Going to preface and say this type of music isn't everyone's cup of tea, but over the last few years I've become a huge fan of Two Steps From Hell and one of their composers, Thomas Bergersen. They primarily make epic cinematic-style music. Odds are everyone has heard several cinematic trailers featuring their music.
Bergersen is in the process of releasing a seven chapter album series entitled Humanity, each album explores different themes related to (shockingly!) humanity. Chapter IV just released in the past week, and it is a sci-fi themed album about human exploration and achievement. This track titled "Apollo" Bergersen wrote in honor of the Apollo space program.