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
            
        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
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