Who described the rings of Saturn as "ears of a teacup"?

What is the second planet in distance from the sun?

Which Apollo mission was launched on January 31, 1971?

What astrological sign starts on January 21st?

The Astronomical Unit (AU) is a unit of measurement based on the average distance between what two bodies?

How many stars make up Orion's Belt?

Where on the moon did people first land a spacecraft?

What was the element mercury named after?

What was the name of the first manned space vehicle?

Which constellation are the stars Castor and Pollux in?

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

About how many days does it take for the moon to pass through all phases?

How many astronauts manned each Apollo mission?

What are the "Big Dipper" and "Orion" examples of in the night sky?

How many days in a Mercurian year?

Who was the first person in space?

Which of Jupiter's moons is covered by active volcanoes?

Which former planet is the tenth-largest body directly orbiting the sun?

What is the opposite to ordinary matter called?

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

Between which two planets does the asteroid belt lie?

What is a sudden violent explosion on the sun called?

The Horsehead Nebula can be found in what constellation?

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

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