Universe/Solar System Review

Earth's 24 hour day is caused by its _____. 

• revolution around the sun
• rotation on its axis
• moon's orbiting around it
• eclipsing the sun

What is the hottest planet in our solar system (because of its extreme greenhouse effect)?

• Earth
• Mercury
• Venus
• Neptune

How is the density of inner planets different from that of the outer planets?

• The inner planets are MORE dense than the outer planets because they're solid.
• The inner planets have the same density as the outer planets.
• The inner planets are LESS dense than the outer planets because they're solid.
• The inner planets have no density when compared to the outer planets. 

What would happen to the gravitational pull between the sun and Earth if Earth were CLOSER to the sun?

• The gravitational pull between these two objects would decrease.
• There would be no change in the gravitational pull. 
• The gravitational pull would no longer exist with any change in distance. 
• The gravitational pull between these two objects would increase.

A ______ is a space rock that burns up in Earth's mesosphere. 

• meteoroid
• meteor
• meteorite
• comet

Which planet contains the Great Red Spot?

• Neptune
• Saturn
• Earth
• Jupiter

What is an accurate description of the shape of the Milky Way galaxy?

• It is shaped like a cloud of gas and dust.
• It has an irregular shape that cannot be defined.
• It is shaped like a pinwheel.
• It is shaped like Mr. Christman.

What keeps the planets in orbit around the sun?

• Gravity and inertia combined
• Only gravity
• Only inertia
• Gravity, inertia, and acceleration

What model of the universe did Copernicus propose and Galileo support?

• heliocentric model
• geocentric model

Which statement is true about a comet?

• Its tail is always present no matter where it is in the solar system. 
• It is smaller than meteor.
• Its tail forms as it approaches the sun and always blows away from the sun.
• Its tail forms in the Oort cloud and always blows towards the sun.