SUNSET: 
Number of Known Mysterious Radio Flashes Nearly Quadruples
The CHIME telescope has released its first catalog with 492 unique sources of fast radio bursts, the brief flashes of radio waves that have been intriguing astronomers over the past decade.
Astronomy in Pictures: Unraveling Galaxies and Clyde's Spot
This week in astronomy pictures: Peer into our galaxy's busy core, watch Clyde's Spot unravel at Jupiter, and see a stunning Hubble photo of a lopsided galaxy.
Astronomers Challenge Claim of Planet Around Barnard's Star
Astronomers thought a super-Earth might orbit nearby Barnard's star. But a new study disputes that claim, arguing that stellar activity might be masquerading as the planetary signal.
Sights and Sounds of the Solar System
Spacecraft are returning sights and sounds from Venus, Jupiter, and beyond — here's a sampling.
What’s Inside Neutron Stars?
Size measurements of two neutron stars have narrowed down what kinds of exotic matter might exist in their extremely dense cores.
Dark Matter "Wake" in the Milky Way's Outer Reaches
Astronomers have discovered that a satellite of the Milky Way has left a "wake" in the dark matter halo that surrounds our galaxy.
Proxima Centauri Releases Powerful Flare
The Sun dwarfs its nearest stellar neighbor, but Proxima Centauri's flares pack a comparatively energetic punch.
Crab Pulsar's Mystery Bursts Are Even More Powerful Than We Thought
The Crab Nebula pulsar has sporadically bursted for decades. Now, astronomers have found these mysterious bursts release even more energy than thought.
Astronomers Use AI to Investigate Quasars and Galaxies Galore
New applications of machine learning have enabled astronomers to classify 27 million galaxies and pick out a dozen rare quadruply lensed quasars.
Interstellar Comet Was Pristine Sample of Planet Formation
New analysis shows that Comet 2I/Borisov, which zipped nearest the Sun in late 2019, was unlike any comet we’ve seen before.
Astronomy in Pictures: Jupiter's Aurora, Cosmic Threads & Newborn Stars
This week in pictures: Astronomers have watched auroral storms at Jupiter, imaged strands of the cosmic web, and seen stellar fireworks off the sword of Orion.
Is an Ocean of Mars Water Trapped in the Planet’s Crust?
A new study suggests that by 3 billion years ago, most of the Red Planet’s water was locked away in minerals, and it has stayed there ever since.
Arecibo's To-be-determined Future
As cleanup operations are underway at Arecibo Observatory in Puerto Rico, some scientists are proposing a replacement for the esteemed radio dish.
What — and Where — Is the North Polar Spur?
Astronomers make the case that a gigantic ridge of gas sticking out of the galactic plane was blown out by a cluster of nearby supernovae.
60-second Astro News: Venus Close-up and Supernova 1987A
Now, there's more evidence that astronomers have found the pulsar at the heart of Supernova 1987A. Plus, a new stunning image of Venus.
Amateur Astronomers Reveal Long-Ago Galaxy Mergers
The images from five Brazilian amateur astronomers have captured Hubble-level details in galaxies, laying the ground for future work in understanding their histories. Want to join the fun?
Watch Online: NASA's Perseverance Landing on Mars
One week from today, NASA's Perseverance rover will land on Mars. Find resources here — including broadcast of the landing itself.
The Alignment of the Milky Way’s Entourage, Explained
Astronomers are starting to understand why the dwarf galaxies around the Milky Way are aligned along a plane.
What New Horizons Found in Deep Space — And Why It Matters
NASA’s mission to the outer solar system has found more light than expected. That could mean more galaxies in the visible universe than we thought— or less, depending on who you talk to.
Beyond Starlink: The Satellite Saga Continues
SpaceX has placed more than 1,000 Starlinks in orbit, and other companies are following suit. Here's the latest on what's being done to protect astronomy.
