Ultima Thule Posted on 2018/12/19 by Carl Robitaille Flyby de New Horizons le premier janvier 2019. Just what is #UltimaThule? A) A little-known building block of our solar systemB) A Kuiper belt objectC) The Jan. 1 flyby target for @NASANewHorizonsIf you picked "all of the above," well done! 🌟 Send us #askNASA questions now on Facebook Live: https://t.co/KKGXt7aMeg pic.twitter.com/rWia1yH6Fm— NASA (@NASA) December 19, 2018