Stars & the HR Diagram

What are the two observable properties of stars from Earth?  *Choose two.

• Brightness

• Size

• Temperature

• Color

What did Astronomers measure once they took the distance of the star into account?

• Apparent magnitude

• Temperature

• True brightness (absolute magnitude)

• Color

What gasses fuse in the beginning of a star's life?

• Hydrogen to Helium

• Helium to Carbon

• Hydrogen to Carbon

• Nitrogen to Oxygen

Where do stars spend most of their life on the H-R Diagram?

• Supergiant

• Giant

• Main Sequence

• White Dwarf

What will happen to the Sun after it uses up all its' hydrogen?

• it will just go out, like a match/candle

• it will collapse inward into a tiny star

• it will expand into a red giant

Once the Sun runs out of fuel during the Giant stage, what stage will it go to next?

• Super Giant

• Giant

• Main Sequence

• White Dwarf

Where do the red SUPERGIANT stars come from?

• Stars that were smaller than our Sun

• Stars that are the same size as our Sun

• Stars that are much larger than our Sun

What do hotter Supergiant stars end up as after the go through a SUPERNOVA phase?  *Explosion!  (Choose two)

• White Dwarfs

• Black Holes

• Neutron Star

• main sequence stars  *Like our Sun

What two properties are graphed on an H-R diagram?

Summarize your learning from this video.