Planetary Systems Review

_______ is the force that keeps Earth in orbit around the Sun.

• Motion
• Gravity
• Kinetic
• Electrons

It takes the Moon _________ to complete one orbit around the Earth.

• 28 days
• 2 weeks
• 21 days
• 2 months

The Sun is a star, but appears brighter than other stars because...

• It burns hotter than any other star
• It burns more hydrogen
• It is the closest star to Earth
• The Sun's orbit brings it so close to Earth

Earth orbit around the Sun looks similar to what shape?

• Circle
• Square
• Octagon
• Ellipse

It takes to Moon ___________ to cycle from Full Moon to Full Moon.

• 2 weeks
• 14 days
• 3 weeks
• About 1 month

The diameter of the Sun is _________ times Earth's diameter.

• 13
• 1,000
• 30
• 100

Earth's rotation describes how it __________________.

• orbits around the Moon
• changes seasons
• orbits around the Sun
• turns on its axis

Earth's revolution describes how it __________

• orbits around the Moon
• changes season
• orbits the Sun
• turns on its axis

If the Earth is represented by a ball with a diameter of 8cm. What will the diameter of the Moon be in the same model?

• 2 cm
• 4 cm
• 1 cm
• 1/2 cm

If the Earth is represented by a ball with a diameter of 8cm. How far away will the Moon be positioned from the Earth?

• 24 cm
• 30 cm
• 240 cm
• 300 cm