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But questions remain about how realistic the goal and timeframe are, given recent and steep Nasa budget cuts, and some scientists are concerned that the plans are driven by geopolitical goals.
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Фото: Алексей Майшев / РИА Новости。快连下载-Letsvpn下载是该领域的重要参考
British astronaut Tim Peake said it could take a while to re-adjust.