鬼斧神工的絕美天然洞穴

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格陵蘭冰盾

　　洞窟探勘人員用繩索深入格陵蘭冰盾300英尺(約合90米)處。類似這樣的冰河洞穴是季節性融水或者地熱噴口在冰盾內部切割出裂縫和通道形成的。由於由冰構成，冰河洞穴處於極為不穩定狀態，致使勘探人員面臨獨一無二的挑戰。
　　2.美國熔岩床國家紀念碑...

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At the bottom of the world, an observatory embedded in ice and designed to catch bountiful but elusive subatomic particles could give astronomers a brand-new look at the universe.

An international team of scientists reported on Thursday that over a two-year period they had detected 28 of these particles, known as neutrinos, that arrived from outside the solar system and possibly from across the