Solar System | Astronomy.com

‘Dark comets’ could reveal how Earth got its oceans

Alison Klesman — Fri, 27 Dec 2024 20:35:50 +0000

The water that makes up the oceans acted as a key ingredient for the development of life on Earth. However, scientists still do not know where the water here on Earth came from in the first place. One leading idea is that space rocks such as comets and asteroids delivered water to the Earth throughContinue reading "‘Dark comets’ could reveal how Earth got its oceans"

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Mars Express captures the beauty of a martian frostscape

Samantha Hill — Tue, 24 Dec 2024 08:00:00 +0000

Although these frosty fields look like a picturesque winter wonderland blanketed in snow, this ice is actually composed of frozen carbon dioxide over the southern Australe Scopuli region of Mars. The European Space Agency’s (ESA) Mars Express spotted this scene using its High Resolution Stereo Camera (HRSC) during its 23,324th orbit of the Red Planet.Continue reading "Mars Express captures the beauty of a martian frostscape"

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How do spacecraft avoid collisions in the asteroid belt?

Astronomy Staff — Mon, 23 Dec 2024 19:00:00 +0000

How do spacecraft avoid collisions when passing through the asteroid belt? Val-David SmithsonPleasant Grove, Utah Let’s begin by reviewing some astronomical “history”: Han Solo and his rebel cohorts Leia Organa, Chewbacca, and C-3PO are nestled uncomfortably together in the Millennium Falcon’s cockpit while their ship is pursued by a battalion of Imperial fighters. Unable toContinue reading "How do spacecraft avoid collisions in the asteroid belt?"

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Smallest main-belt asteroids ever detected found hiding in JWST data

Samantha Hill — Mon, 23 Dec 2024 12:00:00 +0000

Over the past 200 years, astronomers have cataloged over a million asteroids in the solar system’s main belt, down to the size of around a kilometer in diameter. But smaller asteroids were elusive — until recently, when a team of scientists utilized data from the James Webb Space Telescope (JWST) to spot some tiny asteroidsContinue reading "Smallest main-belt asteroids ever detected found hiding in JWST data"

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Io’s magma ocean may not exist after all

shill — Fri, 20 Dec 2024 12:11:50 +0000

Plenty of worlds in our solar system have oceans — and not all of them are made of water. Io, Jupiter’s innermost moon, was purported to have one made of basalt and bits of sulfur just under its surface, powering its volcanic eruptions. But according to a study published in Nature last week, a globalContinue reading "Io’s magma ocean may not exist after all"

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Earth’s gravity gave the Moon an early facelift

Robert Reeves — Wed, 18 Dec 2024 17:32:58 +0000

Earth and the Moon are forever locked in a gravitational embrace that has played a critical role in determining the fate of both worlds. Although they have grown more distant since their formative years, new research published today in Nature shows just how powerful their attraction was in their youth: According to the study, Earth’sContinue reading "Earth’s gravity gave the Moon an early facelift"

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Why the winter solstice is the longest night every year, and when it happens in 2024

Richard Talcott — Tue, 17 Dec 2024 20:40:09 +0000

Winter does not officially arrive until the solstice. The 2024 winter solstice — the precise moment when the Sun appears farthest south in the sky — is at 4:21 a.m. Eastern Standard Time (EST) on Saturday, Dec. 21, in the Northern Hemisphere, according to the U.S. Naval Observatory. Throughout the Northern Hemisphere, the day ofContinue reading "Why the winter solstice is the longest night every year, and when it happens in 2024"

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What’s in the National Academies’ Decadal Survey for Solar and Space Physics?

Christopher Cokinos — Fri, 13 Dec 2024 14:00:00 +0000

At its current solar maximum, our Sun has been pretty busy of late, flinging parts of itself at Earth and raising concerns about effects on satellites and power grids while also gracing us with incredible aurorae. Solar and space-weather scientists have been busy too. They’ve just released a mammoth, nearly 800-page report to set prioritiesContinue reading "What’s in the National Academies’ Decadal Survey for Solar and Space Physics?"

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NASA conducts first otherworldly aircraft accident investigation

Mark Zastrow — Thu, 12 Dec 2024 22:28:08 +0000

The National Transportation Safety Board (NTSB) and FAA oversee investigations of aircraft accidents in U.S. airspace. But what happens when a crash occurs hundreds of millions of miles away in outer space? Engineers with NASA’s Jet Propulsion Laboratory (JPL) in California and uncrewed aircraft systems (UAS) manufacturer Aerovironment, a prominent aerospace and defense contractor, areContinue reading "NASA conducts first otherworldly aircraft accident investigation"

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The Moon as it never was

Klaus R. Brasch — Mon, 09 Dec 2024 14:00:00 +0000

In 1874, James Nasmyth and James Carpenter published a remarkable book: The Moon: Considered as a Planet, a World, and a Satellite. Lavishly illustrated with spectacular images of lunar features based on their own observations and exquisite plaster models, it served as a platform for the authors to advance their views on the nature andContinue reading "The Moon as it never was"

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