a space scientist and astrobiologist.
\n\nI'm here today to answer your questions from the internet.
\n\nWhy is Mars red if not for the devil's light?
\n\nMars is red for the really simple reason
\n\nSo it has metals that make it look red.
\n\nIt's not because of the devil's light,
\n\nbecause it's literally boiling or something like that.
\n\nMars is cold and rusty, and that's why it looks red.
\n\n'You can only depart to Mars once every two years?'
\n\nand that means that they're different distances apart
\n\nfrom one another at different times.
\n\nEarth orbits close to the sun pretty quickly.
\n\nMars is farther away and it orbits the sun more slowly
\n\nbecause it has more distance to go.
\n\nAnd that's why a Mars year is two Earth years.
\n\nall the way around the sun relative to Earth.
\n\nSo you want to go between Earth and Mars
\n\nwhen they're closest together rather than when
\n\nEarth and Mars are on opposite sides of the sun.
\n\nFundamentally, that difference in the length of the year
\n\nis where this idea of launch windows comes from.
\n\nHow realistic were the crop growing scenes
\n\nIt was also a great book. I really like The Martian.
\n\nAnd…
Original source: https://www.wired.com/