how to get the age of a protoplanetary disk what is the name of the disk formed by stars what is the infrared flux of a star what type of disk is an adult star why are planetary systems formed in a young star how do you know the age of the star how long does it take a protoplanetary disk to develop when do protoplanetary disks dissipate how long does a young star star dissipate? how do we know astronomy about the ages of a star how long will it take for a star to form why do stars have protoplanetary disks when does a stellar disk form how do you determine if a star is born with a protoplanetary disk? how to get infrared flux how to study what is the difference between a protoplanetary disk and an age? how can i measure the flux of a protoplanetary disk how are protoplanetary disks formed why is the protoplanetary disk an uncertainties what is it called when stars are born