Question

fill in the blanks:

1. the sun - centered system of planets developed by copernicus is an example of a(n)

______ model.

1. kepler discovered that the orbit of each planet is a(n) ______ rather

than a circle.

1. an object’s ______ tends to keep a moving object continuing in a

straight line and a stationary object in place.

1. an earth - centered system of planets is known as a(n) ______ mode

Explanation:

1. Copernicus's sun-centered planetary model is defined as heliocentric.
2. Kepler's first law states planetary orbits are ellipses, not circles.
3. Inertia is the property that maintains an object's state of motion.
4. An Earth-centered planetary system is called geocentric.

Answer:

1. heliocentric
2. ellipse
3. inertia
4. geocentric