An amateur-built rocket fell apart seconds after takeoff from a secret Nevada launch site this month, dashing hopes that it would fly beyond the edge of space.

The Civilian Space eXploration Team (CSXT) had designed the unmanned Primera rocket to reach a height of more than 60 miles.

Fifty miles high is commonly accepted as the edge of space. It is the minimum altitude that humans much reach for the U.S. government to designate them astronauts.

“The launch was spectacular and the rocket was performing as planned. However, the rocket experienced motor failure during the flight and the flight was terminated,” said Eric Knight, co-leader of the CSXT mission.