Black Holes Merge: A Historic Spacetime Event

Galaxies on Instagram: "On a clear, dark night with no light pollution, the human eye can see about 2,500 to 3,000 stars at once from any one location on Earth. That’s out of roughly 5,000 to 6,000 visible to the naked eye total (since half the sky is below the horizon). If you use binoculars or a telescope, that number jumps into the hundreds of thousands to millions, depending on the equipment and conditions. But with just your eyes, around 3,000 max is what you’ll see under perfect skies."

Scientific American on Instagram: "If you look up at the sky tonight, you might see two rare things at once: a comet AND a meteor shower.  Learn more about the two astronomical events at the link in our bio.  Clara Moskowitz ️ Carin Leong  Amanda Montañez; Source: Stellarium with additions by Bob King (reference)  Brennan Gilmore, Getty Images ✏️ Dan Falk #comet #meteorshower #space #astronomy #science"