# Would this Planet be habitable for humans

I Was playing space engine and i was looking for a planet like Earth for quite some time and then i stumbled on this beautiful world covered with liquid water which orbited a main sequence star with 8 other planets that ticked most of the boxes for human survival, with a small plot of land. This planet is 77% Earths diameter, 0.47 times Earth's mass, 0.78 G surface gravity, and its Rotational period is 2.3 earth days about (55 hours long) and its orbital period is about (766 Earth days) in total, and its temperature ranges from 25-38 centigrade. Even with these close similarities it was the atmospheric composition which caught my eye, its atmospheric pressure is 0.5atm (Half of the earths surface pressure) and its atmospheric composition consists of: N2 = 40.5% CO2 = 31.4% O2 = 26.4% H2O = 1.5% SO2 = 0.136% CH4 = 955 ppm C2H6 = 75.5 ppm

Are these conditions safe for human beings to live in?

• That's a MASSIVE amount of CO$_2$ in that atmosphere! 31% CO$_2$ is unlikely to be survivable for humans, though I don't have any data at hand to back that up and don't have the time at the moment to dig it up. – a CVn Sep 26 '16 at 16:59
• Yeah I was worried about the level of carbon dioxide – JDAstro Sep 26 '16 at 17:00
• Is this related to worldbuilding.stackexchange.com/q/55875/29? How about you just take Earth's atmosphere and give it a few tweaks here and there? The planet looks sounds at first glance, except quite warm for its distance from its star but that would depend a lot on the star. – a CVn Sep 26 '16 at 17:02
• Well i found another problem. this specific body is located within the galactic centre of the milky way galaxy so there would be over 10 million stars or more per 10-5 light years – JDAstro Sep 26 '16 at 17:05
• It was a good idea though – JDAstro Sep 26 '16 at 17:06