In what year was Explorer 33 launched: 1964, 1966, 1969 or 1972?

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space

Explorer 33, also designated IMP-D and AIMP-1, was a NASA spacecraft launched on 1 July 1966 as part of the Explorer program.

Learn more on Codexery: Explorer 33 in NASA Space Probes

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?