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flag Astronomers used Earth and Gaia data to measure a rogue planet’s mass, finding it about 22% of Jupiter’s, likely ejected from a planetary system.

flag Astronomers have measured the mass of a rogue planet—about 22% that of Jupiter and similar to Saturn’s—using gravitational microlensing observed from both Earth and the retired Gaia space observatory. flag By analyzing the timing difference of the planet’s light-bending effect from two locations, researchers determined its mass and distance, suggesting it likely formed in a planetary system before being ejected. flag This breakthrough demonstrates a new method for studying free-floating planets, which are otherwise difficult to detect. flag The upcoming Nancy Grace Roman Space Telescope is expected to greatly increase such discoveries.

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