61–80 of 949 results
Comet Borisov

Solar System

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.

Apophis radar images in 2021

Solar System

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.

Great Red Spot vs. flake

Solar System

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.

The loss of water on Mars

Solar System

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.

Portrayal of 'Oumuamua (1I/2017 U1)

Solar System

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.

Near-Earth asteroid passing Earth

Solar System

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 light

Solar System

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.

Mars North Pole

Spacecraft and Space Missions

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.

Apophis and Earth in 2029

Solar System

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.

Battered Vesta

Celestial Objects to Observe

March — A Good Time to Visit Vesta

Dip into this easy guide to seeing the brightest asteroid, Vesta, and understanding what makes it unique.

Mars water map

Solar System

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.

Perseverance during descent

Solar System

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.

Exomars Trace Gas Orbiter

Solar System

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.

Solar eruption

Solar System

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.

2020 XL5 orbit

Solar System

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.

Daytime planet fest

Explore the Night with Bob King

Planets and Comets Can't Hide from SOHO's Eye

With the help of the Solar Heliospheric Observatory you can not only keep track of the planets in the daytime sky but maybe even discover a comet.

Artist’s impression of the Ulysses spacecraft

Stellar Science

Measuring Solar Eruptions with a Rare Alignment

New analysis of a coronal mass ejection detected by the alignment of two spacecraft reveals that it experienced erosion and restructuring as it traveled.

Comet 67P/Churyumov-Gerasimenko

Celestial Objects to Observe

Comet Watch 2021

If you own an 8-inch or larger telescope you might see more than a dozen new and returning comets this year, including one potential naked-eye candidate.

Lost Jovian moon J 23

Solar System

Amateur Astronomer Finds “Lost” Moons of Jupiter

An amateur astronomer has recovered four of five "lost" Jovian moons.

Sunspot, in detail

Solar System

Will the Next Solar Cycle Surprise Us?

The coming months will test a new prediction that — contrary to most expectations — forecasts one of the strongest sunspot cycles on record.

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