What is the theory that astronomers have developed to describe the formation of the universe?

• Apparent Magnitude

• Light year

• Big Bang Theory

• Galaxy

What is the brightness of a star as it appears to an observer on Earth?

• Absolute Brightness

• Apparent Brightness

• Light year

• Spiral Galaxy

What is an object formed when a massive star collapses? It is so dense that even light can not escape its gravity.

• Main-sequence

• black hole

• Apparent Magnitude

• Comet

The Milky Way Galaxy (where we live) is most likely

• an irregular galaxy

• a spiral galaxy

• an elliptical galaxy

• a nebula

Which of the following is not a type of galaxy?

• Irregular
• Triangular
• Spiral
• Elliptical 

An imaginary pattern of stars in the night sky is called a...

• Constellation

• Solar System

• Galaxy

• Local Group

What is a star's life cycle determined by?

• the mass

• the name

• the shape

• the color

What does a light year measure?

• Temperature

• Distance

• Brightness

Our solar system is

• 15 million years old

• 10 million years old

• 5 billion years old

A star is born when

• a nebula expands

• a protostar begins to cool

• Helium and oxygen combine

• Nuclear fusion stars