05/11/2026
Zoom in on the Milky Way’s galactic bulge, a densely packed region of stars that also houses our galaxy’s supermassive black hole. Its crowded field of view is useful for detecting objects, typically stars, that pass between us and the bulge using a phenomenon known as microlensing. In this process, an intervening object warps the light from a background star in the bulge. Astronomers theorize that this technique will reveal more than a thousand new exoplanets, some free-floating and some orbiting stars.
A team of astronomers utilized the Hubble Space Telescope to observe the same region that the Nancy Grace Roman Space Telescope will in its Galactic Bulge Time-Domain Survey, which will enable a more thorough analysis of these microlensing events.
Credit: NASA, Alyssa Pagan (STScI); Sean Terry (UMD), Jay Anderson (STScI), 2MASS, IPAC/CALTECH, ESO, VVV Survey, Dante Minniti (UNAB), Ignacio Toledo (ALMA), Martin Kornmesser (ESO).