关于这张图
The European Space Agency's (ESA) Earth Return Orbiter (ERO) would be the biggest spacecraft to ever orbit Mars. The spacecraft would also be the first interplanetary spacecraft to rendezvous and capture hardware launched from another planet and return it to the Earth's surface, making a full round trip to Mars and back. ERO would be a multi-stage modular spacecraft equipped with both chemical and solar electric propulsion. The electric propulsion system would be the most powerful ever flown on any previous planetary mission. ERO would carry a radiation monitor to measure the total …
