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New study reveals NASA's Roman could find 400 Earth-mass rogue planets

New research by scientists from NASA and Japan's Osaka University suggests that rogue planets—worlds that drift through space untethered to a star—far outnumber planets that orbit stars. The results imply that NASA's Nancy Grace Roman Space Telescope, set to launch by May 2027, could find a staggering 400 Earth-mass rogue worlds. Indeed, this new study has already identified one such candidate.
"We estimate that our galaxy is home to 20 times more rogue planets than stars—trillions of worlds wandering alone," said David Bennett, a senior research scientist at NASA's Goddard Space Flight Center in Greenbelt, Maryland, and a co-author of two papers describing the results. "This is the first measurement of the number of rogue planets in the galaxy that is sensitive to planets less massive than Earth.