http://www.progarchives.com/artist.asp?id=3348 - Astro Can Caravan were formed, according to their short-on-info website and Myspace, in 2001 in Kuopio in Finland by Otto Eskelinen, Pharaoh Pirttikangas, Tomi Kosonen and Tuomas Eriksson.
The band has gone through a lot of personnel changes ever since, with at least 35 people that have played in ACC in some line up or another.
According to Pentti Dassum from ACC, the 2007 line up of ACC is: Otto Eskelinen, Pharaoh Pirttikangas, Rasmus Pailos, Jusu Berghäll, Tuomas Eriksson, Tuomo Kuure, Pauli Lyytinen, Tomi Kosonen and Pentti Dassum ("give or take a few people, depending on the traveling distance... we live around finland, on a radius of ca 600 km from each other").
ACC are as Crucial Blast puts it a “jazz / prog / abstract / free-skronk-noise collective/orchestra”. Their albums 21st Century Drifting Episode and Questral Places will please listeners into jazz and avant-rock, and who like rhythmic and groovy textures, varied instrumentation and variety and richness of sound.

Having heard only Questral Places so far, i am convinced that their other albums are as great as QP, which i find to be a really worth listening.

Another excellent band, great recommendation!