An Invisible Intruder Smashed Into the Milky Way: The Impact Scar Found in Stars ⚡ экспресс
Sifting through data from the Gaia space telescope, scientists have spotted a local dip in the vertical speeds of stars across the Milky Way's disk. It sits right where interstellar gas is showing a whole set of disturbances—a gaping void, a molecular ring, and a towering vertical hydrogen 'fountain.' Most likely, this is the scar left by a dark subhalo (a clump of dark matter the size of a dwarf galaxy) that never gave birth to stars. It's rare, direct evidence for the existence of lightweight dark structures, giving us a crucial test for models of how galaxies form.
Astronomers have found a section in the disk of the Milky Way where stars suddenly shift speed — as if an invisible cannonball rolled through a wheat field, flattening the stalks. Nearby, spectroscopy (light-splitting) reveals clouds of hydrogen and other gases, crumpled into a bubble and a giant 'finger.' At the end of this trail, there's not a single star. The culprit? A dwarf galaxy almost entirely made of dark matter, invisible to the eye. The real kicker: the collision happened about 200 million years ago, yet the dent in the stellar disk is still visible — like a scar on the canvas of space. Back in the 20th century, Fritz Zwicky and Vera Rubin showed that without dark matter, galaxies would fly apart. Today's ΛCDM model predicts hundreds of such dark clumps around large galaxies, and this discovery offers a rare chance to test our ideas about the Universe's hidden mass.
🎯 If dark matter were visible, the night sky would be dotted with hundreds of tiny ghost galaxies circling the Milky Way.
🎬 'Dark galaxies' are like the ghost ships of science fiction — massive but invisible.