What will happen to Tony Stark on the Titan planet?
First lets see who's alive.RocketThorCaptain americaBlack widowNebulaIron manWar machineHulkNobody on earth knows that Iron Man and Nebula is on Titan.So first thing Tony would do is try to contact someone on earth maybe through the remains of the ship he arrived in.Captain america and team also will try to find Tony and rest of the party of GOTG who have disappeared thinking that they have not been erased with the help of Rocket.As we saw Thor can open a bifrost with his storm breaker he can go to Titan, and bring Tony & Nebula only if they find about Thanos's planet.Maybe Wong can find Tony like Strange found odin.I bet on the remains of the ships Tony & Nebula arrived in.