Left Mouse Button: Click to select object, Click and hold to look around.Old version of SpaceEngine (free download).This is not a political board nor a place to discuss ongoing world events, Hollywood drama, or anything that is not related to SpaceEngine. In summary, due to the scale height of the Martian atmosphere, if you manage to build an atmosphere that is approximately Earth-density at some reasonable sea level, there is no altitude limit to plants at all on the planet - not just the base of Olympus Mons is possible, but even the crown.Welcome to /r/SpaceEngine! This is the Reddit community for the universe simulator, SpaceEngine. Looking at a Mars as your described, we modeled the atmospheric density variation with altitude and found that our Everestian plants would be happy (barely!) at the top of Olympus Mons. So, recap: We used a somewhat conservative starting point for where plants can live, because it's likely that plants on Everest are as much limited by temperature as by pressure. This is an interesting number, because it just exceeds the altitude of Olympus Mons at 22.1 km. So our plants are growing at 22.5 km Martian reference altitude. The lowest point on Mars, Hellas Planitia, is about 6 km below this so your sea level is 5.7 km above the Martian reference altitude. Martian reference altitude is defined today somewhat arbitrary as the 610.5 Pascal isobar. Let's sanity check this, and for this we have to get into "sea level" references a bit. we want to call that sea-level pressure altitude 11.7 km as the question suggests, this puts our moss at around 28.5 km above the lowest point on mars.
This is from whatever altitude the 0.975 pressure holds - if. Therefore, our plant that is comfortable at 21,260 ft (6,480 m) is comfortable on Mars at 54,630 ft (16,650 m). However, our reference pressure is a bit lower, so we'll scale by that 0.975 factor to have equivalent pressure at 2.57x the height of reference. The scale height of a Martian atmosphere with the same temperature, composition, and pressure as Earth's goes with the relative surface gravities, so it's about 2.64x higher than Earth. This is likely more limited by temperature and just how few opportunities there are to grow higher - but let's use it as a starting point. On Earth, plants are found about as high as they could be - "the highest-altitude plant species is a moss that grows at 6,480 m (21,260 ft)" according to Wikipedia. (Mike Sertas answered most of this, but let's pull it together.)
Has sufficient amounts of greenhouse gases to keep it at an average temperature of 12 to -3 Celsius.An artificial magnetic field orbiting the Lagrange 1 point.Average surface pressure of 0.975 atm and still rising.If Mars theoretically is habitable, can plants grow on Tharsis Rise or even on the base of Olympus Mons? Since lower gravity planets tend to have a greater height differences in terms of geography but at the same time, a lower climate difference with regards to the vertical axis, at what altitude can plants grow before reaching their limit? How high can plants grow on a low gravity planet like Mars? (My Universe Sandbox Almost Terraformed Mars)
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