A __________ is a chunk of ice & dust that has a bright head & a long narrow tail.

• asteroid
• planet
• meteoroid
• comet

The ______is between the orbits of Mars & Jupiter.

• solar system
• asteroid belt
• terrestrial planets
• photosphere

The four terrestrial planets are known for their _________

• hot temps
• deep atmospheres
• rocky surfaces
• large size

A sun centered system of planets was developed by __________

• Galileo
• Ptolemy
• Copernicus
• Issac Newton

What is a planet?

• a swirling ball of gases
• a star
• a huge ball made out of rock
• a large object that orbits a star

Which planet is between Venus and Mars?

• Earth
• Neptune
• Mercury
• Jupiter

Select the order from smallest to largest.

• Sun, Milky Way, solar system, universe
• Sun, Milky Way, universe, solar system
• Sun, solar system, Milky Way, universe
• Sun, solar system, universe, Milky Way

A spiral galaxy of stars that contains our Sun

• Planisphere
• Intensity
• Star
• Milky Way

The theory that astronomers have developed to describe the formation of the Universe is called the 

• the Big Bang Theory 
• the Big Crunch Theory
• Collision Ring Theory
• Galactic Expansion Theory

What is the smallest terrestrial planet?

• Mars
• Venus
• Mercury 
• Earth