In which constellation is Abell 2390 located: Pegasus, Pisces, Cetus or Corona Borealis?

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Abell 2390 is a large cluster of galaxies in the constellation Pegasus.

Learn more on Codexery: Abell 2390 in Galaxy Clusters and Groups

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?