Life Cycle of a Star

Imagine you are an astronomer studying a star. You notice that the star is in a stable period of its life cycle. This phase is called... 

• The birth of a star

• Nebula 

• Neutron star

• Main Sequence 

Gravity pulls gases and dust particles in space toward one another, squeezing them into a smaller and smaller space. The temperature at the center rises high enough for nuclear fusion of hydrogen to begin.
What stage in a stars life cycle is this describing? 

• The birth of a star
• The death of a star
• Black Hole
• Stellar Nebula

Cooler stars appear to be what color? 

• Red
• Blue
• Yellow
• Green

What factor influences the brightness of a star? 

• It's size

• It's distance from Earth

• It's age

• All of the above 

A star at the stage in its life cycle when it stops burning hydrogen, begins burning helium, and expands to a large, low-density star.
What stage in the life cycle does this describe? 

• Supernova
• Black Hole
• Main Sequence
• Red Giant or Red Supergiant

What fuel do stars use? 

• Oxygen
• Hydrogen
• Carbon
• Iron

In a large mass star, the temperature reaches more than 100 billion degrees. The repulsive forces between the iron nuclei explode the star’s mass into space in a ....

• Nebula
• Black Hole
• Supernova
• Neutron star

Larger stars (stars with more mass) have a longer life cycle. 

• True
• False

A relatively small, dense star at the end of its life cycle, which generates little or no energy and has contracted to its densest state.
What stage in the life cycle does this describe? 

• Black Hole
• Nebula
• White Dwarf
• Red Giant

what stage of the life cycle of a star is this? 

• Planetary Nebula
• Black Hole
• Neutron Star
• Giant/Supergiant