NOT QUITE MARS BEST GUESS

I have often wondered about the establishing of the gas elements that make up the atmosphere of an Exoplanet.

I have also repeatedly warned of seemingly good ideas being wrong.

So here is an article that the expected discovery of the gas Methane on Mars has not been detected by the Discovery Rover. At least the maximum that can exist is only a tiny fraction of that which was predicted. 

Not a case of best guess being wrong but best guess with TESTS being wrong!

Still it is the process we go through to reach the facts.