AvatarJohn CatanzaroAsk Ethan: How Many Black Holes Are There In The Universe?Forbes - Ethan SiegelFor the third time in history, we've directly detected an unmistakable signature of black holes: gravitational waves resulting from their merger. Combine that with what we know from stellar orbits around the galactic center, X-ray and radio observations of other galaxies, and gas infall/velocity …
AvatarJohn CatanzaroScientists made an unprecedented map of the night sky — and the results are alarmingverified_publisherBusiness Insider - Sean KaneAstronomers loathe light pollution, also called skyglow: a dim yet pervasive orange light that obscures a crisp view of the night sky. But as a new study called "The new world atlas of artificial night sky brightness," published in the journal Science Advances shows, there's a shocking amount of …