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Mars gully

Solar System

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

Explore the Night with Bob King

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.

First look at Dinkinesh and its satellite

Solar System

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.

orange-colored landscape of a gently sloping mount with flows highlighted in red

Solar System

Venus’s Volcanoes Live

The evidence is in: Venus is volcanically active.

Galilaei crater May 20, 2024

Explore the Night with Bob King

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.

Eta Aquariids from Australia

Explore the Night with Bob King

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.

Pluto full disk high resolution

Solar System

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.


Solar System

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.”

Mimas appears like the Death Star

Solar System

How Saturn’s Moon Mimas Might Have Melted

Maybe everything in the outer solar system is an ocean world.

Jupiter and GRS

Solar System

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.

Sungazing comet caught in widefield photo of total solar eclipse

Solar System

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.

Little Rock, AR April 8 all-sky view

Explore the Night with Bob King

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.

Air-Spec, the first iteration of the instument now called ACES

Solar System

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.

Solar System

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.

Map of ancient volcano on Mars

Solar System

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.

Solar System

Webb Telescope Reveals Worlds in the Farthest Reaches of the Solar System

James Webb Space Telescope data on distant worlds confirm some solar system formation hypotheses and confuse others.

Betelgeuse close-up

Explore the Night with Bob King

Is Betelgeuse Fading Again?

Betelgeuse has dipped nearly half a magnitude since late January. Could it be headed for another Great Dimming Event? We also take a look at this spring's "other" eclipse.

Phobos over Mars

Solar System

Icy Impactor Might Explain the Formation of Mars’s Moons

In a new study, scientists suggest an impact with a giant icy object could explain the formation of Mars's moons, Phobos and Deimos.

Uranus and Neptune

Solar System

Astronomers Find New Moons of Uranus and Neptune

The three new moons for Uranus and Neptune are each part of a "family," groupings that fragmented from a single parent object.

Impact simulation frame

Solar System

NASA's DART Impact Reshaped the Asteroid Dimorphos

Models of the NASA's DART impact reshaping the asteroid moon Dimorphos show that this object is "rubble all the way down."

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