There are two massive open online courses (MOOCs) available:
Sensing Planet Earth – From Core to Outer Space
Sensing Planet Earth – Water and Ice
which will start in the first quarter of 2016. The registration is open now!
Both courses are at introductory level and free of cost (with an option for verified certificates).
More information about the ideas behind this course, the target groups and the requirements can be found on http://www.chalmers.se/en/news/Pages/MOOC-Sensing-Planet-Earth.aspx