Sure, they say they can detect things like water with that method.
But I have a doubt. Is there any other means of proving or disproving the presence of water vapour? Because if there isn't, then how can they say for sure that it's water vapour they are detecting and not something entirely different.
Anyway, I think new planets are cool.
If it wasn't for the hostile void of space, the high chance of dying etc, I'd love to be an astronaut!