Venus was the first planet humans ever visited. In 1962 the Mariner 2 probe flew past one of our closest neighbours. The spacecraft discovered a hostile world, a place we came to learn was much hotter and more violently toxic than any other planet in our Solar System. A runaway greenhouse gas effect had heated the planet to an average temperature of 462°C, hot enough to melt lead. Venus’s punishing environment made return missions unlikely, especially when there was lower hanging fruit in the shape of the Red Planet. But today, interest in Earth’s toxic twin is resurgent. Current tech could support longer missions that get closer to the planet’s destructive surface and discover more about its story. For all of the similarities between Earth and Venus – their size and…

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版主:icemessenger于2019_12_04 4:16:25编辑