______ is a force that causes dust particles to stick together in a nebula.

• nuclear fusion
• gravity
• hydrogen
• iron

A star is born and lit up  when ______ happens and provides the star with energy that it will use for millions of years.

• nuclear fusion
• gravity
• hydrogen
• iron

What color star lives the longest?

• blue
• red
• yellow
• white

After a supernova of what used to be a blue star with a very large mass, what is left?

• white dwarf star
• black dwarf star
• black hole
• white hole

Why are black holes black?

• No light can escape the black hole's gravity 
• No light is reflected from the closest stars
• They are transparent, so you see space
• Plants around it prevent light from hitting the black hole.

All stars begin as a __________?

• giant
• black hole
• white dwarf
• nebula

Our Sun is average-sized, average temperature, and middle aged.

• False
• True

Which stage do stars spend most of their lifetime?

• first stage 
• third stage
• main sequence
• final stage

True or False:  Massive stars have LONG lives.

• False
• True

Which star has the lowest luminosity?

• A
• B
• C
• D