Ursa Major III May Be a Star Cluster, Not a Dark-Matter Dwarf Galaxy

Published

12 hours ago

August 24, 2025

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Astronomers have long thought Ursa Major III, also called UNIONS 1, was a dark-matter-packed dwarf galaxy. But new simulations suggest it may instead be a compact star cluster bound by black holes and neutron stars. Located 30,000 light-years away, Ursa Major III contains just ~60 visible stars yet shows puzzlingly high stellar velocities. The new analysis explains th…

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Rare Giant Solar Tornado and Plasma Eruption Captured Together on the Sun

Published

8 hours ago

August 24, 2025

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A Romanian researcher captured a rare sight on the Sun — a giant solar tornado alongside a massive plasma eruption. Both events, driven by magnetic field changes, highlight the Sun’s extreme activity during solar maximum. Luckily, the eruption’s CME is not headed toward Earth.

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Russia Launches Bion-M No.2 with Mice, Flies, and Seeds to Study Space Biology

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9 hours ago

August 24, 2025

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Russia’s latest resupply mission to low-Earth orbit has delivered a unique scientific cargo: 75 mice, 1,000 fruit flies, microbes, cell cultures, and plant seeds aboard the Bion-M No.2 biosatellite. Over the next month, these organisms will orbit Earth, helping scientists study how microgravity and cosmic radiation affect life. Some mice are genetically engineered t…

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NASA’s Expedition 73: Astronauts Study Brain, Balance, and Immunity on ISS

Published

10 hours ago

August 24, 2025

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Astronauts aboard the International Space Station are conducting key health experiments as part of Expedition 73, focusing on how the brain and immune system adapt to microgravity. Crew members exercise to counter muscle and bone loss, complete cognitive tests, and practice emergency medical drills. Using virtual-reality equipment, they study balance in weightlessness…