In which constellation is Nu Horologii located: Grus, Equuleus, Horologium or Fornax?

How many moons does Mars have?

Which planet is known as the Red Planet?

In what year was USA-151 launched: 1994, 1999, 2000 or 2003?

In which constellation is HD 131496 located: Eridanus, Carinae, Boötes or Ursa Minor?

In what year was 13P/Olbers discovered: 1811, 1812, 1815 or 1823?

In what year was Array of Low Energy X-ray Imaging Sensors launched: 1974, 1983, 1993 or 1999?