http://www.popularmechanics.com/spac...ling-to-earth/
Normally, a decommissioned satellite or space station would be retired by forcing it to burn up in the atmosphere. This type of burn is controlled, and most satellite re-entries are scheduled to burn up over the ocean to avoid endangering people. However, it seems that China's space agency is not sure exactly when Tiangong-1 will re-enter the atmosphere, which implies that the station has been damaged somehow and China is no longer able to control it.
━キタ━(゚∀゚)━キタ━
衛星降下作戰
一般衛星同太空站進入成層圈自燃既過程,都係受控制既,所以可以計算到地點同時間,而支那 e+ 仍然提供唔到預測地點,即係好大機會已經不受控制。
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