<p>This false-color radio image shows the <a href="http://iopscience.iop.org/article/10.1086/588838/pdf">Smith Cloud</a>, a massive gas cloud that’s zooming around our galaxy’s outskirts. <a href="http://www.nasa.gov/feature/goddard/2016/hubble-sees-monstrous-cloud-boomerang-back-to-our-galaxy">New observations</a> show that it was flung off the Milky Way 70 million years ago, and will re-collide in 30 million years.</p>

Boomerang

This false-color radio image shows the Smith Cloud, a massive gas cloud that’s zooming around our galaxy’s outskirts. New observations show that it was flung off the Milky Way 70 million years ago, and will re-collide in 30 million years.

Photograph by Saxton/Lockman/NRAO/AUI/NSF/Mellinger

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