Earth in Space

A force of attraction between any two objects is called _____________.

• static electricity

• rotation

• gravity

• orbit

What two things determine the gravity of an object?

• mass & weight

• mass & distance

• density & mass

• volume & distance

Which statement best explains the role gravity played in the formation of the Sun?

• Gravity caused the Solar nebula to collapse toward the center causing the center to be dense and hot. 

• Gravity caused the protoplanetary disk to become a planetismal, which became the Sun.

The gravitational force of the sun causes the planets to orbit around it.

• False

• True

Which of the following statements best describes how the planets of the solar system formed?

• They are the remains of an exploded star once paired with the sun

• They formed from a nebular cloud of dust and gas held together by gravity.

• They are condensed rings of matter thrown off by the young sun

• The sun captured them from smaller, older stars

In our solar system, all major planets lie (roughly) in the same ____ & orbit in the same ____.

• plane, direction

• direction, plane

• space, direction

• area, space

A ____ is a cloud of gas & dust that has contracted under gravity to form a star & planets.

• hydrogen dust field

• moon

• nebula

• planet

Name the force that can pull particles of dust and gas together in space

• Moon

• Nebula

• gravity

• galaxy

These are the reason rocky planets closer to the sun while the gaseous planets are further away from the sun except..

• The region closest to the sun is too hot for gaseous materials to gather

• Dust and gas join together to form larger bodies that can eventually become planets

• The gaseous materials were pushed further away and eventually formed our outer planets.

• The heavier metal materials stayed closer to the sun and eventually formed our inner planets.

Force of attraction that exists between objects because of their masses

• mass

• gravity

• accretion

• nebula