NASA’s Pandora exoplanet satellite successfully launched on a Falcon 9 rocket from Vandenberg Space Force Base on Sunday as part of SpaceX’s “Twilight” mission.

Pandora, weighing 716 pounds, will spend a year observing at least 20 known exoplanets as they transit their stars, helping astronomers study planetary atmospheres and disentangle stellar effects from planetary signals.

The mission also carried around 40 other satellites, including Kepler Communications’ Aether satellites and Capella Space’s Acadia radar satellites.

Pandora will focus on planets with water- or hydrogen-dominated atmospheres, using visible and infrared data to improve characterization of exoplanetary systems, Space.com has reported.

The Falcon 9’s first stage successfully landed back at Vandenberg, marking the booster’s fifth flight.