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Breaking: Hubble Telescope Opens a "Window" into the Dark Universe — First-Ever Detection of a Starless Dark Matter Cloud! In a groundbreaking discovery announced by NASA, the Hubble Space Telescope has revealed an entirely new class of cosmic object: a vast, starless cloud dominated by dark matter, rich in...

10,671 görüntüleme • 4 ay önce •via X (Twitter)

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The Milky Way and Andromeda are currently separated by about 2.5 million light-years. Drawn together by gravity, Andromeda approaches us at roughly 110 km/s. Though this speed is immense, the vast cosmic distances mean the process will unfold slowly over billions of years. Recent studies using data from Hubble and Gaia suggest the long-predicted merger is not certain: there's roughly a 50% chance the galaxies will collide and merge within the next 10 billion years, with only a small probability of it beginning in the classic ~4–5 billion-year timeframe. As the galaxies interpenetrate, powerful gravitational tides would eject enormous streams of stars, gas, and dust—forming glowing tidal tails that trail across space like celestial ribbons. New star formation would flare in compressed gas clouds, lighting up the chaos with brilliant nebulae. Despite the dramatic term "collision," individual stars are so sparsely distributed that direct crashes would be exceedingly rare. Instead, gravity would gently reshuffle orbits: some systems flung to the outskirts, others spiraling toward a shared center. At the hearts of both galaxies lie supermassive black holes—ours at ~4 million solar masses, Andromeda's far larger. Over eons, they would inspiral and coalesce in a cataclysmic union, unleashing ripples of gravitational waves across the cosmos. In the end, the spirals we know would dissolve into a single, grand elliptical galaxy—a transformed beacon in the Local Group, born from one of the universe's most patient spectacles. 🎥 skywolf400

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In July 1994, NASA's Hubble Space Telescope captured one of the most dramatic events ever witnessed in our solar system: the spectacular collision of Comet Shoemaker-Levy 9 with Jupiter—the first-ever directly observed impact between two solar system bodies.Discovered just a year earlier, the comet had already been torn into a dramatic "string of pearls" of roughly 21 fragments by Jupiter's powerful tidal forces during a close pass in 1992. Those pieces then slammed into the giant planet at staggering speeds of about 60 km/s (over 130,000 mph) between July 16 and 22, 1994.The crashes unleashed enormous fireballs and ejected massive plumes of material high above the cloud tops, excavating debris from Jupiter's deeper atmospheric layers. Hubble's razor-sharp images revealed huge, dark scars—some stretching more than Earth's diameter across—etched into the planet's southern hemisphere. These eerie black blemishes, composed of impact debris and altered chemistry, lingered for months and were so prominent they could be spotted even through modest backyard telescopes. The towering plumes provided astronomers an unprecedented window into Jupiter's hidden chemistry, revealing sulfur compounds and other materials dredged up from below the visible clouds. This once-in-a-lifetime spectacle revolutionized our knowledge of cosmic collisions, dramatically underscored Jupiter's vital role as the solar system's gravitational "sweeper" that deflects or captures many potential Earth-threatening objects, and fueled major advances in planetary defense strategies. Source: NASA Goddard Space Flight Center (with imagery from Hubble observations)

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