The 11 biggest space missions of 2021

A trio of Martian missions, February

Mars will welcome the arrival of not one, not two, but three missions—each launched and operated by a different nation. There’s the Hope orbiter by the United Arab Emirates, the Perseverance rover launched by NASA, and the Tianwen-1 mission (with orbiter, lander, and rover) launched by China. All three missions will reach Martian orbit in February, with Perseverance making its way to the surface later that month, followed by Tianwen-1 in April.

Hope will be helping scientists answer atmospheric questions like why the planet hemorrhages hydrogen and oxygen. Tianwen-1 and Perseverance will be looking

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