2007-02-24 14:18:17 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Astronomy & Space
From its spectrum astronomers can tell how hot a star is and how much light it should put out. They use this to determine how bright the star would look at a specific distance (a parsec) which determines its absolute magnitude in relation to other star's luminosity at that distance.
2007-02-24 14:34:59 · answer #1 · answered by Twizard113 5 · 0⤊ 0⤋
The further away something is, the less bright it will be. Using the distance modulus equation, you can find the distance to an object by measuring its brightness in apparent magnatude and comparing it to what its absoulte magnitude is supposed to be.
2007-02-24 22:54:15 · answer #2 · answered by Roman Soldier 5 · 0⤊ 0⤋
iif you know the distance and you can extrpolate how bright it should be. Then you can determine size of the star.
If you already sort of know the size then you can use the brigness to determine the distance.
2007-02-28 05:10:20 · answer #3 · answered by My name is not bruce 7 · 0⤊ 0⤋
Red shift. Farther the light source, higher the red shift.
2007-02-25 09:45:21 · answer #4 · answered by Anonymous · 0⤊ 0⤋