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@bbcworldservice
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In 2005 a new dwarf planet was discovered at the edge of our solar system by Professor Mike Brown.
The existence of Eris put Pluto's 75-year planet status under question.
Watch more from Witness History: https://t.co/jj9jY14d8H https://t.co/d7L8k3K4gg
The existence of Eris put Pluto's 75-year planet status under question.
Watch more from Witness History: https://t.co/jj9jY14d8H https://t.co/d7L8k3K4gg