Stellar Lifecycle

What is a galaxy?

• Like a solar system, but made of dust

• A cluster of thousands of stars all floating together in space

• A cellphone made by the Nokia company

• A grouping of hundreds of millions of stars held together by gravity

Tags

NGSS.MS-ESS1-2

A star starts its "life" in a vast cloud of gas called a nebula.
How big is a typical nebula?

• Smaller than planets
• Bigger than planets, smaller than stars
• Bigger than stars, smaller than galaxies
• Bigger than galaxies

The most important thing to know about a star is its...

• Volume
• Mass
• Temperature
• Age

Which of the following stars would you expect to have the highest average temperature?

• High mass, high volume star
• Low mass, high volume star
• High mass, low volume star
• Low mass, low volume star

Tags

NGSS.HS-ESS1-1

Which of the following stars would you expect to have the highest density?

• High mass, high volume star
• Low mass, high volume star
• High mass, low volume star
• Low mass, low volume star

What is the approximate temperature at which Hydrogen fusion can start inside of a Main Sequence Star?

• 1,500º C

  One thousand, five hundred degrees C

• 150,000º C

  One hundred fifty thousand degrees C

• 15,000,000º C

  Fifteen million

  degrees C

• 1,500,000,000º C

  One billion, five hundred million degrees C

Tags

NGSS.HS-ESS1-1

What element is used as fuel for a Main Sequence Star?

• Helium
• Hydrogen
• Iron
• Carbon

Tags

NGSS.HS-ESS1-1

In a very very very very long time, our Sun will run out of fuel and transition into a Red Giant. How will its mass change?

(Before ejecting a planetary nebula)

• The giant star will have more mass than our sun

• The giant star will have less mass than our sun

• The giant star will have the same mass as our sun

• This is the wrong answer.

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

What are the two forces that control the size of a star?

• Gravity pushes inwards, external pressure pushes outwards

• Internal pressure pushes outwards, external pressure pushes inwards

• Gravity pushes outwards, internal pressure pushes inwards

• Internal pressure pushes outwards, gravity pulls inwards

Tags

NGSS.HS-PS2-4

What is the biggest difference between a protostar and a main sequence star?

• Protostars are more massive than main sequence stars
• Protostars do not engage in nuclear fusion
• Stars spend far longer in the protostar phase than their main sequence
• Protostars are hotter than main sequence stars