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Exploration of the solar system began when early sky gazers looked up and saw planets in the sky. At first, they considered them deities, but that changed as people began using science to understand the planets.Today, astronomers use spacecraft and ground-based observatories to make discoveries in the solar system that would leave our ancestors' jaws dropping. Let's see what they've found. What are Planets? The solar system has four rocky planets (Mercury, Venus, Earth, and Mars), two gas giants (Jupiter and Saturn), two ice giants (Uranus and Neptune), and at least half a dozen confirmed or suspected dwarf planets. Pluto is the largest and most famous of them and was explored by the New Horizons mission in 2015. We say "at least" because, by some estimates many more small worlds that orbit the Sun just as other planets do. Most are beyond the orbit of Neptune, except for Ceres, which is the only dwarf in the inner solar system. The idea of "planet" has changed radically from the days of the ancients. Astronomers and planetary scientists are debating just what defines a planet, and the current "official" definition from the International Astronomical Union is not accepted by all scientists. The debate on what "planet" means continues as planetary scientists find more worlds in our solar system #Universe #Space #Documentary
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President Donald Trump (Alec Baldwin) takes questions at press conference. #SNL #DonCheadle #GaryClarkJr #SNL44 Subscribe to SNL: https://goo.gl/tUsXwM Get more SNL: http://www.nbc.com/saturday-night-live Full Episodes: http://www.nbc.com/saturday-night-liv... Like SNL: https://www.facebook.com/snl Follow SNL: https://twitter.com/nbcsnl SNL Tumblr: http://nbcsnl.tumblr.com/ SNL Instagram: http://instagram.com/nbcsnl SNL Pinterest: http://www.pinterest.com/nbcsnl/
Kendall Jenner and Jimmy take turns guessing which random objects are real and which are objects made out of food by taking a bite out of them in a Japanese game show-inspired competition. Subscribe NOW to The Tonight Show Starring Jimmy Fallon: http://bit.ly/1nwT1aN Watch The Tonight Show Starring Jimmy Fallon Weeknights 11:35/10:35c Get more Jimmy Fallon: Follow Jimmy: http://Twitter.com/JimmyFallon Like Jimmy: https://Facebook.com/JimmyFallon Get more The Tonight Show Starring Jimmy Fallon: Follow The Tonight Show: http://Twitter.com/FallonTonight Like The Tonight Show: https://Facebook.com/FallonTonight The Tonight Show Tumblr: http://fallontonight.tumblr.com/ Get more NBC: NBC YouTube: http://bit.ly/1dM1qBH Like NBC: http://Facebook.com/NBC Follow NBC: http://Twitter.com/NBC NBC Tumblr: http://nbctv.tumblr.com/ NBC Google+: https://plus.google.com/+NBC/posts The Tonight Show Starring Jimmy Fallon features hilarious highlights from the show including: comedy sketches, music parodies, celebrity interviews, ridiculous games, and, of course, Jimmy's Thank You Notes and hashtags! You'll also find behind the scenes videos and other great web exclusives. Food or Not Food with Kendall Jenner http://www.youtube.com/fallontonight #FallonTonight #KendallJenner #JimmyFallon
President Trump takes the urgency out of declaring a national emergency and turns an already bizarre press conference into a full-blown sing-along. Subscribe to The Daily Show: https://www.youtube.com/channel/UCwWhs_6x42TyRM4Wstoq8HA/?sub_confirmation=1 Follow The Daily Show: Twitter: https://twitter.com/TheDailyShow Facebook: https://www.facebook.com/thedailyshow Instagram: https://www.instagram.com/thedailyshow Watch full episodes of The Daily Show for free: http://www.cc.com/shows/the-daily-show-with-trevor-noah/full-episodes Follow Comedy Central: Twitter: https://twitter.com/ComedyCentral Facebook: https://www.facebook.com/ComedyCentral Instagram: https://www.instagram.com/comedycentral About The Daily Show: Trevor Noah and The World's Fakest News Team tackle the biggest stories in news, politics and pop culture. The Daily Show with Trevor Noah airs weeknights at 11/10c on Comedy Central.