A supernova from 10 billion years ago solved the mystery of the universe's expansion rate
Sandeep K S
Dec 11, 2025
1 min read
Discovering the ancient supernova SN 2025wny, 10 billion light-years away, sheds light on dark energy. This cosmic explosion is exceptionally bright, with gravitational lensing by an intervening galaxy bending its light and creating multiple images. The varied light paths reveal crucial data, helping solve the Hubble tension by recalculating the universe's expansion rate.
Astrophysicists have completed ASTRID, the largest cosmological hydrodynamic simulation ever run, tracing the universe from the cosmic dawn ($z=99$) down to the present day ($z=0$). By resolving 166 billion particles across 815 million light-years, ASTRID unveils how supermassive black holes co-evolve with galaxies and sculpt the cosmic web.
Scientists have uncovered the first robust evidence of a black hole and neutron star crashing together while orbiting in an oval path, challenging long-standing assumptions about cosmic pair formation.
Most neutron star-black hole pairs are expected to adopt circular orbits long before merging, their orbits slowly rounded out by the constant emission of gravitational waves over millions of years.
Far from the warmth of any star, moons orbiting rogue gas giants might harbor oceans of liquid water—and potentially complex life—for billions of years.
Liquid water is considered essential for life. Surprisingly, however, stable conditions that are conducive to life could exist far from any sun.
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