The satellites, both of which weighed in excess of 1,000 pounds, and traveling at approximately 17,500 miles per hour, collided 491 miles above the Earth. The previous text is in English. Here is a translation to Chinese (Simplified):
这两颗都超过 1,000 磅的卫星以每小时 17,500 英里的速度飞行，在距离地球 491 英里的上空相撞。