Which instrument would be most suitable for investigating conditions in the universe a few hundred thousand years after the Big Bang?
a. an ultra-violet telescope in orbit around Jupiter
b. a tank of chlorine deep inside Earth
c. a gamma-ray or high-energy x-ray telescope in orbit
d. a satellite with infrared and microwave telescopes on board
e. a small refractor (which gathers visible light) on a college campus, but pointed in just the right direction