As wide as 2 Earths – like nothing seen on any other world – Saturn’s hexagon was thought to be a feature of the lower atmosphere, where Saturn’s weather happens. Now there’s evidence it extends high above the cloudtops.
Dyson spheres are hypothetical megastructures built by extraterrestrials for the purpose of harvesting all of a star’s energy. Here’s how the European Space Agency’s Gaia mission might help find one.
Astronomers made the sharpest and clearest map yet of a distant starburst galaxy, where stars form 1,000 times faster than in our Milky Way. They’re now calling this galaxy an “unstoppable monster.”