Astronomers studying three faint galaxies—DF2, DF4, and DF9, located about 65 million light-years away—found they contain almost no dark matter, unlike most galaxies. A paper published in The Astrophysical Journal in June 2026 proposes these galaxies formed when two ordinary galaxies collided, with their gas and dust clumping together while dark matter passed through largely undisturbed, leaving behind dark-matter-poor remnants.
quantamagazine.org
· 2026-10-17
Researchers report that massive mountain ranges formed by continental collisions once existed in what is now Antarctica. As these supermountains eroded over millions of years, they released nutrient-rich sediment that scientists say coincided with periods of rapid biological expansion on Earth.
gizmodo.com
· 2026-09-24
Growing numbers of satellites and debris in low-Earth orbit are prompting SpaceX and other operators to repeatedly reposition spacecraft to avoid collisions. The increasing density of objects, ranging from active satellites to defunct hardware and fragments, is straining existing traffic-management practices.
wsj.com
· 2026-08-30
GoKawiil