Who discovered Pluto: Robert McMillan, Johann Gottfried Galle, Clyde W. Tombaugh or Annibale de Gasparis?

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Pluto (minor-planet number 134340) is a dwarf planet in the Kuiper belt, a ring of bodies beyond the orbit of Neptune.

Learn more on Codexery: Pluto in Planets and Dwarf Planets

How many moons does Mars have?

Which planet is known as the Red Planet?

In which constellation is Robert's Quartet located: Phoenix, Draco, Grus or Corona Borealis?

In what year was NGC 7213 discovered: 1786, 1834, 1836 or 1864?

In which constellation is R Aquarii located: Andromeda, Apus, Antlia or Aquarius?

In which constellation is NGC 5679 Group located: Corona Borealis, Phoenix, Virgo or Leo?