Objects like Sedna and 2012 VP113 have highly elliptical orbits that extend far into the inner Oort Cloud. The Dark Energy Survey, originally designed to study galaxy clusters, has also proven adept at spotting distant solar system objects.
Ninth Planet Versus Tenth Debate: Defining Planet X and the Solar System's Hidden Giants
Lowell predicted the existence of a ninth planet to explain perceived anomalies in the orbits of Uranus and Neptune. This quest involves not just adding another member to the roster, but understanding the dynamics of the outer solar system and the potential existence of massive, undiscovered bodies influencing the orbits of distant objects.
Their trajectories are clustered in a way that is difficult to explain without the gravitational influence of a massive, unseen body. In 2006, the International Astronomical Union (IAU) established a formal definition of a planet, requiring it to orbit the Sun, be spherical in shape, and have "cleared its neighborhood" around its orbit.
Ninth Planet Versus Tenth Debate: Unpacking the IAU Definition and the Hunt for Planet X
Historical Searches and the Planet X Hypothesis The search for a distant planet, often referred to as Planet X, began in the early 20th century with Percival Lowell's observations. The hypothetical concept of a 10th planet in our solar system has captivated the imagination of astronomers and the public alike for decades.
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