Search results for dynamo theory

Astronomy Apr 27, 2026

Why stars spin down, or up, before they die

From birth to death, stars generally slow by 100 to 1,000 times their initial rotation rates; in other words, they "spin down." The sun's total angular momentum has declined as material is gradually blown off at the surface ...

Earth Sciences Mar 19, 2026

How our planet's history was shaped when the Earth moved

The history of Earth is written on the great tablets of tectonic plates. The motions of plates shaped land masses, formed oceans, and created the varied climates and habitats that set the stage for evolution and the diversity ...

Astronomy Mar 18, 2026

How young galaxies grew magnetic fields faster than expected

How fast can a galaxy build ordered magnetic fields spanning thousands of light-years? Existing theories say several billion years, but observations of galaxies in our universe imply shorter timescales. In a study published ...

Planetary Sciences Feb 25, 2026

Apollo moon rocks reveal lunar magnetic field was briefly stronger than Earth's

Researchers from the Department of Earth Sciences, University of Oxford, have resolved a long-standing debate about the strength of the moon's magnetic field. For decades, scientists have argued about whether the moon had ...

Planetary Sciences Feb 3, 2026

Reading the moon's diary, one speck of dust at a time

Magnetism on the moon has always been a bit confusing. Remote sensing probes have noted there is some magnetic signature, but far from the strong cocoon that surrounds Earth itself. Previous attempts to detect it in returned ...

General Physics Jan 21, 2026

Velocity gradients prove key to explaining large-scale magnetic field structure

All celestial bodies—planets, suns, even entire galaxies—produce magnetic fields, affecting such cosmic processes as the solar wind, high-energy particle transport, and galaxy formation. Small-scale magnetic fields are generally ...

Other Jan 17, 2026

Saturday Citations: Super-Earths; superagers; how we grieve pets

This week, a new analysis of Jupiter's atmosphere estimated that the gas giant has 1.5 times more oxygen than the sun. Researchers in Brazil identified a protein that allows pancreatic cancer to infiltrate nerves and spread ...

Planetary Sciences Jul 30, 2025

Simulations prove early Earth's liquid core generated protective magnetic field

Earth is fortunate in having a magnetic field: it protects the planet and its life from harmful cosmic radiation. Other planets in our solar system—such as Mars—are constantly bombarded by charged particles that make life ...

Astronomy Jun 16, 2025

Simulation reveals emergence of jet from binary neutron star merger followed by black hole formation

Binary neutron star mergers, cosmic collisions between two very dense stellar remnants made up predominantly of neutrons, have been the topic of numerous astrophysics studies due to their fascinating underlying physics and ...

Astronomy Jun 2, 2025

Supercomputer simulation reveals how merging neutron stars form black holes and powerful jets

Merging neutron stars are excellent targets for multi-messenger astronomy. This modern and still very young method of astrophysics coordinates observations of the various signals from one and the same astrophysical source. ...

page 1 from 12