Solar system motion

Kepler's first law states that the orbits of the planets around the sun are 

• Circles
• Ellipses
• Spheres
• irregular shapes

How does changing the mass of objects affect the force of gravity?

• Increasing mass will decrease gravity
• Decreasing mass will increase gravity
• Mass will not affect gravity
• Increasing mass increases gravity

How does changing the distance between objects affect the force of gravity?

• Decreasing distance increases gravity
• increasing distance increases gravity 
• Distance does not affect gravity

What did Kepler say in his third law about the velocity of objects in large orbits and distances compared to smaller objects and distances?

• The velocity is faster in larger orbits 
• The velocity is slower in larger orbits 
• The velocity is constant no matter what size the orbit is
• There is no relationship between velocity and size of orbit

The point in Earth's orbit when it is closest to the sun is called the

• Aphelion
• perihelion
• maximum ellipse
• minimum elipse

The point in the Earth's orbit when it is furthest from the sun is called 

• aphelion
• perihelion
• minimum ellipse
• maximum ellipse

The Earth is moving slowest 

• at its perihelion
• at its aphelion
• when perpendicular to the major axis
• during our winter

The Earth is moving fastest in its orbit when it is 

• winter
• at its perihelion
• at its aphelion
• when it is farthest away

The amount of time it takes Earth to spin on its axis is called 

• an hour
• a month
• a day
• a year

The planet with the shortest year is

• Earth
• Neptune
• Pluto
• Mercury