What is a T-Tauri star? Naim 00:52 Astronomy 101 What is a T-Tauri star? a) a collapsing cloud of gas about to become a protostar b) a dying star c) a cool main sequence star d) a star releasing a planetary nebula e) a protostar about to become a star Answer: e) a protostar about to become a star Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+