Galaxies, Stars, and HR Diagrams STAAR

What is a Star?

• a large celestial body that is made of plasma and held together by gravity.

• a large ball of fire held together by gravity.

Most stars of lower mass are more stable, and more common in our universe. These average stars are known as...

• Main Sequence stars

• White Dwarfs

• Red Giants

• Pulsars

What is found on the x axis of an H-R diagram?

• Luminosity
  (or brightness)

• Temperature

• Star Size

• Distance

What type of star is the Sun classified as?

• A red giant star

• A red supergiant star

• A neutron star

• A main sequence star

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

Knowing the color of a star also tells us its __________

• age

• location

• temperature

• name

Tags

NGSS.HS-ESS1-1

White dwarfs are low to medium main sequence stars which have burned through all their hydrogen and helium, passed through the giant phase. Their outer layers expand to form colorful planetary nebula, and then collapsed and cooled into small glowing coals. On the H-R diagram above, where would you most likely find white dwarfs?

• bottom left to middle

• top left to middle

• top right

• off the diagram

Based on this diagram which type of stars would belong to spectral class G and have the highest luminosity?

• Main Sequence Stars

• Giants

• Super Giants

• White Dwarfs

The category that contains the most stars is...

• Main Sequence

• Supergiants

• Giants

Felix examined several photos of stars. To compare their temperatures, he looked at the colors of the stars. He organized the photos in order from coolest to hottest. Which of these answers shows the correct order?

• red, yellow, white, blue

• white, blue, yellow, red

• yellow, white, blue, red

• blue, yellow, white, red

Which star is brighter than Alpha Centauri B, but dimmer than the sun?

• Pollux

• Spica

• Tau Ceti

• Mira