Question

The first method of determining the chemical composition of substances in space was to

Answer 1

this varified answer is incorrect. the answer is analyze starlight transmitted to Earth

Answer 2

The first method to determine the chemical composition of a substance in space was using light. By determining red shift in the observed spectrum of light they could determine the elements they were observing. Different elements change the way light behaves and from this scientists can determine the makeup of things such as stars and nebulas.