[The other Syaoran has a pretty distinct aura and ki (thanks to Reasons) so Time can detect him off doing Syaoran things. Which means this boy is...]
Well! I know lots of things. Did you know that spaceships have to have really excellent air conditioning systems in place, because if they don't the people inside would overheat? Even though space is so cold! It's because of how hot the machinery gets and the light from nearby stars.