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                           Astronomy Picture of the Day   
      
       Discover the cosmos! Each day a different image or photograph of our   
         fascinating universe is featured, along with a brief explanation   
                       written by a professional astronomer.   
      
                                 2021 November 30   
      
                            In Motion: Uranus and Moons   
           Video Credit: David Campbell (U. Hertfordshire), Bayfordbury   
                                    Observatory   
      
      Explanation: What's that moving across the sky? A planet just a bit too   
      faint to see with the unaided eye: Uranus. The gas giant out past   
      Saturn was tracked earlier this month near opposition -- when it was   
      closest to Earth and at its brightest. The featured video captured by   
      the Bayfordbury Observatory in Hertfordshire, UK is a four-hour   
      time-lapse showing Uranus with its four largest moons in tow: Titania,   
      Oberon, Umbriel and Ariel. Uranus' apparent motion past background   
      stars is really dominated by Earth's own orbital motion around our Sun.   
      The cross seen centered on Uranus is called a diffraction spike and is   
      caused by light diffracting around the four arms that hold one of the   
      telescope's mirrors in place. The rotation of the diffraction spikes is   
      not caused by the rotation of Uranus but, essentially, by the rotation   
      of the Earth. During the next few months Uranus itself will be visible   
      with binoculars, but, as always, to see its moons will require a   
      telescope.   
      
                      Tomorrow's picture: the blood moon band   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                         A service of: ASD at NASA / GSFC   
                                & Michigan Tech. U.   
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