Classifying Stars

What color are the hottest star?

• Red

• Orange

• Yellow

• Blue

What color are the coolest stars?

• Red

• Yellow

• Orange

• Blue

Where on the HR star diagram are the main sequence stars?

• Top right

• Middle

• Bottom left

What kinds of stars on the HR diagram are dying?

• Giants

• Main sequence stars

• Dwarfs

• Both giants and dwarfs

Tags

NGSS.HS-ESS1-3

What does the luminosity of a star indicate about its brightness?

• If it's a negative number, it's a bright star

• If it's a positive number, it's a dim star

• Its how many times brighter the star is compared to our sun

What does the absolute magnitude indicate about a star?

• Its color

• Its the actual brightness of a star, and negative numbers mean it is brighter

• It tells how many times brighter it is compared to our sun

What are main sequence stars running out of when they start to die?

• Hydrogen atoms (or protons) to fuse together

• Hydrogen atoms (or electrons) to fuse together

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

What stage of life is OUR SUN in on the HR Diagram?

• Dwarf

• Giant

• Main Sequence

Tags

NGSS.HS-ESS1-1

What spectral class is OUR SUN classified on the HR Diagram?

• O

• A

• G

• M

Approximately what is our sun's absolute magnitude?

• 0

• 1

• 4.5

• -4.5