Formation of the Solar System and Gravity

--------------------------- formed when dust grains stuck together, and then eventually increased in size until they were kilometers sized objects.

• planetesimals

• stars

• planets

• asteroids

How did the sun form?

• It formed when the solar nebula collapsed

• It formed when gas and ice collided and exploded

• It formed when fusion began in the center of the protostellar disk

• There is no such thing as a sun.

The density of gas in a collapsing interstellar cloud is low at first, but ____________________draws matter together until it is concentrated enough to form a star and possibly planets.

• space

• mass

• gravity

• dust

Where in the protoplanetary disk did the rocky planets form?

• In the cold temperatures of the outer disk

• In the hot temperatures of the inner disk

• The formed in the outer disk but then moved in.

• They formed in the inner disk and then moved out

Which model has greater gravitational attraction (if any)

• Model A
• Model B
• Both Model A and Model B (same gravity)

What happened first in the formation of the planets?

• The Sun Forms

• The Planetesimals form

• The Planets form

• The Solar Nebula Collapses

As distance between two objects increase the pull of gravity 

• Increases
• Decreases
• Stays the same

Astronomers think that the solar system formed from an interstellar

• rocks

• clouds

• explosions

• debris

What is gravity?

• A force
• Energy
• A push
• All of them

Which objects have a STRONG force of gravity?

• Objects with GREATER mass, like elephants
• Objects with LESS mass, like mice