Scientists are hunting for massive ripples in space by watching for tiny, synchronized 'wobbles' in thousands of distant galaxies.
March 25, 2026
Original Paper
Low-Frequency Stochastic Gravitational-Wave Background in Gaia DR3 catalogue
arXiv · 2603.23028
The Takeaway
By repurposing data from the Gaia mission, which maps a billion stars, researchers can detect gravitational waves from the distant past. It works by noticing how the positions of far-off galaxies shift together as the space between us and them literally stretches and squeezes.
From the abstract
We investigate the potential to detect low-frequency gravitational waves (GWs) through their imprints on the proper motions of distant quasars observed by the Gaia mission. Using astrometric data from Gaia DR3, we simulate the effect of GWs on the proper motions of quasars, incorporating their actual sky positions and measurement uncertainties.We investigate two data analysis techniques for the extraction and characterization of GW signals from quasar proper motions: Vector Spherical Harmonics (