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Explanation: Sweeping through northern predawn skies, on November 24 Comet Leonard (C/2021 A1) was caught between two galaxies in this composite telescopic image. Sporting a greenish coma the comet's dusty tail seems to harpoon the heart of NGC 4631 (top) also known as the Whale Galaxy. Of course NGC 4631 and NGC 4656 (bottom, aka the Hockey Stick) are background galaxies some 25 million light-years away. On that date the comet was about 6 light-minutes from our fair planet. Its closest approach to Earth (and even closer approach to Venus) still to come, Comet Leonard will grow brighter in December....

Comet Leonard, also known as C/2021, will make its closest approach to Earth on Dec. 12, according to NASA. EarthSky describes C/2021 A as “likely to be 2021’s best comet, and its brightest comet by year’s end.” Leonard is actually already visible in the sky and can be seen the first two weeks of December in the east before the sun rises. NASA says you can spot it by looking between the Big Dipper’s handle and Arcturus, the latter of which is one of the brightest stars in the night sky. Then, as Leonard makes its closest encounter with our...