Well, it looks official now. Charon (Pluto’s moon) has no atmosphere.

Why any one thought it actually had any is beyond me, and probably no longer open for debate…, however as reported by the BBC.

By watching as Charon eclipsed a distant star last June, they were able to determine that the speed the light (from the star) was cut off signalled the lack of any atmosphere.

You can read more at http://news.bbc.co.uk/1/hi/sci/tech/4588628.stm