Why is Pluto not a planet? BBC News

Published on Jul 16, 2015

Pluto lost its status as a planet in 2006 but its reclassification as a “dwarf” world actually puts it into an exciting new category.
Dr Marek Kukula, the Public Astronomer at the Royal Observatory Greenwich, charts the history of the diminutive object that orbits some five billion kilometres from the Sun.

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