NASA's TESS spacecraft is officially up and running. The agency recently announced that TESS, which stands for Transiting Exoplanet Survey Satellite, started its search for exoplanets -- planets outside of our solar system -- on July 25th. Its first data transmission is scheduled for August. "I'm thrilled that our new planet hunter mission is ready to start scouring our solar system's neighborhood for new worlds," Paul Hertz, director of the Astrophysics Division of NASA's Science Mission Directorate, said in a statement. "Now that we know there are more planets than stars in our universe, I look forward to the strange, fantastic worlds we're bound to discover."