Cosmic Wake Exposes Hidden Motions ⚡ экспресс
Moving gravitational lenses slightly distort the cosmic microwave background — a predicted yet elusive effect. By analyzing CMB maps from the ACT telescope and the distribution of distant red galaxies, physicists have for the first time reliably detected a signal of dark matter's transverse velocities. The confidence level reached 4.8 standard deviations, firmly indicating the effect is real. This method paves the way for mapping the 3D velocity field of the universe — akin to ocean currents, but on a cosmic scale.
Moving clumps of galaxies and invisible dark matter create wakes in the afterglow of the Big Bang, like boats stirring a pond. This wake—the moving lens effect—is so subtle it shifts the light’s temperature by only a few millionths of a degree: comparable to detecting a candle’s heat from across a continent.
Now, combining two telescope surveys, astronomers have detected this sideways motion for the first time. Until now, we could only see how matter moves toward or away from us.
Pair this with the Sunyaev-Zel'dovich effect, which tracks gas motion, and a full 3D velocity map emerges. Such maps will test the standard model of cosmic expansion and trace the hidden currents shaping our universe.
🎯 The effect shifts the temperature of the oldest light by only a few millionths of a degree — like detecting a candle’s warmth from across a continent.
🎬 Mapping cosmic flows in 3D feels like stepping into the navigator's seat in 'Dune', where space travel depends on reading invisible currents.