Tom Stallard and Henrik Melin, planetary scientists from Leicester University in the UK, have arrived at Mauna Kea, Hawaii, for an observing run of Saturn. They are going to be using the Keck and NASA Infra Red Telescope Facilities to support observations from the Cassini spacecraft's VIMS instrument (to find out all about VIMS, see: http://wwwvims.lpl.arizona.edu/ . On 12th April, they will be joined by Europlanet's Steve Miller. Tom, Henrik and Steve will be blogging about their time up the mountain, here on the Europlanet Blog. We are also going to be setting up some live chats, so you can ask them questions and get live feeds of some of the things that they will be looking at.