Many exoplanets, including hot-Jupiters, have been observed to orbit the star the wrong way round, in retrograde orbits relative to the star's rotation. Prof. Smadar Naoz from UCLA visited the Cool Worlds Lab and explained why this is so odd and how we might explain these bizarre observation. ::More about this Video:: ► Prof Smadar Naoz homepage: http://www.astro.ucla.edu/~snaoz/ ► Simulation video of planet-planet scattering, credit Trent Schindler / National Science Foundation: http://www.berkeley.edu/news/media/releases/2005/04/13_planet.shtml ► Galaxy simulation (showing conservation of angular momentum) by Rob Crain (Leiden) and the Virgo Consortium, visualization by Rob Crain (Leiden) and Jim Geach (Hertfordshire) ► Outro music by Taylor Davis: https://www.youtube.com/watch?v=dl9kI1yQKZk ::Playlists For Channel:: Latest Cool Worlds Videos ► http://bit.ly/NewCoolWorlds Cool Worlds Research ► http://bit.ly/CoolWorldsResearch Guest Videos ► http://bit.ly/CoolWorldsGuests Q&A Videos ► http://bit.ly/CoolWorldsQA Science of TV/Film ► http://bit.ly/ScienceMovies ::Follow us:: SUBSCRIBE to the channel http://bit.ly/CoolWorldsSubscribe Cool Worlds Lab http://coolworlds.astro.columbia.edu Twitter https://twitter.com/david_kipping Instagram https://www.instagram.com/cool.worlds THANKS FOR WATCHING!!