Our Earth’s atmosphere was not always the safe haven it is today. New research, informed by ancient ocean fossils, provides a glimpse into a time when our planet’s atmosphere was inhospitable and ...

Researchers investigated the Mesozoic Era's atmosphere and vegetation by studying oxygen isotopes in dinosaur tooth enamel. This is a replica of a Stan™ T. rex tooth. Photograph: Thomas Tütken.

Ever since its formation around 4.5 billion years ago, Earth's rotation has been gradually slowing down, and its days have ...

While Mars today only has a wispy remnant of an atmosphere, it may once have had one hundreds of times thicker with a ...

Impact history should be considered a key factor in the search for habitable Earth-like exoplanets. Southwest Research ...

New reconstructions of 540 million years of climate history show the planet tumbling between icehouse and hothouse states, revealing how rare and vulnerable our temperate moment is.

Our species likes it cold. Homo sapiens evolved in — and still inhabits — one of Earth’s rare and fragile ice ages, periods distinguished not by an abundance of saber-toothed cats and woolly mammoths ...

Scientists are steadily ruling out habitable conditions on the seven planets of the star Trappist-1. On one of the worlds, a ...