Mass is...

• the amount of space an object takes up
• how compact an object is
• the amount of matter an object is made up of
• weight

On the moon, if I drop a feather and a bowling ball at the same time..

• The bowling ball will hit the moons surface first
• The feather will hit the surface of the moon first
• They will fall at the same rate and both hit the surface of the moon at the same time
• They will float away because there is no gravity on the moon

If I drop a bowling ball and feather on earth, 

• the bowling ball will hit the ground first
• the feather will hit the ground first
• they will hit they ground at the same time
• they will float away

The solar system STARTED as...

• stars and dust
• dust and gas
• gas and stars
• stars and planets

What would cause a feather to slow down when dropped on earth?

• air resistance
• air pressure
• air flow
• the feather is so light!

Two forces needed to form and maintain our solar system are...

• air resistance and pressure 
• pressure and gravity
• gravity and air resistance
• hydrogen and oxygen

Particles inside stars are bumping into each other, this causes an increase in temperature and...

• gravity
• pressure
• stars
• light

Gases in a solar nebula are mainly..

• hydrogen and helium 
• carbon and iron
• oxygen and helium
• helium and oxygen

The solar system started as a nebula.. a nebula is...

• a cloud of dust and gas
• a cloud of water and gas
• a cloud of dust and water
• a cloud of stars

Our star, the sun, is a medium sized star. What type of star is our sun?

• red dwarf
• white dwarf
• main sequence 
• black hole