Questions in this quiz: Dwarf Planets — Pluto and Beyond

The 2006 IAU reclassification. Pluto and Charon, the New Horizons flyby, plus Eris, Haumea, Makemake, Sedna, and the trans-Neptunian region. Why Pluto isn't a planet anymore.

1. In which year did the International Astronomical Union formally adopt the definition that demoted Pluto to a 'dwarf planet'? — Options: 2003, 2006, 2008, 2012
2. Which spacecraft performed the first close flyby of Pluto, returning detailed images of its surface in 2015? — Options: Voyager 2, Cassini, New Horizons, Juno
3. According to the IAU's 2006 definition, what is the third criterion a body must meet to be classified as a 'planet' — the one Pluto fails? — Options: It must have at least one natural satellite, It must have cleared the neighborhood around its orbit, It must possess a magnetic field, It must have an atmosphere
4. Which trans-Neptunian object's discovery in 2005 was a major catalyst for the IAU debate, after it was initially reported as being larger than Pluto? — Options: Sedna, Quaoar, Eris, Orcus
5. What is the name of Pluto's largest moon, discovered in 1978? — Options: Nix, Hydra, Charon, Styx
6. What name is given to the disc-shaped region beyond Neptune populated by Pluto, Haumea, Makemake and many other icy bodies? — Options: The Oort Cloud, The Asteroid Belt, The Kuiper Belt, The Heliosphere
7. Which dwarf planet did NASA's New Horizons spacecraft fly past in July 2015?