Star Cycle

A star forming nebula is...

• birthplace of stars
• made up of gas and dust
• contracts due to gravity to begin forming a star
• All are correct

A protostar is the...

• end of the star's cycle
• beginning of the star's cycle

Main sequence stars are...

• the majority of stars in the universe
• the stage when the star fuses Hydrogen into Helium
• neither is correct
• both are correct

A high mass star in main sequence turns into a Super Giant and...

• loses mass but expands.
• it may fuse heavier elements such as iron.
• 10% of the star's lifetime
• all are correct

A super giant explodes in a supernova...

• 1. that lasts only a few seconds
• 2. that lasts millions of years
• 3. and hydrogen, helium and other fused elements are ejected
• 1 and 3

A supernova can cause a black hole...

• which is so dense that nothing can escape it's gravity, not even light.
• which pushes matter away from it.
• where only light escapes.
• which is actually a bright star.

A supernova can also turn into a neutron star...

• when the star's core collapses and forms a dense mass of neutrons.
• where not even light can escape.
• and then it turns into a planet.
• and it does a little dance.

A low mass main sequence star is...

• the size of our earth.
• 150 times bigger than our sun.
• like our sun.
• so dense not even light can escape it.

A low mass main sequence star expands into a red giant and...

• will grow more than 100 times it's original size.
• collapses into a black hole.

The core of a red giant collapses and the outer layers of hydrogen, helium and other elements are ejected into a cloud called...

• a black hole.
• a planetary nebula.
• a neutron star.
• a super giant.