Space probes launched in 2004

robotic space probe which orbited comet 67P/Churyumov–Gerasimenko

robotic European Space Agency lander that accompanied the Rosetta spacecraft

MESSENGER was a NASA robotic space probe that orbited the planet Mercury between 2011 and 2015, studying Mercury's chemical composition, geology, and magnetic field. The name is a backronym for Mercury Surface, Space Environment, Geochemistry, and Ranging, and a reference to the messenger god Mercury from Roman mythology.