Read our Privacy noticeA SpaceX rocket has crashed into the Moon – and experts say it serves as both a warning and a lesson for those of us on Earth. The collision may be dramatic, but the Moon is regularly hit with natural objects, and spacecraft have crashed into the lunar surface before. Experts caution that it is a reminder of the growing threat of space debris, and the harsh conditions on the Moon. It is not the first time that space agencies have used collisions between spacecraft and the lunar surface to better understand the Moon. In the 1970s, for instance, Nasa intentionally crashed pieces of the Saturn V rocket into the Moon to study how they affected it as a whole.