Light travels faster than sound at the speed of 300,000 kilometres per second.
光速比声速要快，为每秒钟30万公里。
After millions of years in this position the new moon was drawn into a collision at a speed of less than three kilometres per second.
几百万年后，此状况下的新月亮以低于每秒3公里的速度要对撞了。
After millions of years in this position the new moon was drawn into a collision at a speed of less than three kilometres per second.
几百万年后，此状况下的新月亮以低于每秒3公里的速度要对撞了。
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