Sent_en: 2zh The satellites, both of which had a mass in excess of 450 kilograms, and were traveling at approximately 17,500 miles per hour (28,150 km/hour), collided 491 miles (790 km) above the earth.
Sent_yy: 这两颗卫星的质量都超过450公斤，每小时以大约17,500英里（28,150公里/小时）的速度在地球上空491英里（790公里）处相撞。