SUNSET: 
NASA's OSIRIS-REX Leaves Asteroid Bennu, Heads for Home
NASA’s asteroid explorer has begun its long journey home with precious cargo onboard: samples of the asteroid Bennu.
Water-Ice Clouds Could Have Warmed Early Mars
New simulations show that the greenhouse effect of high water-ice clouds could have warmed early Mars, permitting the presence of long-ago lakes.
The Hubble Space Telescope As Cosmic-Ray Detector
Astronomers, using Hubble Space Telescope as a particle detector, have traced cosmic rays flowing in Earth's geomagnetic field.
Ingenuity Mars Helicopter: First Flight on Mars
NASA’s Ingenuity Mars Helicopter has made its brief hop into the history books of interplanetary aviation.
Make the Most of Comet ATLAS
Bright comets will be scarce this year, but you can see one of the better ones this month as it races from Aquila to Canes Venatici. In other news, a new, bright nova has flared in Sagittarius.
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.
Asteroid Apophis Will Miss Earth in 2068
Radar measurements taken early this month rule out any chance of a collision with Apophis over the next 100 years.
Jupiter's Great Red Spot Gets Smaller — But Stronger
"Flakes" coming off the Great Red Spot have had some wondering if this epic storm is coming to an end. But observations and computer modeling show it's only getting stronger.
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.
Can We Expect Seven Interstellar Visitors Per Year?
A new study estimates the number of interstellar objects that fly through the inner solar system every year, and it could be quite a lot.
Karma Asteroid Family Might Be Sending Members Near Earth
New simulations have identified the Karma family of asteroids in the main belt as a potential source of near-Earth asteroids.
Zodiacal Dust Seen from Earth Might Come from Mars
Much of the solar system’s interplanetary dust — seen as zodiacal light from Earth — might come from Mars.
See the Latest Stunning Images from Mars
NASA's Perseverance rover, China's Tianwen 1, and the United Arab Emirates' Hope orbiter share their latest photos from Mars.
Asteroid Apophis Pays Earth a Visit This Week
When a potentially hazardous asteroid glides safely past Earth on March 6th, astronomers will conduct a dress rehearsal for a dramatic close-miss pass in 2029.
March — A Good Time to Visit Vesta
Dip into this easy guide to seeing the brightest asteroid, Vesta, and understanding what makes it unique.
New Map of Ice on Mars Will Aid Future Crewed Missions
Scientists have made a new and improved map of possible water-ice reservoirs on Mars.
NASA’s Perseverance Arrives on Mars
NASA’s Perseverance rover, now safely on the floor of Jezero crater, will soon begin its search for evidence of past life on Mars.
Chlorine and Water Are in the Air in Martian Summertime
Two studies of the Martian atmosphere are changing the way we think about its current climate and its ancient past.
Tree Rings Help Reconstruct a Millennium of the Sun's Activity
Astronomers are using tree rings as a historical record of solar activity — and they've found that the Sun was much more active in the past.
Second Earth Trojan Asteroid Discovered
A recently discovered asteroid appears to be an Earth Trojan, orbiting a gravitationally stable area with only one other known occupant.
