A big piece of a SpaceX rocketrocket/ˈrɒkɪt/L1火箭（可以飞到太空的机器）A machine that flies into space. hit the moon on Wednesday and the rocket part was the top. It was 40 feet long and weighed 10,000 pounds. The rocket launched two moon landers last year and then flew in space for over a year. It hit the moon very fast. The crashcrash/kræʃ/L1撞击（两个东西猛烈地撞在一起）When something hits something else very hard. was seven times the speed of sound. It made a big hole almost 90 feet across.
Scientists watched the crash to learn about the moon and a scientist named Bill Gray studies space. He said the crash helps us learn about space junk and space is crowded. One lander landed on the moon and the other crashed.
The crash was not a big problem for EarthEarth/ɜːrθ/L1地球（我们住的星球）The planet where we live., but it can help us learn for the futurefuture/ˈfjuːtʃər/L1未来；将来The time that is coming after now..
