The Mercury Planetary Orbiter (MPO), Mercury Magnetospheric Orbiter (MMO), Mercury Transfer Module (MTM): all of these three spacecraft will form a single craft going on a scientific mission to better understand planet Mercury. The mission is called “BopiColombo” and belongs to ESA (the European Space Agency) and JAXA (the Japan Aerospace Exploration Agency.) Launched back in 2018 and arriving in 2025, the BepiColombo spacecraft are special in that they’re going closer to the Sun and into an orbit around Mercury which is difficult given the effect of the Sun’s gravity on the spacecraft. On reaching the planet, each spacecraft will separate to its decided orbit and get to performing science on the planet.