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unsolved mysteries

researchers-cliff-face-measure-rock-movement-precedes-rockfall
Posted inNews

A Warm Day Can Trigger Rockfalls

Lucas Joel by L. Joel 5 April 20163 November 2022

Research on a cliff face in Yosemite National Park finds that when rockfalls happen without an obvious cause, ordinary warming in the Sun could be the culprit.

Dipolarization fronts (DFs), bursty bulk flows (BBFs), flux transfer events (FTEs), and Kelvin-Helmholtz instability (KHI) in a high-resolution simulation of an idealized substorm.
Posted inScience Updates

Great Mysteries of the Earth's Magnetotail

by M. I. Sitnov, V. G. Merkin and J. Raeder 21 March 201618 July 2023

Workshop on Magnetotail Reconnection Onset and Dipolarization Fronts; Laurel, Maryland, 16–18 September 2015

Sea ice near West Greenland in summer 2014.
Posted inScience Updates

How Will Sea Ice Loss Affect the Greenland Ice Sheet?

by F. S. R. Pausata, A. N. LeGrande and W. H. G. Roberts 14 March 20166 March 2023

On the Puzzling Features of Greenland Ice-Core Isotopic Composition; Copenhagen, Denmark, 26–28 October 2015

Posted inResearch Spotlights

Magnetic Field Pulsations and Aurora Tightly Linked

by Mark Zastrow 12 February 201627 September 2022

Mysterious plasma waves from space are generating displays of aurora near Earth's poles.

Posted inNews

What Makes the Ground Suddenly Pop?

JoAnna Wendel, freelance science writer and illustrator by JoAnna Wendel 9 February 201630 September 2022

A geological feature in Michigan’s wooded Upper Peninsula has scientists scratching their heads.

Posted inNews

Proposed Planet Nine Elicits Cheers, Yawns, Hunt for Proof

by R. Cowen 4 February 201625 April 2023

Evidence of a large, unseen planet at the solar system's margins prompted a flurry of scientific paper downloads, as well as oodles of skepticism. There's no sighting yet of the purported body.

Posted inNews

What Caused the Sudden Heating of Uranus's Atmosphere?

JoAnna Wendel, freelance science writer and illustrator by JoAnna Wendel 13 January 201622 March 2023

A recently observed temperature reversal on Uranus may offer a clue to a long-standing mystery: Why are the upper atmospheres of gas giants so hot?

Posted inNews

Ancient Start of Animal Evolution Wasn't Delayed by Low Oxygen

Cody Sullivan by C. Sullivan 11 January 201614 March 2023

New research finds that Earth had sufficient oxygen 1.4 billion years ago for animals to evolve. Therefore, low oxygen levels probably didn't hold back evolution, as scientists have long thought.

Posted inNews

The Backwards Earthquakes

by E. E. A. Ross 15 December 20152 December 2022

Earthquakes in Idaho's panhandle are usually caused by the Earth's crust pulling apart. So why were earthquakes on 24 April pushing the crust together?

Posted inResearch Spotlights

Earth's Climate Cycles Might Have an Eccentric Explanation

by E. Betz 30 October 201517 August 2022

Mid-ocean ridge eruptions follow the cycles of tides and Earth's orbital eccentricity, indicating a possible role in long-term climate shifts.

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