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moons

A cratered planet and its smaller moon appear silhouetted against a dark background.
Posted inNews

Marauding Moons Spell Disaster for Some Planets

Katherine Kornei, Science Writer by Katherine Kornei 6 March 20236 March 2023

In solar systems beyond our own, some moons might eventually collide with their host planets, new simulations suggest.

An artist’s illustration of a brownish orb in front of a background of white stars. A ring made up of small gray pieces of debris surrounds the orb. To the left of the planet is a smaller brownish orb. To the right is a bright star.
Posted inNews

Quaoar’s Ring Defies Gravity

Kimberly M. S. Cartier, News Writing and Production Intern for Eos.org by Kimberly M. S. Cartier 3 March 202315 March 2023

The dwarf planet’s ring makes astronomers question whether a long-held theory about ring and moon formation needs tweaking.

Graphs showing the interior evolution of Miranda diverging from that of Ariel.
Posted inEditors' Highlights

What Surprises do the Icy Uranian Moons Hold?

by Kelsi Singer 22 February 202317 February 2023

With efforts ramping up to send a spacecraft back to the Uranian system, anticipation is increasing as to what geological surprises are hiding inside and on the surfaces of the icy Uranian moons.

Illustration of NASA’s Cassini spacecraft diving through the plume of Saturn’s moon Enceladus in 2015
Posted inFeatures

Marine Science Goes to Space

Damond Benningfield, Science Writer by Damond Benningfield 4 January 20234 January 2023

Space and ocean scientists take a splash course in multidisciplinary science to chart our solar system’s ocean worlds.

Diagram showing the molecular hydrogen in Callisto’s atmosphere.
Posted inEditors' Highlights

Callisto’s H Corona: Offspring of the Surface or the Atmosphere?

by Beatriz Sanchez-Cano and Anni Määttänen 7 December 202219 January 2023

The mostly unknown Callisto’s H corona is created by a global tenuous H2 atmosphere and not by surface water as previously believed, providing the first evidence for H2 in Callisto’s atmosphere.

Spacecraft view of the surface of Jupiter’s moon Europa showing a complex pattern of ridges and bands.
Posted inResearch Spotlights

Europa’s Plate Tectonic Activity Is Unlike Earth’s

by Morgan Rehnberg 29 November 202227 January 2023

The moon of Jupiter has likely experienced intermittent, regional plate tectonic activity in the past, although the plates are currently dormant.

The orange moon Titan passes in front of the striped disk of the planet Saturn, with Saturn’s rings seen edge on, forming a thin line between the moon and planet.
Posted inNews

Long-Gone Moon Could Explain Birth of Saturn’s Rings

Damond Benningfield, Science Writer by Damond Benningfield 20 October 202220 October 2022

Named Chrysalis, the moon could have disintegrated during a close encounter with the gas giant roughly 100 million years ago.

Half of Jupiter’s moon Europa seen from space
Posted inResearch Spotlights

Zipping Up Data to Zap It Back from an Icy Moon

Sarah Derouin, Science Writer by Sarah Derouin 19 October 202219 October 2022

NASA wants to send instruments to distant moons like Europa and Enceladus to search for life. But getting vital data back to Earth over limited bandwidth will take some impressive compression software.

NASA的卡西尼号宇宙飞船捕捉到了位于木星前面的木卫二。
Posted inResearch Spotlights

海洋世界的动力可能受旋转控制

by Morgan Rehnberg 27 July 202227 July 2022

新的模拟结果表明,在自然罗斯比数较小的冰卫星上的地下海洋可能主要受到旋转效应的影响。

Europa situated in front of Jupiter.
Posted inResearch Spotlights

Dynamics of Ocean Worlds Likely Controlled by Their Rotation

by Morgan Rehnberg 9 May 202227 July 2022

New simulations suggest that subsurface oceans on icy moons with small natural Rossby numbers may be dominated by rotational effects.

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By Luke C. Skinner and Edouard Bard

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