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A couple of different ways, depending on the level of accuracy you're looking for. Observing the redshift of its galaxy and then using Hubble's law, or using optical parallax, or determining its size by other means and then calculating its distance by measuring its brightness are all possibilities.
Mostly by the amount of doppler redshift. Sometimes the starlight undergoes some absorption on its path (dust, u know is everywhere) , if we know the amount of absorption per distance - it is an additional clue
Nearby stars are measured with parallax
what can you say about @mathslover
as mentioned by mayank ... we can measure the nearby stars as : |dw:1346830698728:dw|
My knowledge is not so far good but you can go through out this : http://christiananswers.net/q-eden/star-distance.html
There are more options but the one that I know is already used in an answer above by mathslover. It's been measured with parallax, two measurement of the exact position of the star in the sky, 6 months apart (one side and from the other side of the earth). With more distant stars you should measure the brightness, I think.
Sorry mr. @muhammad9t5 , YOU ARE MISTAKEN YOURSELF and MISLEAD OTHERS. NEVER HAS ANY COSMIC OBJECT HAS BEEN MEASURED BY ITS GRAVITY. 1 IT IS USUALLY IMPOSSIBLE TO SEPARATE ITS GRAVITY FROM OTHER FORCES (GRAVITATIONAL or other 2 FOR STARS - IT WILL NEVER BE POSSIBLE BECAUSE IT IS TOO WEAK. I suggest you think in terms of reality, real physics and not overfertile imagination....
@Mikael sorry sir.
Well i am sorry for the harsh tone. hope u'll understand
Well, we're all here to learn, right ;)
Hmmm, ok but what about the ionosphere? How do we know how far the two viewpoints are from each other?