Images of six candidate massive galaxies, seen 540 million to 770 million years after the Big Bang, are shown in this undated handout image based on observations by NASA’s James Webb Space Telescope, as one of them (bottom left) could contain as many stars as our present-day Milky Way, but is 30 times more compact. NASA, ESA, CSA, I. Labbe (Swinburne University of Technology)/Handout via REUTERS