Stellar Evolution and the Big Bang

Stars are made mostly of 

• Hydrogen and oxygen
• sodium and helium
• oxygen and nitrogen
• hydrogen and helium

When does a protostar become a star?

• The core of the protostar stops gaining mass
• All of the gas and dust in nebula collect
• Hydrogen begins fusing into helium
• The core of the protostar collapses

How does the sun produce energy?

• Nuclear Fission
• Burning gas
• Nuclear Fusion
• Absorbing heat from space

Which of the following is not a stage for medium mass stars?

• Red Giant
• Planetary nebula
• White dwarf
• Black hole

Which of the following is not a stage for high mass stars?

• Main sequence
• Red dwarf
• Red supergiant
• Supernova

Which stage is most likely for a star with extremely low mass?

• Planetary nebula

• Red dwarf

• Red giant

• Supernova

About 90 percent of stars are ____ stars.

• red giant

• main sequence

• luminosity

• supergiants

Which of these stars is hottest?

• Red Star
• Yellow Star
• Orange Star
• Blue Star

Compared to the rest of the stars, our sun is considered...

• Extremely Large and Cold
• Small with a medium temperature
• Medium size with medium temperature

Nebulae are considered "Stellar Nurseries" because...

• Planets are created from the gases
• Stars form from them
• Asteroids are formed from them