Unit 1 Review

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

• circle
• ellipse
• focus
• perihelion

An ellipse is drawn around two points called

• aphelion
• perihelion
• foci
• axis

Where is the planet moving faster

• Position A to B
• Position B to C
• Position H to I
• Position I to J

What has an eccentricity of zero

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

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

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

• faster
• slower

The farther away a planet is from the sun, the _______ it takes it to orbit the sun once. 

• longer
• shorter

The path a planet travels around the sun is called its 

• orbit
• ellipse
• barycenter
• precession

What does Kepler's 1st Law state? 

• all planets move in elliptical shaped orbits around the sun
• all ellipses have foci
• not all ellipses have the same eccentricity
• the sun is located at one of the foci

What does Kepler's 2nd Law state? 

• during a planet's orbit, the planet will sweep out equal areas in its orbit in equal amounts of time
• all areas are equal in space
• triangles have equal areas
• no two points in a planet's orbit are equal