APOD

Explanation: Jinkies, look at all those ghosts! It took 100 hours of observation and a special oxygen filter…

Explanation: Explanation : What is Treble Clef? This unusual radio structure extends over 2 million light-years and resembles…

Explanation: The city lights outshine the stars in the City That Never Sleeps. Who would have thought that…

Explanation: What a cosmic coincidence! In today’s image, Mars joins the Beehive cluster (M44 or Praesepe) below an…

Explanation: This stairway in Chile brings you only a little bit closer to heaven. But ooh, the sky…

Explanation: How many moons can you see? The best answer is five: four orbiting Jupiter and Luna orbiting…

Explanation: Scientists are melting holes in the bottom of the world. In fact, almost 100 holes melted near…

Explanation: Tidally locked in synchronous rotation, the Moon always presents its familiar nearside to denizens of planet Earth.…

Explanation: How was the Saturn system imaged so clearly? Astrophotographer Tom Williams captured such exquisite details due to…

Explanation: “Happy New Year!” No, wait, this is not a fireworks display. This image shows Nebula Pa 30,…

Explanation: Have you ever seen a complete auroral oval? You can’t see one from the ground because it…

Explanation: A deep image of the Sombrero galaxy reveals surprises. M104 is named the Sombrero galaxy because, on…