                        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.

                                2026 July 16
    A bright spiral galaxy shows stars and colorful clous of gas in red,
       green and blue colors. The background is a dark field of stars.

            NGC 300: A Cosmic Gemstone with Stars and Gas Clouds
                 Image Credit & Copyright: Team Ciel Austral
             Text: Cecilia Chirenti (NASA GSFC, UMCP, CRESST II)

   Explanation: This sparkling, colorful gemstone is a spiral galaxy, NGC
   300. It is one of the closest spiral galaxies to Earth, only about 6
   million light-years away. But does it really look like this? Here is a
   more standard portrait of it. This unusual image combines the light
   from the stars and dust within the galaxy with the light from ionized
   clouds of interstellar gas shown in red (Sulphur), green (Hydrogen) and
   blue (Oxygen). Combining red and green light in different proportions
   makes yellow or orange light, most visible in the image. Light from
   other ionized gases is also at work in neon signs, fluorescent tubes
   and street lights. These massive clouds of ionized gas are typically
   created by young, massive stars that produce high-energy ultraviolet
   radiation capable of ionizing the gas. Massive stars are short-lived,
   compared with lighter stars like our sun, and explode as supernovas at
   the end of their lives. Some of the colorful clouds in the image could
   be hiding supernova remnants.

                      Tomorrow's picture: What's next?
     __________________________________________________________________

       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.

