## apple_pi 3 years ago How is distance to a star calculated?

1. Jemurray3

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.

2. Mikael

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

3. mayankdevnani

Nearby stars are measured with parallax

4. mayankdevnani

@apple_pi

5. mayankdevnani

what can you say about @mathslover

6. mathslover

as mentioned by mayank ... we can measure the nearby stars as : |dw:1346830698728:dw|

7. mathslover

My knowledge is not so far good but you can go through out this : http://christiananswers.net/q-eden/star-distance.html

8. mathslover

|dw:1346831064656:dw|

9. youridebruijn

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.

10. Mikael

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.

12. Mikael

Well i am sorry for the harsh tone. hope u'll understand

13. youridebruijn

Well, we're all here to learn, right ;)

14. apple_pi

Hmmm, ok but what about the ionosphere? How do we know how far the two viewpoints are from each other?