While the mantle is mostly solid, a layer about 93 miles (150 kilometers) down is melty, new research finds.
A report from the conservation group NatureServe warns that 40% of animals and 34% of plants in the U.S. are "at risk" of extinction.
A great white shark recently decapitated a Mexican fisher as he was diving for shellfish. But what was the reason for the unusually gruesome attack?
The light from the distant Sparkler galaxy was spotted in the James Webb Telescope's First Deep Field and could teach us how our own Milky Way devoured other galaxies to grow.