(Phys.org) -- As NASA prepares for next week's Curiosity rover landing on Mars, William Shatner and Wil Wheaton share this thrilling story of NASA's hardest planetary science mission to date. The ...

(Phys.org) —Stars form as gravity coalesces the gas and dust in an interstellar cloud until the material develops clumps dense enough to become stars. Even after a star begins to burn its nuclear fuel ...