Astronomy 1-1 Kepler's Laws

Planets orbit the Sun in a shape called a(n)

• circle
• ellipse
• focus
• perihelion

What has an eccentricity of zero

• a straight line
• a large ellipse
• a circle
• a small ellipse

What has an eccentricity of one

• a straight line
• a large ellipse
• a circle
• a small ellipse

The measure of how stretched out an ellipse is (its flatness), is referred to as

• Orbital period
• Ellipticalness
• Massiveness
• Eccentricity

Which planet has the most eccentric orbit?

• mercury
• earth 
• neptune
• mars

Which planet is used as a point of reference for all measurements?

• Mercury
• Earth 
• Pluto 
• Mars

Kepler's 2nd Law deals with 

• the shape of the planets' orbits
• the speed/area the planet travels 
• the length of time it takes the planet to orbit the sun
• Gravity

Line drawn from the sun to planet sweeps out equal areas in equal time is Kepler's _____ Law.

• 1st
• 2nd
• 3rd
• 4th

Where is the planet moving faster

• Position A to B
• Position B to C
• Position H to I
• They all are moving the same speed

A planet moves __________ when it is farther from the sun.

• faster
• slower
• the same speed