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  • Comets - Science@NASA
    Comets are cosmic snowballs of frozen gases, rock, and dust that orbit the Sun When frozen, they are the size of a small town
  • Comet Facts - Science@NASA
    Introduction In the distant past, people were both awed and alarmed by comets, perceiving them as long-haired stars that appeared in the sky unannounced and unpredictably Chinese astronomers kept extensive records for centuries, including illustrations of characteristic types of comet tails, times of cometary appearances and disappearances, and celestial positions These historic comet annals
  • Comet 3I ATLAS - NASA Science
    NASA missions are working together to track and study this rare, interstellar comet as it passes through our solar system
  • Comet 2I Borisov - NASA Science
    Comet 2I Borisov is the first confirmed interstellar comet It was discovered by Crimean amateur astronomer Gennady Borisov on Aug 30, 2019
  • Oumuamua - NASA Science
    The first known interstellar object to visit our solar system, 1I 2017 U1 ‘Oumuamua, was discovered Oct 19, 2017
  • Comet Tsuchinshan-ATLAS Arrives from Afar - NASA Science
    A “dirty snowball” from the distant icy cloud encircling our solar system passed by the Sun and Earth in autumn 2024
  • About the Planets - Science@NASA
    Our solar system has eight planets, and five dwarf planets - all located in an outer spiral arm of the Milky Way galaxy called the Orion Arm
  • Hubble Multimedia - NASA Science
    Download Hubble e-books, images, fact sheets, and lithographs Play Hubble games Watch Hubble videos Listen to Hubble sonifications
  • Oort Cloud - Science@NASA
    The Oort Cloud lies far beyond Pluto and the most distant edges of the Kuiper Belt Scientists think the Oort Cloud is a giant spherical shell surrounding the Sun, planets and Kuiper Belt Objects It's like a big, thick bubble around our solar system, made of icy, comet-like objects
  • Stardust Stardust NExT - NASA Science
    What was Stardust Stardust NExT? NASA's Stardust was the first spacecraft to bring samples from a comet to Earth, and the first NASA mission to return particles from beyond the Earth Moon orbit





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