Watch private Ax-3 astronauts return to Earth in SpaceX capsule on Feb. 9 (video)

SpaceX launches NASA's PACE satellite to study Earth's oceans, air and climate (video)

What turned Earth into a giant snowball 700 million years ago? Scientists now have an answer: All-time low volcanic carbon emissions triggered a 57-million-year-long global ice age

Ax-3 Astronauts Undock From Space Station in SpaceX Dragon for Earth Return