ESA's XMM-Newton spacecraft has detected an unprecedented X-ray signal coming from the very edge of a supermassive black hole.
This defies how we thought matter falls into black holes, and points to a potential source of gravitational waves for ESA’s future LISA mission.
ESA Writeup: https://www.esa.int/Science_Exploration/Space_Science/XMM-Newton/XMM-Newton_catches_giant_black_hole_s_X-ray_oscillations
(Artist impression: NASA/Sonoma State University, A. Simonnet)
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