事件：1986年1月28日，挑战者号航天飞机在起飞73秒后爆炸，机上所有宇航员全部遇难。
What happened: on January 28, 1986 the Space Shuttle Challenger broke apart 73 seconds after takeoff, killing all the astronauts on board.
泰洛斯1号卫星在两极之间环绕地球运行，每30秒钟拍摄一张照片，如配图中的图像系列所示。
TIROS-1 orbited from pole to pole, snapping photos every 30 seconds, as illustrated in this series of images.
热火- 1x号燃烧了60秒并产生了将近9,000磅(4,100)的推力。
HEAT-1X burns for 60 seconds and generates almost 9, 000 pounds (4, 100 kilograms) of thrust.
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