SUNSET: 
Woo-hoo — The Perseid Meteor Shower Is Coming!
It's time again for the annual August meteor-shower fest, the Perseids. This year's display should be a beauty with only minor moonlight and a special surprise at dawn.
Does This Mars Rock Show a "Potential Biosignature"? Or Just "Wet Chemistry"?
"Leopard spots" on a Mars rock could come from life — or they could simply be a sign of a type of chemical reaction that requires water.
New Exploration of Titan's Seas
A new look at data from NASA's Cassini mission confirms methane cycles on Saturn's largest moon, Titan, just as water cycles on Earth.
How Long Has Jupiter's Great Red Spot Been Around?
A new study follows two lines of research to suggest that that Great Red Spot we see today has not, in fact, been going for as long as we thought.
Did the Solar System Once Collide with an Interstellar Cloud?
Astronomers have proposed a rather uncomfortable past for our solar system and our planet — as well as an alternative explanation for a radioactive anomaly on Earth.
What Martian Gullies Mean for Water on Mars
Martian gullies have been the center of a debate about whether Mars ever has flowing water. Now, a comprehensive study examines the question.
Comet 13P/Olbers Juices Up June Skies
June brings heat and bugs but also a moderately bright, early-evening comet that returns every 69 years.
NASA's Lucy Mission Reveals Asteroid's Strange Moon
The asteroid Dinkinesh surprised NASA’s Lucy mission when it turned out to have a moon. Now, scientists are taking a closer look at the pair’s formation.
Why Did Galileo Get Such a Puny Crater?
Galileo was one of the first people to study the Moon through a telescope. You'd think he'd get more than 10-mile-wide crater for his efforts. But of course, there's more to the story.
Ready the Hot Cocoa and Recliner — Here Comes the Eta Aquariid Meteor Shower!
You might be tempted to sleep through this annual shower but then you'd miss seeing some of the fastest meteors around. Not to mention their parent is the most famous comet of all.
A Cosmic Arrow Pierced Pluto's Heart — Is It Still There Beneath the Surface?
A giant impact likely formed Pluto's heart-shaped basin, Sputnik Planitia. A big chunk of the impactor’s core might still be buried under the ice.
Earth’s Mini-Moon Linked to Farside Lunar Crater
Researchers might have located the birthplace of 469219 Kamo‘oalewa, a small asteroid that has been described as Earth’s “mini-moon.”
How Saturn’s Moon Mimas Might Have Melted
Maybe everything in the outer solar system is an ocean world.
Meteorites Tighten Timeline for Giant Planets’ Movement through the Solar System
By linking a family of meteorites on Earth to their relatives in the asteroid belt, scientists have arrived at a new understanding of the giant planets' movement early in the solar system's history.
Amateur Astronomers Caught Sungrazing Comet during Solar Eclipse
Wide-field photos of the total solar eclipse taken by several astronomers along the path of totality, caught a comet approaching the Sun.
What Will We See in the Sky During Totality?
Most of our time will be focused on Sun during the minutes of totality on April 8th, but consider tearing yourself away for a few seconds to put it all in context.
Chasing the Eclipse from the Air
A solar-imaging instrument will fly on a high-altitude aircraft to explore infrared emission from the Sun’s corona.
Could We See the Sun Erupt on Eclipse Day?
Ejections of solar material are increasingly commonplace as the Sun’s activity ramps up. Here’s what to expect if an eruption occurs on eclipse day.
Giant Ancient Volcano Discovered on Mars
Scientists have identified a colossal volcano on Mars using satellite imagery. It was undetected for decades due to extensive erosion.
