deep space

Harvard researchers say a comet from deep space — not an asteroid from the belt past Mars — was responsible for the mass extinction. Others are skeptical.

In what NASA is calling "HERstory" in space, Christina Koch and Jessica Meir stepped outside the International Space Station on Friday to replace a bad battery charger.

NASA could miss a 2024 deadline set by the White House to land humans on the moon. Funding is at the heart of the delay.The Trump administration wants to…

Scientists have discovered a planet outside our solar system that contains signs of water — a key resource needed to support life.The planet, named…

Sixty feet beneath the water’s surface in the Florida Keys National Marine Sanctuary sits one of the world’s three undersea research laboratories.And as…