美國宇航局(NASA)計劃試驗史上最大降落傘
NASA to test flying saucer
NASA擬測試降落傘NASA plans to try out the largest parachute ever deployed during a flying saucer launch that will test new technologies for landing on Mars.
美國宇航局計劃在一次飛碟發射中測試着陸火星的新技術，試驗史上最大的降落傘。
The US space agency figured out how to do this decades ago, but with the goal of sending humans to Mars in the 2030s, the agency is now testing the Supersonic Ringsail Parachute that is 30 meters in diameter, which could allow even heavier spacecraft to land softly by slowing the entry vehicle from Mach 2 to subsonic speeds.
美國宇航局早在幾十年前就已掌握使用降落傘減速技術，但該局計劃於本世紀30年代將宇航員送到火星，因而將對"超音速環帆降落傘"進行測試。該降落傘直徑達30米，可以把飛行器的速度從兩倍音速減至亞音速，讓載重更大的飛行器平穩降落。
