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Sedna (minor-planet designation 90377 Sedna) is a dwarf planet in the outer reaches of the Solar System. Spectroscopy has revealed that Sedna’s surface composition is similar to those of some other trans-Neptunian objects, being largely a mixture of water, methane, and nitrogen ices with tholins. Its surface is one of the reddest among Solar System objects. — Wikipedia

Sedna (Encyclopædia Britannica)

Sedna (Wolfram Alpha)




Sedna (Mike Brown, CalTech)




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Sedna (Minor Planet Center, International Astronomical Union)
Asteroids & Remote Planets Section (British Astronomical Association)


Sedna (JSTOR)
TERM (EurekaAlert, AAAS)
Sedna (Astronomy Magazine)
Sedna (
Sedna (NPR Archives)


More … - latest science and technology news stories internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.

  • JWST observes the Kuiper Belt: Sedna, Gonggong,...
    on October 16, 2023 at 5:37 pm

    The Kuiper Belt, the vast region at the edge of our solar system populated by countless icy objects, is a treasure trove of scientific discoveries. The detection and characterization of Kuiper Belt Objects (KBOs), sometimes referred to as Trans-Neptunian Objects (TNOs), has led to a new understanding of the history of the solar system.

  • Whale dies after washing ashore in northern France
    on November 7, 2022 at 3:32 pm

    A 7.6-meter (25-foot) whale died on a beach in northern France on Monday, hours after being discovered washed up and alive but wounded, authorities said.

  • Researcher describes how extraterrestrial...
    on May 26, 2022 at 9:30 pm

    Astronomers have searched for extraterrestrial civilizations in planetary systems for sixty years, to no avail. In the paper published by International Journal of Astrobiology, Cambridge University Press, and titled "Migrating extraterrestrial civilizations and interstellar colonization: Implications for SETI and SETA," Irina K. Romanovskaya proposes that the search for extraterrestrial intelligence (SETI) may have more chances to become successful when including the search for migrating […]

  • Still searching for Planet 9
    on March 14, 2022 at 4:50 pm

    The solar system has eight planets. In 2006, astronomers reclassified Pluto as a dwarf planet, the same class that contains Eris, Sedna, Quaoar, Ceres and perhaps many more solar system small bodies. These are defined approximately as bodies that orbit the sun but that are not massive enough (unlike regular planets) to gravitationally dominate their environments by clearing away material. Astronomers wonder, though, whether there might not really be a ninth planet previously undiscovered but […]

  • 2029 will be the perfect year to launch a mission...
    on January 5, 2022 at 12:13 pm

    Object 90377 Sedna—a distant trans-Neptunian object known best for its highly elliptical, 11,390-year long orbit—is currently on its way toward perihelion (its closest approach to the sun) in 2076. After that, Sedna will swing out into deep space again and won't be back for millennia, making this flyby a once-in-a-lifetime (or, once in ~113 lifetimes) opportunity to study an object from the far reaches of our solar system. There are no missions to Sedna in the works just yet, but […]


Here are links to pages about closely related subjects.

Knowledge Realm


Law (Constant) Relativity
Force Gravity, Electromagnetism (Light, Color)
Matter (Microscope) Molecule, Atom (Periodic Table), Particle

Universe (Astronomical Instrument)
Galaxy Milky Way, Andromeda
Planetary System Star, Brown Dwarf, Planet, Moon

Our Neighborhood
Solar System Sun
Terrestrial Planet Mercury, Venus, Earth (Moon), Mars
Asteroid Belt Ceres, Vesta
Jovian Planet Jupiter, Saturn, Uranus, Neptune
Trans-Neptunian Object
Kuiper Belt Pluto, Haumea, Makemake
Scattered Disc Eris, Sedna, Planet X
Oort Cloud Etc. Scholz’s Star
Small Body Comet, Centaur, Asteroid


1.   The resources on this page are are organized by a classification scheme developed exclusively for Cosma.