From the European Space Agency:
Collaboration between the pan-European network of students, universities and experts involved in the Student Space Education and Technology Initiative (SSETI) has been carried out via the internet.
Like a Russian doll, SSETI Express will carry inside it three smaller ‘cubesats’ – 10-centimetre cube technology testers built respectively by universities in Germany, Japan and Norway – for deployment when in orbit. The main SSETI Express satellite itself will test and characterise a propulsion system, return images of the Earth and serve as a transponder for amateur radio users.
SSETI Express measures just 60 by 60 by 70 cm across, small enough to piggyback its way to orbit on next year’s commercial Cosmos DMC-3 launch from Plesetsk in Russia.