Why Pluto Is Not A Planet
Nasa’s New Horizons mission was launched at the start of 2006, Pluto was a planet, but it's not any more.
Pluto is only 1,430 miles (2,302km) in diameter and that makes it smaller than our Moon. Pluto is 3.7 billion miles (5.9 billion km) from the Sun – that’s 40 times the distance the Earth is from it. Consequently, it was the last 'planet' discovered. It took until 1930, because it was so small and too far away to be seen without the aid of a powerful telescope.
Because Pluto does not have enough ‘gravitational influence’ to clear its neighbouring orbit it was decided it did not make the cut.
Instead it was rebranded as a ‘dwarf planet’.
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