For practical purposes, we say that one day—the time it takes for Earth to rotate once on its axis—equates to 24 hours. In ...

Billions of years ago, another planet smashed into Earth. An event of this epicness could have created our Moon. It also ...

Something unusual may be happening deep inside Earth. Experiments suggest that hydrogen can movefreely through solid iron under the crushing pressures and extreme temperatures of the inner core, ...

Add Yahoo as a preferred source to see more of our stories on Google. We see a. black hole illustration. It is surrounded by circles of blue and pink from its superheated accretion disc. To Earthlings ...

Add Yahoo as a preferred source to see more of our stories on Google. The slice you see cut out of the Earth reveals its core, depicted here in bright yellow. fhm/E+ via Getty Images Our Earth is ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. Radiation from the sun may not just affect our planet's surface, but ...

Scientists proposed a novel idea on Wednesday that could solve two of the world's mysteries at once—one that passes over our heads every night, and one that sits far below our feet. The first mystery ...

Earth and our entire Milky Way galaxy may sit inside a mysterious giant hole which makes the cosmos expand faster here than in neighbouring regions of the universe, astronomers say. Their theory is a ...

This article predates Brown Brothers Media’s ownership of Science Blog and has not been reviewed under our current editorial process. It is preserved as part of the publication’s archive. The primary ...

Helium-3, a rare isotope of helium gas, is leaking out of Earth's core, according to a new study. Because almost all helium-3 is from the Big Bang, the gas leak adds evidence that Earth formed inside ...

Billions of years ago, our solar system coalesced within an interstellar molecular cloud, a nursery made up of gas and dust that clumped together to form stars, asteroids, and planets—eventually, our ...

To Earthlings gazing into space, our solar system appears to be surrounded by billions of stars in the Milky Way. But if we look even further out, would it be possible to find evidence that we were in ...