We know that the electromagnetic spectrum uses wavelengths and frequencies to determine a lot about outer space. how does it us find out the make-up of stars

Hello, Never fear papaguy is here.

Most electromagnetic radiation from space is unable to reach the surface of the Earth. Radio frequencies, visible light and some ultraviolet light makes it to sea level. Astronomers can observe some infrared wavelengths by putting telescopes on mountain tops.

~

Your pal papaguy

i think the answer is a, hope this : )