In 2025, astronomers made landmark discoveries across the solar system and deep space. New moons, rare exoplanets, silent black holes, and record-breaking mergers reshaped scientific understanding. Observatories like JWST, LIGO, and Pan-STARRS played key roles in revealing extraordinary cosmic objects.

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•  Saturn’s moon count jumped to 274 after 128 new small, collision-fragment moons found.
•  Webb telescope detected a new Uranian moon, S/2025 U1, raising total to 29.
•  Earth confirmed to have quasi-moon 2025 PN7, orbiting nearby for 60 years.
•  Super-Earth GJ 251c discovered 18.2 light-years away in a star’s habitable zone.
•  Extreme exoplanet TOI-2431 b confirmed; orbits star in 5 hours with molten surface.
•  LIGO recorded black hole merger doubling event-horizon area, confirming Hawking theory.
•  JWST spotted colliding ring galaxies forming an ∞ shape with a rare direct-collapse black hole.
•  Hidden supermassive black hole detected in Large Magellanic Cloud after star-speed analysis.
•  Discoveries expanded understanding of ring formation, planetary evolution, and black-hole growth.