About 84 million years ago, Earth's crust and the mantle below it rotated around the planet's inner core - causing the Earth to tip over.
  • Business Insider
  • Jun 19, 2021

Earth tipped over on its side 84 million years ago and then righted itself, new study finds - Yahoo News

A photo of Earth taken by NASA's Earth Polychromatic Imaging Camera (EPIC). Reuters/NASA If you'd been able to stare at Earth from space during the late Cretaceous, when Tyrannosaurus rex and Tricer… [+3668 chars]

More In science

A major challenge to harvesting fusion energy on Earth - Phys.org
  • Phys.Org
  • Aug 06, 2021

A key challenge for scientists striving to produce on Earth the fusion energy that powers the sun and stars is preventing what are called runaway electrons, particles unleashed in disrupted fusion experiments that can bore holes in tokamaks, the doughnut-shap…...