Because Mercury is so close to the Sun, it is hard to directly observe from Earth except during dawn or twilight when the Sun's brightness doesn't outshine little Mercury. The first spacecraft to visit Mercury was NASA's Mariner 10, which imaged about 45% of the surface. NASA's MESSENGER spacecraft flew by Mercury three times and orbited the planet for four years before crashing on its surface at the end of its mission. The European Space Agency and JAXA launched a joint mission to Mercury in 2018. The mission, called BepiColombo, is made up of two spacecraft. Nine flybys are planned to help steer the spacecraft into orbit in late 2025. ~ NASA

由於水星離太陽非常近，因此很難從地球上直接觀測到，除非在黎明或黃昏時太陽的亮度不會超過小水星。 第一個訪問水星的太空船是 NASA 的水手 10 號，它對水星約 45% 的表面進行了成像。 美國太空總署的信使號太空船三次飛越水星，並繞著水星運行四年，然後在任務結束時墜毀在水星表面。 歐洲太空總署和日本宇宙航空研究開發機構 (JAXA) 於 2018 年啟動了一項前往水星的聯合任務。 計劃在 2025 年底進行 9 次飛越，以幫助太空船進入軌道。 ~ NASA

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