Stars
Most stars in our galaxy are what type of stars?
Medium stars
Astronomers use the HR diagram to classify stars based on their what?
Brightness and temperature
What color is the coolest star?
Red
In the HR Diagram, where are the main sequence stars?
In the middle
Which stars are in Quadrant I?
Blue giants - hottest and brightest
This stage of star happens when the star expands, the surface of the star is pushed further from its core, temperature drops and color changes to red.
Red Giants
The y-axis shows what?
Brightness of the star - Absolute Magnitude
What color is the hottest star?
Blue
Where on the HR Diagram would the white dwarfs be?
Towards the very bottom - more towards the left
Which stars are in Quadrant II?
What phase is happening when a Red Giant runs out of helium and the outermost layers of dust and gas drift off into space?
Planetary nebular
The higher up a star is plotted, is it brighter or dimmer?
Brighter
What size are most of the starts in the "main sequence" stage?
Mostly medium sized
Towards the very top
Which stars are in Quadrant III?
Main sequence - White dwarfs - hottest and dimmest stars
Which stage describes when the core composed of Carbon continues to glow, is very small, and is very hot?
White dwarf
The x-axis shows what?
The temperature
Where on the HR diagram would you see the red giants (not supergiants)?
To the right side of the diagram. They will be cooler.
Which stars are in Quadrant IV?
Main sequence - Coolest and dimmest
Red Supergiant _____________ Black Hole/Neutron Star
Supernova
Does it go from hottest to coolest or coolest to hottest (L to R)?
Hottest to coolest - hottest starts to the left and coolest to the right