#29 Formation of the Solar System

How did the solar system begin 4.5 billion years ago?

• As a solid mass of rock

• As a cloud of dust and gas

• As a collection of ice particles

• As a single large star

What happens to a rotating object's speed as it becomes narrower?

• It decreases

• It remains the same

• It increases

• It stops

What is conserved when a rotating object spins?

• Mass

• Angular momentum

• Temperature

• Volume

What effect does gravity have on dust and gas in the solar system formation?

• It pushes them apart

• It pulls them closer together

• It makes them disappear

• It changes their color

What happens to the temperature as the pressure in the center of the dust and gas increases?

• It decreases

• It remains constant

• It increases

• It fluctuates

What formed when a Mars-sized body collided with a young Earth?

• The Sun

• The Moon

• Mars

• Jupiter

What happens to material near the plane of rotation due to linear momentum?

• It moves inwards

• It moves outwards

• It stays in place

• It evaporates

What evidence suggests that all planets formed from the same gas cloud?

• All planets orbit in the same direction as the Sun rotates.

• All planets have the same size.

• All planets have the same temperature.

• All planets have the same color.

What do images of young stars show?

• They are surrounded by water.

• They are circled by disks of dust and gas.

• They have no surrounding material.

• They are surrounded by ice.

What happened to protoplanets closer to the Sun?

• They gained more volatile molecules.

• They lost most of their volatile molecules.

• They remained unchanged.

• They became larger than outer planets.