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

Published

1 day 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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SpaceX Reschedules Planned Starship Test Flight Launch Due to Equipment Glitch

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6 hours ago

August 25, 2025

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SpaceX has postponed the highly anticipated 10th test flight of its Starship megarocket after engineers discovered a glitch in the launch pad’s ground systems. The launch was originally set for Sunday, Aug. 24, from the company’s Starbase facility in South Texas but was halted just 17 minutes before liftoff. The countdown was paused to allow troubleshooting, and t…

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

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1 day 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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1 day 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…