Question: What is a fairly representative project a radio astronomer might be involved with perhaps to investigate dark energy or some other equally interesting phenomenon? – Steve
Answer: As the number of interesting projects that one can do with radio telescopes is too large to list, let me list a radio telescope project that investigates the early universe. The Hydrogen Epoch of Reionization Array (HERA) is a radio telescope array that will, as the name implies, attempt to image the large-scale structure of the universe at the point when the first stars reionized the neutral intergalactic medium. This aspect of the universe is one of the last unexplored phases of the evolution of our universe.