SUNSET: 
Explaining the Odd Behavior of Interstellar Object 'Oumuamua
It wasn't aliens after all — an astrochemist and an astronomer have teamed up to explain why the interstellar object 1I/'Oumuamua behaved the way it did.
Water on Earth Might Predate the Solar System
Astronomers studying the water vapor around a newborn star find that it’s chemically similar to ice in solar system comets, a possible source of Earth’s oceans.
What Is the Sun Made Of? New Data Deepens Debate
New data from a detector tucked under a mountain in Italy has shed light on what's inside the Sun.
Webb's Galactic Distance Record Is Now Official
Spectroscopic measurements confirm Webb's distance record, with images revealing galaxies that existed just 330 million years after the Big Bang.
Arecibo Legacy: New Data on Near-Earth Asteroids
The largest set of radar data for near-Earth asteroids will help us understand their origins and protect Earth from future impacts.
Astronomers Map the Milky Way's "Underworld"
A simulated map of the Milky Way shows the location of our galaxy's stellar corpses — and they're not where you might think they'd be.
Betelgeuse's Great Dimming: The Aftermath
The Great Dimming occurred when Betelgeuse coughed out a huge chunk of material, and the ejection took a toll on the giant star.
Asteroid Ceres Was Radioactive — and That Could Explain a Lot
Radioactive heating in this asteroid's early days may have destabilized the small world, creating asymmetric surface features.
A Black Hole Lurks in a Galaxy Near Our Own
Astronomers have found a dormant black hole orbiting a massive blue star in the Large Magellanic Cloud, a satellite galaxy of the Milky Way.
Have We Found the First Rogue Black Hole in the Milky Way?
Hubble observations have revealed a stellar-mass compact object — a black hole or possibly a neutron star — wandering our galaxy.
Mystery of the Sun's Chemical Makeup Lingers
Astronomers think they might have a solution to the conundrum of the Sun's chemical composition.
Icy Moon Europa May Host Water Near the Surface
Radar measurements of ice on Earth suggest that Jupiter's moon Europa might host water near its surface.
Summer on Neptune is Surprisingly Chilly
Even though Neptune is entering its version of summer, it's actually cooling down — except for its poles, which are mysteriously warming up.
These Two Black Hole Behemoths Will Merge in 10,000 Years
Astronomers have discovered a pair of supermassive black holes that whirl around each other every two years.
Astronomers Watch the Making of a Super-Earth
Gaseous mini-Neptunes may become rocky super-Earths when they lose their atmospheres. Now, astronomers have caught that process in action.