I am the galaxy closest in light years to the Milky Way Galaxy?

How long does it take Mercury to rotate on its axis?

The word "lunar" means something related to what?

What is the name of the spacecraft that took the first men to the moon?

What is the only moon in the solar system that has an atmosphere?

What is a meteoroid called if it lands on the Earth's surface?

What is the study of stars, planets and galaxies called?

What was the first probe to land on Venus?

Who first proposed the heliocentric model of the solar system?

Which Apollo mission was launched on January 31, 1971?

Who is credited with creating the "Big Bang Theory"?

What star is labeled Alpha Ursa Minoris?

What star, next to the Sun, is nearest to Earth?

How long does it take for the moon to revolve around the earth?

What was the first planet discovered with the aid of a telescope?

What does the first "A" in NASA stand for?

What is the name for a body in orbit around the Sun?

Which Apollo mission was launched on April 11, 1970?

What is the constellation in the shape of a winged horse called?

What does the astronomical object called Charon orbit?

How many planets are there in the Solar System (including Pluto)?

Where is the Sun plotted on the Hertzprung-Russell diagram?

What is the name for the boundary around a black hole, beyond which events cannot affect the observer?

What agency maintains the U.S. space program?

How many days was Skylab III in space?