Pressure builds on Pluto

Ref: http://physicsweb.org/article/news/7/7/7

New observations of Pluto reveal that surprising changes have occurred
in the thin nitrogen atmosphere of the distant planet since 1988. Two
international teams of astronomers led by James Elliot of the
Massachusetts Institute of Technology in the US and Bruno Sicardy of the
Observatoire de Paris in France exploited Pluto's chance `occultation' of
background stars in July and August last year to probe the tiny planet's
atmosphere (Nature 424 165 and 168).

See: http://physicsweb.org/article/news/7/7/7