Who discovered Neptune: Vincenzo Cerulli, Robert McMillan, Johann Gottfried Galle or Giuseppe Piazzi?

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Neptune is the eighth and most distant known planet from the Sun.

Learn more on Codexery: Neptune 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?