Asked by dbh

Which of the following is typically NOT a method scientists use to determine astronomic distances?

a. brightness as compared to other objects
b. color of the object
c. radio wave signature
d. the size an object in space appears

I think it's c but I could be wrong
Answered by dbh
I mean d
Answered by Arya
I think its b. How can color have anything to do with astronomical distances???
Answered by dbh
I was right, it is d.
(by color, I think they mean the color of the light, so yes that's a way)