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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.   
      
                                  2023 February 1   
      An illustration showing what it might be like to look from the seventh   
      planet out from the star Trappist 1. A pillar of ice and rock stands in   
        a snow and ice covered landscape. A star surrounded by six planets   
        hangs high in the sky. Please see the explanation for more detailed   
                                   information.   
      
                          The Seventh World of Trappist-1   
                 Illustration Credit & Copyright: Michael Carroll   
      
      Explanation: Seven worlds orbit the ultracool dwarf star TRAPPIST-1. A   
      mere 40 light-years away, many of the exoplanets were discovered in   
      2016 using the Transiting Planets and Planetesimals Small Telescope   
      (TRAPPIST) located in the Atlas Mountains of Morocco, and later   
      confirmed with telescope including NASA's Spitzer Space Telescope. The   
      TRAPPIST-1 planets are likely all rocky and similar in size to Earth,   
      and so compose one of the largest treasure troves of terrestrial   
      planets ever detected around a single star. Because they orbit very   
      close to their faint, tiny star they could also have regions where   
      surface temperatures allow for the presence of ice or even liquid   
      water, a key ingredient for life. Their tantalizing proximity to Earth   
      makes them prime candidates for future telescopic explorations of the   
      atmospheres of potentially habitable planets. All seven exoplanets   
      appear in the featured illustration, which imagines a view from the   
      most distant known world of this system, TRAPPIST-1h, as having a rocky   
      landscape covered in ice. Meanwhile, in the imagined background, one of   
      the system's inner planets crosses in front of the dim, orange, nearly   
      Jupiter-sized parent star.   
      
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