Gravitational waves and galaxy maps measure the expansion of the Universe ⚡ экспресс
Original: "First measurement of the Hubble constant from gravitational wave-galaxy cross-correlations"
For the first time, by combining galaxy maps and gravitational waves, scientists measured the expansion rate of the Universe.
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When two dead stars collide, they shake the fabric of space. By combining these ripples with maps of millions of galaxies, astronomers found a new way to measure the expansion rate of the Universe. It's like hearing the beat of cosmic drums and seeing the dance of galaxies — together they reveal the tempo of creation.
🎯 In astronomy, distances are measured using objects of known brightness — they're called 'standard candles'. Gravitational waves work differently: their loudness directly tells the distance. That's why these sources are nicknamed 'standard sirens' — a cosmic sound that announces how far away it is.