NASA’s newest observatory in space has started its search for planets around other stars, officials said Friday, as astronomers zero in on worlds that are ripe for research by follow-up missions like the James Webb Space Telescope.

Four astronauts strapped into their SpaceX Crew Dragon capsule, undocked from the International Space Station and plunged to a fiery pre-dawn splashdown in the Gulf of Mexico Sunday, closing out the first operational flight of SpaceX’s futuristic touch-screen ferry ship.

Air Force ground controllers have activated service aboard the newest Global Positioning System satellite, achieving that milestone for the final spacecraft in a dozen built in a manufacturing batch to update the constellation.