SUNSET: 
Don't Let the Bright Moon Ruin Your Geminids
Strategies for making the most of this week's Moon-soaked Geminid meteor shower.
Webb Telescope Shows Unexpectedly Crowded Asteroid Belt
A new analysis of archival Webb telescope data reveals small asteroids in the main asteroid belt are far more numerous than thought.
Ancient Venus Didn’t Have Oceans After All
Astronomers have poured cold water on the idea that Venus once hosted oceans on its surface, suggesting instead that the planet's interior has been dry for most of its history.
Icy Rivers May Have Flowed on Ancient Mars
A polar cap of carbon-dioxide ice may have provided the thermal blanket needed for rivers and a huge lake to form in the planet’s southern highlands.
Makemake’s “Hot Spot”: Icy Volcano or Dusty Ring?
Even though it’s nearly 4½ billion miles from the Sun, far-flung Makemake has surprised observers with a warmer-than-expected temperature that is challenging to explain.
Oldest and Largest Impact Crater Found on Venus
Scientists have found possibly the oldest and largest crater on Venus — and it's like none they've ever seen on our sister planet.
We’ve Found the Source of Most Meteorites
Scientists have traced 70% of meteorite falls to three collisions that occurred in the asteroid belt within the past 40 million years.
The Sun's Activity Is Reaching a Fever Pitch
The Sun is approaching the peak of this solar cycle, which means a higher chance of sunspots, flares, and aurora.
Comet Tsuchinshan-ATLAS Climbs, Brightens and Delights!
Treat yourself to a comet bright enough to see plainly even in moonlight. Tsuchinshan-ATLAS beckons at dusk!
Europa Clipper Successfully Launches on Multi-Year Mission to Jupiter’s Icy Moon
After reaching Jupiter in 2030, the spacecraft will study Europa to help assess whether it has the conditions necessary to sustain life.
Severe Geomagnetic Storm Triggers Widespread Aurora October 10-11
The aurora may be visible across much of the U.S. tonight in the wake of dual solar blasts.
Jupiter’s Great Red Spot Shimmies to a Beat
Hubble observations reveal that the storm’s size and shape change in a cyclic pattern.
Hera Mission Launches to Witness Asteroid-Crash Aftermath
The European Agency’s Hera mission has launched, following up on the destructive impact of NASA’s Double Asteroid Redirection Test on the asteroid Didymos.
Europa Clipper Readies for Launch to Jupiter's Icy — and Maybe Habitable — Moon
NASA's spacecraft to Jupiter's icy moon Europa will explore the little world's potential habitability.
See Mutual Events, Close Approaches of Saturn's Moons
As Saturn's rings narrow, now's the time for its moons to shine.
Earth's New Temporary Mini-moon Arrives This Weekend
Starting September 29th, another moon of sorts will briefly accompany Earth. The house-size asteroid will stick around less than 2 months.
Did a Ring of Rocks and Dust Orbit Earth Before the Dinosaurs Roamed?
A team of scientists thinks a clustering of ancient impact craters points to a temporary ring around Earth hundreds of millions of years ago.
Tiny Glass Beads Reveal Signs of Recent Volcanism on the Moon
Glass beads in samples from China’s Chang’e 5 mission show that volcanic eruptions occurred on the Moon within the past 120 million years or so.
Jupiter’s Moon Io Has a Giant New Volcano
NASA’s Juno mission has spotted a new volcano on Jupiter’s pockmarked moon, Io.
Solar Probe Duo Unravel Solar Wind Mystery
For decades, scientists have wondered what accelerates solar wind particles as they move away from the Sun. New evidence points to magnetic switchbacks.
