Planet Nine


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January 8, 2019 to April 26 2020
Closed on 24 and 25 December
Open on Mondays 23 and 30 December
All Day Event
English : 27 minutes
French : 27 minutes
4801, avenue Pierre-De Coubertin
Montréal, QC Canada
H1V 3V4

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Since Pluto was downgraded to a dwarf planet, this object on the outskirts of our Solar System has continued to fascinate astronomers. The New Horizons probe flyby in 2015 revealed a world far more complex than anyone had expected and offered a new perspective on other objects near Pluto, in the Kuiper belt.

The study of these objects with such magical names - Eris, Sedna, Haumea and many more – suggests that there may be a new planet hidden beyond the Kuiper belt. Follow Mike Brown and his team of three fellow Californian astronomers as they search for this ninth planet!

  • Produced by: Adler Planetarium, Chicago (United States)
  • Fact sheet

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