Sound needs a medium (solid, liquid, or gas) to travel. Space is a vacuum, lacking the matter to carry sound waves. No sound in space means no echoes. While a near-perfect vacuum, some sounds can be ...

There’s a reason you feel amazing after a deep, full night of sleep. Not only is your body resting, but proper sleep also promotes brain health, helps your ability to fight infections, and leads to ...

Astronauts have been adjusting to the challenges of sleeping in space for years — and the lessons learned from their zero gravity slumbers will ensure that one day the first crewed missions to Mars ...