NASA astronauts Butch Wilmore and Sunita Williams, who were stuck in space for more than nine months, are speaking out after their return to Earth.

The rocket, developed by Isar Aerospace, lifted off from Norway’s Andøya Space Center and crashed about 30 seconds later. The test flight was part of efforts to make Europe a center for private satellite launches.

The unmanned Spectrum rocket, an orbital rocket developed by German start-up Isar Aerospace, crashed and exploded 40 seconds after takeoff.

A German start-up’s orbital rocket spun out and crashed seconds after take-off Sunday, in a rare European test flight that the makers said “met its set goals.”