Solar System Part 1

How many planets are in our Solar System?

• 8
• 7.5
• 9
• 76

Earth and the other planets closest to the Sun are made mostly of _______

• gas
• moons
• water
• rock and metal

Earth's ________ on its axis causes day and night.

• rotation
• revolution
• phase
• comet

One of the main differences between the outer and inner planets is __________.

• The inner planets all have water
• the inner planets are much bigger than the outer planets
• the outer planets are gas planets
• the outer planets have rings, and the inner planets don't

The __________ has planets, moons, comets, and asteroids.

• solar system
• earth
• rotation
• United States

One full orbit of an object around another object is called a ________.

• axis
• rotation
• revolution
• satellite

Why does Earth have different seasons? 

• because of the distance between Earth and the sun 
• because of the speed of Earth as it rotates on its axis 
• because of the amount of light blocked by the moon on its axis 
• because of the tilt of Earth on its axis as it moves around the sun 

Day and night is caused by the _____________ of earth on its axis.

• revolution
• orbit
• rotation

Which of the following is an accurate model of how the Sun, Earth, and Moon move?

• Sun and moon orbit Earth
• Earth and moon orbit Sun
• Earth orbits the Sun and the moon orbits Earth
• Earth and sun orbit moon

Which is the second closest planet to the sun?

• Earth
• Saturn
• Venus
• Mercury