A Billionaire Names His Team to Ride SpaceX, No Pros Allowed

Meet the four people who will take the first all-civilian rocket trip to orbit Earth. …

Hunting Ghost Particles Beneath the World’s Deepest Lake

A neutrino-spotting telescope beneath Russia’s frozen Lake Baikal in Russia is close to delivering scientific results…

An Astronaut's Heart Shrank From Space Travel, Study Finds

After almost a year in space, Scott Kelly’s heart diminished, but he remained reasonably fit. …

Glynn S. Lunney Dies at 84; Oversaw NASA Flights From Mission Control

He was hailed for leading the rescue of Apollo 13 astronauts when their spacecraft was rocked…

SpaceX Rocket Debris Seen Over Seattle and Portland, Astronomers Say

Astronomers said the objects were debris from a SpaceX rocket. Not everyone got the memo. …

The Most Intimate Portrait Yet of a Black Hole

Two years of analyzing the polarized light from a galaxy’s giant black hole has given scientists…

NASA's Mars Helicopter Prepares for Its First Flight

The experimental vehicle named Ingenuity traveled to the red planet with the Perseverance rover, which is…

NASA's Mars Helicopter Prepares for Its First Flight Date

The experimental vehicle named Ingenuity traveled to the red planet with the Perseverance rover, which is…

Oumuamua: It Came From Another Solar System

A piece of an extrasolar Pluto may have passed through our cosmic neighborhood, a new study…

The Water on Mars Vanished. This Might Be Where It Went.

Mars once had rivers, lakes and seas. Although the planet is now desert dry, scientists say…