 Recent observations with the Hubble Space Telescope have yielded the major discovery of protoplanetary disks within the Orion Nebula , which have been dubbed proplyds . HST has revealed more than 150 of these within the nebula , and they are considered to be systems in the earliest stages of solar system formation . The sheer numbers of them have been used as evidence that the formation of star systems is fairly common in our universe . 
