On Saturday night at 9:30 p.m. ET, an alarm clock went off for NASA’s New Horizon probe, 2.9 billion miles away from Earth. At 9:52 p.m., the piano-size spacecraft sent a message back to Johns Hopkins Applied Physics Laboratory saying it was awake and all systems were functioning.
Astronomers attending an international summit in Prague plan to vote next week on a new classification of Pluto-like objects that will redefine the solar system. Experts discuss the proposed solution to the long-standing debate over whether Pluto is a planet. Continue reading