Homework Oct. 10

 The Sun’s gravity pulls the Earth toward it and keeps it from floating away into space. What keeps the Earth from being pulled into the Sun?

• sun gravity
• the moon gravity
• the earths gravity
• the earth side way motion

10)  The gravitational force between Earth and the Sun is a two-way force. Both the planet and the Sun attract each other. However, Earth revolves around the Sun rather than the Sun revolving around Earth. Which statement BEST explains the orbit of the Earth around the Sun?

• the sun is in the center of solar system
• the sun mass is much greater than earth's
• earth rotates about its axis but the sun does not
• other planets try to move the sun around them

The moon orbits our Earth. The opposite would never be true; the Earth would never orbit the moon. One reason is due to the force of gravity. The object   has a greater gravitational force and that determines what satellites orbit around it

• with greater mass
• contain mostly water
• with a thicker atmosphere
• with a greater diameter

The ancient Greek who proposed a geocentric model of the universe is

• Ptolomy
• Galileo
• Copernicus
• Kepler

When Galileo peered into the telescope and saw that Venus went through phases, what did this suggest?

• The telescope must possibly be wrong.
• Venus had a moon orbiting it.
• Venus must be orbiting the Sun.
• Venus had moons just like Earth.

The Greater the distance is between two objects of mass the _________ amount of gravitational force is between them.

• greater
• less
• equal

Why was Pluto re-classified as a dwarf planet?

• size
• discovery of over 55 other dwarfs 
• elliptical orbit
• all of the above

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

• solar system
• earth
• rotation
• United States

Which choice shows the correct order of the planets?

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

What is a common characteristic of the inner planets?

• Large
• Gaseous
• Rings
• Rocky Surface