Dark galaxy crashing into the Milky Way

日期:2019-03-08 07:04:10 作者:通洄 阅读:

THE Milky Way’s neighbourhood may be teeming with invisible galaxies, one of which appears to be crashing into our own. In 2008, a cloud of hydrogen with a mass then estimated at about 1 million suns was found to be colliding with our galaxy. Now it appears the object is massive enough to be a galaxy itself. Called Smith’s cloud, it has managed to avoid disintegrating during its smash-up with our own, much bigger galaxy. What’s more, its trajectory suggests it punched through the disc of our galaxy once before, about 70 million years ago. To have survived,