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."

Astro Alexandra on Instagram: "TWO comets in the night sky this week alongside the Orionids meteor shower and the new moon! #space #astronomy #nasa #science"

Star Walk 2 — Best Astronomy App 💫 on Instagram: "Venus vanishes behind the Moon! 🌘🌟 On September 19, from 10:34 to 14:26 GMT, enjoy the lunar occultation of Venus. Visible to the naked eye, though binoculars make the event even more exciting. Watch the video for details! 👀 #venus #moon #stargazing #StarWalk #astronomy"

Museum of Science on Instagram: "Heads up, skywatchers: the Taurid Meteor Shower is active now through December 10!  With peak nights on November 4–5 and 11–12, this year could bring a rare “fireball swarm”. These would be extra-bright meteors from two overlapping streams, the Northern and Southern Taurids. Just look up from dark skies, and you could catch dazzling fireballs lighting up the night. #Taurids #MeteorShower #Astronomy #SkyWatch #Space"