Temperature
Mass and Lifetimes
Brightness and Luminosity
The HR diagram
Random stuff
100
The spectral type of the coolest stars on the main sequence.
What are M stars?
100

The spectral types of the most massive stars on the main sequence.

What are O stars?

100
This is how a star's brightness would change if you moved it twice as far away.
What is 4 times dimmer?
100
This is where Red Giants are found on the HR diagram.
What is the upper right?
100
A continuous spectra that passes through a thin gas will produce this kind of spectra.
What is an absorption spectra?
200
If you double the temperature of a star and keep its surface area the same, this is how much the luminosity changes.
What is 16 times more? (2x2x2x2=16)
200
The spectral types of stars with the longest lifetimes on the main sequence.
What are M stars?
200
This is what would happen to a star's brightness if you moved it 5 times further away.
What is 1/25 the brightness?
200
This is where blue giants are found on the HR diagram.
What is the upper left?
200

Stars with hotter temperatures tend to have colors closer to this primary color.

What is blue?

300
If you triple the temperature of a star and keep its surface area the same, this is how much the luminosity changes.
What is 81x more? (3x3x3x3=81)
300
O stars are different than M stars in these four ways.
What are higher mass, hotter temperature, higher luminosity and shorter lifetimes?
300
If you doubled the size of a star without changing its surface temperature, its luminosity would change by this much.
What is 4 times more?
300
This is where red dwarf stars are found on the HR diagram.
What is the lower right?
300
Stars at the upper right of the HR diagram are different from stars in the lower left by these three factors.
What are luminosity, temperature, and size?
400
Besides the changes in a stars color, we also observe changes in these.
What are spectral lines?
400
We measure the masses in stars using this kind of star system.
What are binary stars?
400
A K2V star and a K2III star differ by this quantity.
What is luminosity?
400
This is where the Sun is found on the HR diagram.
What is the middle? (Or the center of the main sequence)
400
Red light, green light, x-rays, gamma-rays, and radio waves all travel at this speed.
What is the speed of light?
500

The stars that are slightly hotter than B stars in stellar classification.

What are O stars?

500
Stars with these masses are very common and found everywhere.
What are low mass stars?
500

Stars with this kind of luminosities are very rare.

What are high luminosity stars?

500
The vertical axis on the HR diagram measures this quantity.
What is luminosity?
500
These types of solar storms can disrupt earth's magnetic field.
What are coronal mass ejections?
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