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The timeline of discovery of Solar System planets and their natural satellites charts the progress of the discovery of new bodies over history. Each object is listed in chronological order of its discovery (multiple dates occur when the moments of imaging, observation, and publication differ), identified through its various designations (including temporary and permanent schemes), and the ...
Hyperion, a large distant 10th planet theorized in 2000 to have had an effect on Kuiper Belt formation. [4] Tyche, a hypothetical planet in the Oort Cloud supposedly responsible for producing the statistical excess in long period comets in a band. [5] Results from the WISE telescope survey in 2014 have ruled it out. [6] [7] [8]
Harrington died in January 1993, without having found Planet X. [53] Six months before, E. Myles Standish had used data from Voyager 2's 1989 flyby of Neptune, which had revised the planet's total mass downward by 0.5%—an amount comparable to the mass of Mars [53] —to recalculate its gravitational effect on Uranus. [54]
By RYAN GORMAN Scientists may have found Planet X -- the long-rumored object believed to be larger than Earth and further from the sun than Pluto. Planet X and another object dubbed "Planet Y ...
Matese, Whitmire and their colleague Patrick Whitman first proposed the existence of this planet in 1999, [9] based on observations of the orbits of long-period comets. Most astronomers agree that long-period comets (those with orbits of thousands to millions of years) have a roughly isotropic distribution; that is, they arrive at random from every point in the sky. [10]
The planet is about the size of Venus, so slightly smaller than Earth, and may be temperate enough to support life, the researchers said. Dubbed Gliese 12 b, the planet takes 12.8 days to orbit a ...
The distance separating the planet and its star is just 7% of the distance between Earth and the Sun, and the planet receives 1.6 times more energy from its star than Earth does from the Sun.
The Tenth Planet, a. k. a. Days of Creation, a 1944 Captain Future novel by Joseph Samachson under the house name Brett Sterling; The Tenth Planet, a 1973 novel by Edmund Cooper; The Tenth Planet, a 1984 novel by Leo Melamed; The Tenth Planet, a 1999 novel by Dean Wesley Smith and Kristine Kathryn Rusch, the first installment in a trilogy of novels