Samples sent back to Earth might help solve the mystery.
NASA chooses four potential asteroid sample sites for OSIRIS-REx
Asteroid Bennu's rocky surface made it challenging for NASA to find suitable sites.
NASA reveals Bennu asteroid is spewing particles into space
Images from the OSIRIS-REx mission change what we know about asteroids.
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NASA's OSIRIS-REx has started orbiting asteroid Bennu
The asteroid is now the smallest celestial body orbited by a spacecraft.
OSIRIS-REx spacecraft already found water on its target asteroid
NASA's explorer could provide insights into the early Solar System.
NASA’s OSIRIS-REx spacecraft has arrived at the asteroid Bennu
Its mission is to collect a surface sample and return it to Earth.
After Math: To all the turkeys I loved before
If you're just now rousing from your food coma, know that it's already Sunday and you have work tomorrow.
NASA successfully tests OSIRIS-REx robotic arm ahead of arrival
The spacecraft is scheduled to reach its destination December 3rd.
A portrait of Earth and the Moon from 3 million miles away
'Asteroid Day' is a good time to learn about the threat of space rocks
We only know of around one percent of the asteroids lurking in our solar system
