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List the 5 Characteristics used to classify stars.
color, temperature, size, composition, and brightness.
What determines how bright stars are viewed from Earth?
The distance from Earth and how bright it truly is.
Define absolute brightness.
The brightness the star would have if you were at a standard distance from Earth.
What two variables must astronomers have to calculate absolute brightness?
Distance and apparent brightness.
Is a light year a measurement of distance or time?
It's a measure of distance because it used to show how long light travels in a year.
The apparent change in position of an object when you look at it in different places.
how much the nearby star appears to move against a background of stars much farther away.
What is plotted on the Hertz sprung diagram?
The surface temperature of the stars are plotted on the x axis and the absolute brightness on the y axis. Most stars are are main sequence stars.
As main sequence stars surface temperature increases, what happens to the absolute brightness?
Absolute brightness increases.
What kind of star is our sun? What color is it?
Main sequence star. Cooler and not as bright. It is yellow.
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