The Space X rocket has exploded on the launch pad at the Kennedy Space Center in Florida.
Space X is a company that designs, manufactures and launches advanced rockets and spacecraft.
The company say no-one has been hurt but we don’t know why the blast happened.
Smoke was still coming from the site a day later and the blast shook buildings several miles away.
NASA say Space X were planning to use the rocket to take a satellite into space but the satellite and the rocket have both been destroyed.