Front

The theory that explains the formation of the solar system is called ____.

Back

Nebular Theory

Front

What are asteroids?

Back

Large metallic rocks that orbit the sun.

Front

During accretion, the planetesimals kept:

Back

Colliding and sticking together.

Front

How long ago did the solar system begin to form?

Back

5 billion years ago.

Front

Planets outside of our solar system are called ____.

Back

Exoplanets.

Front

What is the primary component of a nebula?

Back

Gas and dust.

Front

What process leads to the formation of planets from planetesimals?

Back

Accretion.

Front

What is the difference between a comet and an asteroid?

Back

Comets are icy bodies that release gas or dust; asteroids are rocky bodies.

Front

What is a protoplanet?

Back

A large body of matter in orbit around the sun that may become a planet.

Front

What role do gravity and pressure play in star formation?

Back

They cause gas and dust to collapse and form stars.