The headline is interesting on its own, but I was actually more curious about the breakdown of chemicals available in Martian soil. One of the things that makes the Moon less attractive as a site for a permanent colony is the lack of elements needed for organic life. Having enough nitrogen available in the soil to have once supported life suggests that agriculture on Mars might be sustainable without outside intervention (ie launching nitrogen rich asteroids at the surface of the planet.) Nitrogen is essential for plants and other biological processes. In addition, nitrogen currently represents less than 3% of Mars' scant atmosphere, a figure that would have to be raised during any attempt at terraforming.
Having recently finished the last book in Liu Cixin's instant classic "The Remembrance of Earth's Past" series, Death's End, I can only report a feeling of total amazement and awe. There is so much about this novel that blew my mind, that offered different and better ways of viewing the universe. This novel did what I wish more novels would, serve up a new universe entire, evoking beauty and horror, nobility and disgust, in a timeless monument to unfettered speculation. Obviously, in discussing the events of the last of a trilogy books, spoilers are to be expected. I am, however, going to try to avoid discussing much beyond the first 100 pages of the third novel. I read the translation of this novel, as ushered into being by the amazing talent of Ken Liu. Ken has written of a certain prickliness when it comes to translating work. He makes an effort not to anglicize the source material, not smudging away the occasional difficulties in bringing Cixin...

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