NASA is inviting all citizens of planet Earth to take part in a two-day coding marathon in April.

Called the International Space Apps Challenge, the idea is to develop software for various purposes to support NASA’s mission.

The challenge will take place in several cities on all continents around the globe.

Challenges being put forth include developing hand-held hardware for upcoming space missions, determining the size of the Earth itself, access to a variety of NASA datasets and observations, and design of a consistent open data API for NASA.