Sedna

Cosma / Communication / Knowledge / Realm / Physical / Universe / Solar System / Scattered Disc / Sedna
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Introduction1

Encyclopedia

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)

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Preservation

History

Sedna (Mike Brown, CalTech
Mike Brown (CalTech)
Michael E. Brown (Wikipedia)

Library

WorldCat, Library of Congress, UPenn Online Books, Open Library

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Participation

Education

MERLOT: Multimedia Educational Resource for Learning and Online Teaching
OER Commons: Open Educational Resources

Organization

Minor Planet Center (International Astronomical Union)

News

Sedna (Astronomy Magazine)
Sedna (Phys.org)
Sedna (NPR Archives)

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More…

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

  • 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 11:13 am

    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 […]

  • Astronomers confirm orbit of most distant object...
    on February 10, 2021 at 7:00 pm

    A team of astronomers, including associate professor Chad Trujillo of Northern Arizona University's Department of Astronomy and Planetary Science, have confirmed a planetoid that is almost four times farther from the Sun than Pluto, making it the most distant object ever observed in our solar system. The planetoid, which has been nicknamed "Farfarout," was first detected in 2018, and the team has now collected enough observations to pin down its orbit. The Minor Planet Center has now given it […]

  • NASA's Webb to examine objects in the graveyard...
    on October 29, 2020 at 1:04 pm

    Beyond the orbit of Neptune, a diverse collection of thousands of dwarf planets and other relatively small objects dwells in a region called the Kuiper Belt. These often-pristine leftovers from our solar system's days of planet formation are called Kuiper Belt objects, or trans-Neptunian objects. NASA's upcoming James Webb Space Telescope will examine an assortment of these icy bodies in a series of programs called Guaranteed Time Observations shortly after its launch in 2021. The goal is to […]

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Related

Here are links to pages about closely related subjects.

Knowledge Realm

Physical

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

“Space”
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

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Notes

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