chp.27

Kepler's Law of Ellipses states that planets orbit the sun in a path called a...

• perfect circle.

• ellipse.

• eclipse.

• rhombus.

Kepler's Law of Equal Areas states that a planet will sweep across equal areas of space in...

• alternating time periods.

• very long time periods.

• equal time periods.

• short time periods.

Kepler's Law of Equal Areas demonstrates that a planet ____ when it gets farther away from the sun.

• Speeds up

• Slows down

• Stays the same speed

• Explodes

Kepler's Law of Periods states that the square of a planet's __ is equal to the cube of the average distance between the planet and the sun.

• orbital period

• eccentricity

• mass

• diameter

Why did the outer planets hold their gases while the inner planets did not?

• Outer planets are very cold

• Outer planets are very hot

• Gravity isn't as strong

• Outer planets have no core

__ collide and combine to form protoplanets. Protoplanets combine with more rock to form __.

• Planetesimals; planets

• Planets; planetesimals

• Planetesimals; stars

• Stars; planets

What do we call the sun and all its orbiting bodies?

• The solar system

• The big bang

• The nebular hypothesis

• A supernova

Nebula

• A small body from which a planet originated in the early stages of development of the solar system; formed from collisions of gas and dust

• A rotating cloud of gas and dust that collapses due to gravity from which the Sun and planets formed; most dense at center

• A stream of high-speed, ionized particles ejected primarily from the sun's corona

• Evaporating readily at normal temperatures and pressures

Planetesimal

• A small body from which a planet originated in the early stages of development of the solar system; formed from collisions of gas and dust

• A rotating cloud of gas and dust that collapses due to gravity from which the Sun and planets formed; most dense at center

• A stream of high-speed, ionized particles ejected primarily from the sun's corona

• Evaporating readily at normal temperatures and pressures

Geocentric Model

• A rotating cloud of gas and dust

• Earth was the center of the universe and the Sun and planets orbited around it

• Earth and the planets orbited the sun

• the numeric age of an object or event