Question

If a star has a parallax of 0.01 arcseconds what is its distance?

Answer 1

`100` parsecs or `326` light years

Explanation:

There is an inverse relation between star's parallax and its distance. A star which has a parallax `1` arcseconds is at a distance of 1 parsec, which is equal to `3.26` light years.

Hence a star which has a parallax of `0.01` arcseconds, will be at a distance of `1/0.01` or `100` parsecs or `326` light years.