Planetary Motion

Planetary Motion

According to Kepler, Newton, and Einstein

Multiple Choice

The earth is at the center of a ___ model.

• heliocentric

• geocentric

Multiple Choice

Retrograde describes a planet that looks like it is going ___.

• backwards

• forwards

Multiple Choice

The heliocentric model has the solar system orbiting the ___.

• sun

• earth

Multiple Choice

Planets travel in ____ orbits.

• elliptical

• circular

Multiple Choice

The closer a planet is to the sun the ____ distance is covered in the same time.

• more

• less

• same

Multiple Choice

The closer an orbiting object is to the sun, the _____ it travels.

• faster

• slower

Multiple Choice

The forces between the sun and earth are ___, therefore the earth accelerates not the sun.

• equal

• unequal

Multiple Choice

The closer a planet is to the sun the ____ it travels.

• faster

• slower

Multiple Choice

The center of mass of the Earth-moon system lies ___

• in earth

• in the moon

• between the earth and moon

Multiple Choice

Massive objects cause spacetime to ___.

• curve

• do nothing

Multiple Choice

Planets don't fall into the sun because ___.

• there is little friction

• there is no gravity