Comet ISON is teasing the solar system as it dances with the sun and it's giving astronomers mixed signals.
Scientists witness biggest, brightest cosmic explosion ever seen.
Rocket streaks through night sky in East as NASA puts smartphone, other satellites into orbit.
A new, smaller version of NASA's space shuttle is recuperating from a rough first landing.
A new commercial spaceship will wait all week before aiming again for the International Space Station.
Orbital Sciences Corp. says everything looks good for launch from Virginia's Eastern Shore.
Drones will help scientists understand more about how tropical storms intensify.
NASA officials say brilliant lights came from a meteor.
Astronauts traveling to and from Mars get a dose that is enough to raise their cancer risk by about 3 percent.
