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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.

                                 2025 June 4
   A large telescope appears on the left. The band of our Milky Way Galaxy
   extends from the telescope to the upper right of the image. The horizon
       has a slight glow. Please see the explanation for more detailed
                                information.

                    A Milky Road to the Rubin Observatory
    Image Credit: NSF, DOE, Rubin Obs., Paulo Assun+º+úo Lago (Rubin Obs.)

   Explanation: Is the sky the same every night? No -- the night sky
   changes every night in many ways. To better explore how the night sky
   changes, the USA's NSF and DOE commissioned the Vera C. Rubin
   Observatory in Cerro Pach+|n, Chile. In final testing before routine
   operations, Rubin will begin to explore these nightly changes -- slight
   differences that can tell us much about our amazing universe and its
   surprising zoo of objects. With a mirror over 8 meters across, Rubin
   will continually reimage the entire visible sky every few nights to
   discover new supernovas, potentially dangerous asteroids, faint comets,
   and variable stars -- as well as mapping out the visible universe's
   large-scale structure. Pictured, the distant central band of our Milky
   Way Galaxy appears to flow out from the newly operational observatory.
   Taken last month, the featured picture is a composite of 21 images
   across the night sky, capturing airglow on the horizon and the Small
   Magellanic Cloud galaxy on the lower left.

         APOD Turns 30!: Free Public Lecture in Anchorage on June 11
                       Tomorrow's picture: open space
     __________________________________________________________________

       Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
            NASA Official: Amber Straughn Specific rights apply.
                  NASA Web Privacy, Accessibility, Notices;
                      A service of: ASD at NASA / GSFC,
                           NASA Science Activation
                             & Michigan Tech. U.

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