holes

There’s a “dark impactor” blasting holes in our galaxy. We can’t see it. It might not be made of normal matter. Our telescopes haven’t directly detected it. But it sure seems like it’s out there. “It’s a dense bullet of something,” said Ana Bonaca, a researcher at the Harvard-Smithsonian Center for Astrophysics, who discovered evidence for the impactor. Bonaca’s evidence for the dark impactor, which she presented April 15 at the conference of the American Physical Society in Denver, is a series of holes in our galaxy’s longest stellar stream, GD-1. Stellar streams are lines of stars moving together across … Read more