A SpaceX rocket that exploded after liftoff on Sunday was the third resupply mission in a row to the International Space Station to end in catastrophe.

The tons of food, equipment, and experiments that have gone up in flames over the last year are raising concerns about supplying the space station and the astronauts who live there—and about the future of the burgeoning private space industry.

For the three astronauts living aboard the space station, the clock is ticking.

“The commercial cargo program was designed to accommodate loss of cargo vehicles,” NASA Administrator Charles Bolden said in a statement. But with the string of recent losses, the space station is due to dip into reserve supplies of food and the canisters that collect