A rogue SpaceX Falcon 9 rocket upper stage is believed to have crashed into the moon, striking with a force equivalent to three tonnes of dynamite. TRENDING Stories Videos Your SayThe incident was unintentional with SpaceX never planning for the spent rocket stage to hit the Moon. Yet experts cautioned that the incident serves as a stark reminder of humanity's mounting space debris problem. "I think more people should be more worried about space debris," he said. In 2009, the agency intentionally crashed a rocket stage into the Moon to examine the plume of material thrown up by the impact.