How do the scientist the measure the distance of an object which are light years away?

Question

I came to know about J1470B which is 430 ly away from earth. How do scientists measure the distance. It can not be by light I guess because light itself takes 430 years to come to earth. So what is it? How do they measure?

In: 12

Answer 1

You measure its place from one side of the sun, you measure it again from the other side of the sun, you calculate where those locations intersect. It is very similar to how your eyes work to estimate distances of objects.