Major Astronomy News in June 2025: Webb’s Exoplanet Discovery, Rubin’s First Images, Space Missions & More
The James Webb Space Telescope directly imaged a Saturn-mass exoplanet, TWA 7 b, about 0.3 Jupiter masses at 50 AU from its star, marking Webb’s first direct exoplanet discovery. The missing baryon problem was resolved using 69 fast radio bursts, showing about 76% of ordinary matter lies in hot intergalactic gas, ~15% in halos around galaxies, and ~9% in galaxies. Comet C/2014 UN271 (Bernardinelli–Bernstein), the largest Oort Cloud comet, showed CO outgassing jets at 16.6 AU with a nucleus about 140 km across, observed by ALMA. Solar Orbiter delivered the first views of the Sun’s south pole from an inclination