whatever就會支撐唔住
山崩變成一舊大概係球體嘅嘢
所以足夠大嘅天體(直徑>600km)都會呈球狀
不過啲星球都唔係完全球體嘅
星球自轉會令到喺赤道上嘅重力減少(因為畀離心力抵消咗)
令到個星球會扁咗少少
呢個現象叫做equatorial bulge
地球嘅equatorial bulge大約係42km, 大約係地球直徑嘅0.3%
而轉得好快嘅土星嘅equatorial bulge大約係11808km，差唔多係直徑嘅一成
所以大家睇到嘅土星相都係扁嘅
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都扯到變意大利粉， 除非你係魯飛姐講起蟲洞，有無人研究過如果有蟲洞會係咩形狀？其實入到視界係咪會即刻俾tidal force 扯死左？有冇機會生還？
Interstellar同多啦a夢既演繹一樣，在空間中憑空有一個洞，洞入面見到對面，就如沒有深度一樣。
定好似stargate咁，有個不透明視界。
或者見到條隧道要出去先知呢？