What is the force that pulls planets towards the sun?

• inertia

• gravity

• acceleration

• momentum

What creates a planet's year?

• one rotation on its axis
• one eclipse of the sun
• one revolution around the sun
• one collision with an asteroid

Which part of the comet is being shown by the RED arrow?

• dust tail
• ion tail
• coma
• nucleus

Which direction does a comet's tail face as it approaches the sun?

• away from the sun
• parallel to the sun
• perpendicular to the sun
• towards the sun

Which planet is known as the "red planet" because of its rust-colored surface?

• Mercury
• Jupiter
• Neptune
• Mars

Which planets is known as Earth's "twin" because of its similar size?

• Mercury
• Venus
• Mars
• Pluto

Between which two planets' orbits is the asteroid belt located?

• Earth and Mars
• Jupiter and Saturn
• Saturn and Uranus
• Mars and Jupiter

Which planet has a thick yellowish cloud cover of carbon dioxide, which creates the greenhouse effect and the highest surface temperatures?

• Mercury
• Venus
• Earth
• Mars

At what point in the Milky Way galaxy is our solar system located?

• 1
• 2
• 3
• 4

Which planet do scientists believe had rivers of flowing water at one point in time as evidenced of dry river channels on its surface? (It also has polar ice caps.)

• Neptune

• Jupiter

• Venus

• Mars