The Sense HAT is an add-on board for the Raspberry Pi computer that was specially created for the Astro Pi Challenge. This video explains how to assemble the Sense HAT contained in the Astro Pi Kit.
The Astro Pi kit is the only tool teams participating in the European Astro Pi Challenge can use to design their experiment.
The European Astro Pi Challenge is a project by the ESA Education Office, in collaboration with the Raspberry Pi Foundation, offering school students the amazing opportunity to run scientific investigations on the International Space Station (ISS) by means of computer coding.