Planet

Which of the following terms match the definition below?
"To spin around on an axis"

• revolve
• orbit
• rotate
• axis

How long does it take for Earth to rotate or spin on its axis?

• 24 hours
• 1 year
• 365 days
• 12 months

Which of the following causes seasons?

• Earth's tilt and rotation
• Earth's tilt and revolution
• Earth's revolution and rotation
• Earth's orbit 

About how long does it take for the moon to revolve around Earth one time?

• 30 days
• 1 year
• 1 day
• 24 hours

If scientists discovered a large, round object revolving around a star, that object would be considered a...

• moon
• planet
• star
• solar system

Which is true of stars and planets?

• Stars move through the sky, but planets do not. 
• Stars are the brightest objects in the night sky.
• It is easier to see planets than stars because planets glow with heat.
• Stars and planets both move. 

A star's color tells us about its...

• temperature
• size
• rotation
• distance from Earth

"A group of objects in space that orbit a star in the center, plus the star itself" best defines which of the following terms?

• solar system
• galaxy
• universe
• asteroid belt

How do asteroids and comets differ?

• Comets are made of rock, while asteroids are not.
• Asteroids are mostly made of frozen gases, while comets are not. 
• Asteroids are made of metal, while comets are not. 
• Asteroids are made of ice, while comets are not. 

Name the outer planets in the correct order. 

• Jupiter, Saturn, Uranus, Neptune
• Mercury, Venus, Earth, Mars
• Saturn, Jupiter, Uranus, Neptune
• Mercury, Earth, Mars, Venus