A tiny galaxy ceased making stars for billions of years. Then it rebooted.

Most small galaxies that stopped making new stars in the early universe never resumed operations. Something caused their celestial factories to shutter. But researchers have used the James Webb Space Telescope, a collaboration of NASA and its European and Canadian space counterparts, to zero in on a dwarf galaxy that bucked the trend,rebooting its star formation after a billions-of-years-long hiatus. The dwarf galaxy, known as Leo P and about 5.3 million light-years from Earth, is offe