When Is A Planet Not A Planet The Story Of Pluto
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Why is Pluto no longer a planet? - BBC News Nasa's New Horizons mission made a close pass of Pluto this week. For more than 70 years, Pluto was one of nine planets recognised in our Solar System. But in 2006, it was relegated to the status ... Mercury (planet) - Wikipedia Mercury is the smallest and innermost planet in the Solar System.Its orbital period around the Sun of 87.97 days is the shortest of all the planets in the Solar System. It is named after the Roman deity Mercury, the messenger of the gods.. Like Venus, Mercury orbits the Sun within Earth's orbit as an inferior planet, and never exceeds 28 away from the Sun when viewed from Earth. Planets beyond Neptune - Wikipedia Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in the mid-19th century and continued at the start of the 20th with Percival Lowell's quest for Planet X.Lowell proposed the Planet X hypothesis to explain apparent discrepancies in the orbits of the giant planets, particularly Uranus and ...
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