A SpaceX Starship rocket exploded on a test stand in Texas, adding to a series of setbacks to Elon Musk’s space ambitions that include trips to Mars.

Starship is being developed as a fully reusable transportation system. This means the rocket and spacecraft will be able to return to the ground for additional missions. In the coming years Starship is intended to carry cargo and humans to the moon and outside of earth’s orbit.