http://www.space.com/24625-oldest-star-universe-discovery.html

Above is a link to an article about the oldest star in the known universe which is called SMSS J031300.362670839.3. What makes this start particularly interesting is due to its age and composition. This star is the oldest known star in the universe (from our perspective) because of how little mass it has. This shows to us that early stars may have been composed of lighter elements than modern generation stars meaning that they have less iron and more carbon. This is profoundly different from the current measurements of modern stars (especially of our own) and tell us the early development of our universe may have been different than what we had expected.