After their flight was scrubbed on Wednesday, four astronauts successfully lifted off, which will allow two NASA astronauts to return to Earth after an unexpected extended stay in orbit.

NASA’s newest space telescope, called SPHEREx, finally got off the ground this week, after a series of delays that had stalled its launch since late February. From low-Earth orbit, it will gather data on millions of stars and galaxies—and search for the ingredients of life.

NASA’s newest space telescope rocketed into orbit Tuesday to map the entire sky like never before — a sweeping look at hundreds of millions of galaxies and their shared cosmic glow since the beginning of time.