What young stars teach us about the birth of our solar system

The familiar star at the center of our solar system has had billions of years to mature and ultimately provide life-giving energy to us here on Earth. But a very long time ago, our sun was just a growing baby star. What did the sun look like when it was so young? That's long been a mystery that, if solved, could teach us about the formation of our solar system--so-named because sol is the Latin word for sun--and other stellar systems made up of planets and cosmic objects orbiting stars.