Rabinowitz, Schaefer, Tourtellotte, 2011. Anyway, this compassionate idealism channels down to Saturn at the apex of a Yod aspect pattern. The 10th brightest star in the sky is beta Centaurus, the fixed star Agena. Click on the image to view.  Stellar encounters during this time would have minimal effect on the Oort cloud's final mass and population since the Sun had excess material for replenishing the Oort cloud population. It is at present over 90 AUs away, 3 times as far as Pluto. Sedna is a solar system body that is one of the most distant bodies found in our solar system. We were evolving away from our nomadic roots. It's likely Sedna is a dwarf planet, but uncertain, because it's so far away and hard to measure.  No direct evidence of Nemesis has been found, and many lines of evidence (such as crater counts) have thrown its existence into doubt. Its surface is one of the reddest among Solar System objects. Astronomers have discovered a mysterious planet-like body in the distant reaches of the solar system. The discovery formed part of a survey begun in 2001 with the Samuel Oschin telescope at Palomar Observatory near San Diego, California, using Yale's 160-megapixel Palomar Quest camera. Another hypothesis suggests that its orbit may be evidence for a large planet beyond the orbit of Neptune. This puts it well beyond the Kuiper Belt and yet well inside what was thought to be the inner edge of the Oort Cloud. "The star would have been close enough to be brighter than the full moon, and it would have been visible in the daytime sky for 20,000 years," Brown explained. , Brown initially nicknamed Sedna "The Flying Dutchman", or "Dutch", after a legendary ghost ship, because its slow movement had initially masked its presence from his team.  It was calculated that a flyby mission to Sedna could take 24.48 years using a Jupiter gravity assist, based on launch dates of 6 May 2033 or 23 June 2046. Therefore, it must have been tugged into its current eccentric orbit by a gravitational interaction with another body. Left: Sedna lies farther from the sun than Pluto. Save my name, email, and website in this browser for the next time I comment.  Computer simulations by Julio A. Fernandez and Adrian Brunini suggest that multiple close passes by young stars in such a cluster would pull many objects into Sedna-like orbits.  In their initial paper, Brown, Rabinowitz and colleagues suggested three possible candidates for the perturbing body: an unseen planet beyond the Kuiper belt, a single passing star, or one of the young stars embedded with the Sun in the stellar cluster in which it formed. Weather and Atmospheric Dynamics Focus Area Publications and Research Highlights, Carbon Cycle and Ecosystems Focus Area Publications and Research Highlights, A Year in Review: New Earth Discoveries in 2018, Changes in global terrestrial water storage C, Climate change is speeding up the water cycle, Cold-intolerant plants are creeping farther north, Ice losses from Antarctica have tripled since 2012, India overtakes China as top emitter of sulfur dioxide, Linking ocean circulation and riverine carbon flux, Local land subsidence increases flood risk in San Francisco Bay, Satellites detect undiscovered penguin populations, Sea surface salinity could provide new insight into severe storms, Seeing the connection between neighboring volcanoes at depth, Warm ocean waters off Greenland put glaciers at more risk, A Year in Review: New Earth Discoveries in 2019, Developmental, Reproductive & Evolutionary Biology Program, Experiments - Cell & Molecular Biology Program, Experiments - Developmental, Reproductive & Evolutionary Biology Program, Hardware - Cell & Molecular Biology Program, Hardware - Developmental, Reproductive & Evolutionary Biology Program, Publications - Cell & Molecular Biology Program, Publications - Developmental, Reproductive & Evolutionary Biology Program, What We Study - Cell & Molecular Biology Program, What We Study - Developmental, Reproductive & Evolutionary Biology Program, NASA Science Social Media Consolidation FAQ, Search for New Worlds at Home With NASA’s Planet Patrol Project.  Chad Trujillo and his colleagues suggest that Sedna's dark red colour is caused by a surface coating of hydrocarbon sludge, or tholin, formed from simpler organic compounds after long exposure to ultraviolet radiation. By some weird coincidence, its orbit appeared to be very similar to that of another distant world known as Sedna. Follow-up observations were made in November–December 2003 with the SMARTS telescope at Cerro Tololo Inter-American Observatory in Chile, the Tenagra IV telescope in Nogales, Arizona, and the Keck Observatory on Mauna Kea in Hawaii.
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