Checkpoint review

Why does the sun appear brighter in our sky than any other star

• Its hotter

• ITs much closer

• Its a different color

• Its moving faster

The energy from the sun is created by a process called:

• nuclear fission
• nuclear fusion
• nuclear reaction
• nuclear core

Energy is created in the core when two _____________ atoms join together to form a ______________ atom.

• helium, hydrogen
• carbon, hydrogen
• nitrogen, helium
• hydrogen, helium

The tail of a comet points towards the sun

• True
• False

What is the sun mostly made up of

• Helium
• Core
• Carbon
• Hydrogen

What force keeps objects in our solar system orbiting our Sun?

• push
• gravity
• motion
• pull 

What is the main force causing all mass in the universe to move?

• Heat

• Light

• Density

• Gravity

What would happen to the planets in the solar system if the sun’s gravitational force were to suddenly disappear?

• They will stop moving and become static.
• They will stop spinning.
• They will fly away in straight lines.
• They will start moving toward the Sun

What is the difference between weight and mass?

• Weight is the amount of matter in an object, and mass is the gravitational force exerted on an object
• Mass is the amount of matter in an object, and weight is the gravitational force exerted on an object
• Weight is the amount of matter in an object, and mass is the size of an object.
• Weight is the size of an object, and mass is the amount of matter in an object

As the distance between two objects in space increases the gravity will _______________

• increase
• decrease
• stay the same