Definition of planet
Two planets sharing same orbit around their star
Astronomers reported on July 19 the discovery of what could be two planets sharing the same orbit around their star.
They said it's the strongest evidence yet of this bizarre cosmic pairing, long suspected but never proven.
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Planet 9 may be "twisting" the solar system - Caltech research
BELGRADE - A planet, believed to be the ninth in our solar system, but which has remained mysteriously elusive to astronomers could be causing the "wobble" in our solar system that causes planets to move at a different angle to the sun, according to new research.