NASA to Air Northrop Grumman Cygnus Departure from Space Station

Former astronaut Pam Melroy sworn in as NASA deputy chief

NASA picks 3 new science experiments for commercial moon missions

The most extreme space weather occurs when the Sun blasts billions of tons of energized particles toward Earth at speeds up to 6.7 million mph (3,000 km/s). Known as coronal mass ejections, these explosions can cause intense geomagnetic storms, as well as negatively affect astronauts and spacecraft.