Yinghuo-1 (simplified Chinese: 萤火一号; traditional Chinese: 螢火一號; pinyin: Yínghuǒ yī hào) was a Chinese Mars-exploration space probe, intended to be the first Chinese spacecraft to orbit Mars. It was launched from Baikonur Cosmodrome, Kazakhstan, on 8 November 2011, along with the Russian Fobos-Grunt sample return spacecraft, which was intended to visit Mars’ moon Phobos.[2][6] The 115-kg (250-lb) Yinghuo-1 probe was intended by the CNSA to orbit Mars for about two years,[1] studying the planet’s surface, atmosphere, ionosphere and magnetic field.[7] Shortly after launch, Fobos-Grunt was expected to perform two burns to depart Earth orbit bound for Mars. However, these burns did not take place, leaving both probes stranded in orbit.[8] On 17 November 2011, Chinese state media reported that Yinghuo-1 had been declared lost by the CNSA.[9] After a period of orbital decay, Yinghuo-1 and Fobos-Grunt underwent destructive re-entry on 15 January 2012, finally disintegrating over the Pacific Ocean.[5][10]
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