BREAKING…Signal has just been received at mission control, New Horizons has successfully started its flyby program of stored commands and the exploration of Ultima Thule 4 billion miles away! THIS IS IT FOLKS, FLYBY HAS BEGUN! Go New Horizons!! #NASA #Science #SPACE#ULTIMAFLYBY pic.twitter.com/48VuCLHz5i

— Alan Stern (@AlanStern) December 25, 2018