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Big stars are brighter than small stars, and hot stars are brighter than cool ones.

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Q: How can stars have different absolute brightness?
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What do you call the real brightness of the stars?

The term is "absolute magnitude".


What is a stars brightness as if it were a standard distance?

Theres `Absolute Magnitude` which is the brightness of a star at a set distance. Then there is `Apparent Magnitude` which is the apparent brightness from earth, regardless of distance.


How does the hertzsprung Russell diagram classify stars?

increase in absolute brightness as they increase in temperature.Increase in brightness as they increase in temperature


What are two ways to describe a stars brightness?

Apparent magnitude and absolute magnitude.


Which of these measurements allows scientists to compare the brightness of stars?

Absolute Magnitude


What does the Hertzsprung-Russell diagram show about main-sequence stars?

increase in absolute brightness as they increase in temperature.Increase in brightness as they increase in temperature


What are the three main elements that determine a stars brightness from earth?

1) absolute brightness 2) distance 3) intervening dust


What does measurement of the brightness of a star call?

Brightness of stars (apparent and absolute magnitude) is measured by convention, taking an another star as a standard.


What is similarities between apparent brightness and absolute brightness?

Both relate to brightness; both are measured in the same units; both are used for astronomical objects such as stars or galaxies.


What is different shape between apparent and absolute magnitude of stars?

This has nothing to do with shape. The apparent magnitude means how bright a star looks to us. The absolute magnitude means how bright the star really is (expressed as: how bright would it look at a standard distance).


What is the stars actaul brightness?

That is called "absolute brightness" or "absolute magnitude". It is defined as how bright a star would look at a standard distance (10 parsec, to be precise). The brightness of stars can vary a lot; some stars (supergiants) are millions of times as bright as our Sun, others (red dwarves) are thousands of times less bright. (Our Sun is in the top 10 percentile, though.)


What is absolute value of a star?

"Absolute value" is used for numbers, not for stars. For stars, there is something called "absolute brightness" or "absolute magnitude"; that refers to how bright the star really is (as opposed to what it looks like for us). It is defined as how bright the star would look at a standard distance.