“We’re made of star stuff,” astronomer Carl Sagan famously said. Nuclear reactions that happened in ancient stars generated much of the material that makes up our bodies, our planet and our solar system. When stars explode in violent deaths called supernovae, those newly formed elements escape and spread out in the universe.
Watch as NASA holds a news conference at its Washington, D.C. headquarters to provide a preview of its OSIRIS-REx mission to asteroid Bennu and back. The mission is scheduled to launch on 8 September, reach the asteroid in 2018, capture a sample of the celestial body in 2020 and bring the specimen back to Earth in a special landing capsule in 2023.