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why people still don't live on mars?

@SimonBirch Haha I 100% agree with your message and thought the response was funny. Thank you for being chill and not ripping my head off. Best regards.
I'm fine
F: fucked up
I: insecure
N: neurotic
E: emotionally unsound
I'm fine , ha ha ha ha ha
well I found out that there's one more problem, radiation. You couldn't even live there for a week because of it.
@Marakuya said in #1:
> why don't people still don't live on mars since earth and mars have a lot in common.

Other than being rocky planets with similar axial tilt and moon(s)? Not all that much:

Mars doesn't have a magnetic field, so ionising radiation from space will present a health hazard for would-be colonisers. It's much smaller than Earth (one fourth of the surface area of Earth) and has a weaker gravitational field. Which would lead to muscular atrophy if untreated (special sports regiment would be required for colonists). There's no liquid water on mars (compared to Earth, where water is nearly ubiquitous and drinking water is at least somewhat common). Water is essential for all life on Earth, so that presents a problem. Water on Mars is only found as a solid in the form of polar ice caps.

Because of the lack of a proper magnetic field Mars has a rarefied (extremely thin) atmosphere that continues to keep losing atoms to space due to the interaction of the solar wind with the planet's ionosphere. The mean atmospheric pressure at the surface is only 600 Pa, compared to Earth's 101,300 Pa. So only about 0.6% of Earth's pressure. The Martian atmosphere also consists almost entirely of CO2 (which humans cannot breathe), oxygen is only found in trace amounts. Even if the gas mixture and pressure of the Martian atmosphere were more Earth-like, you probably wouldn't want to breath it for an extended period of time, because it's quite dusty, containing lots of particulate matter.

Either way, it's freakishly cold on Mars (especially near the poles where you'd want to be due to the only source of water being located there): temperatures dip to −110 ºC (−166 ºF) during the Martian winter, while they shoot up to 35 ºC (95 ºF) in the summer (on the equator). However, the ultra-thin atmosphere would mean that the heat transfer from the "air" to your skin would be much slower than on Earth, so it wouldn't feel like 35ºC on Earth (it would feel much colder). The Martian year is about twice as long as the Earth year, so Winter is also twice as long.

Because Mars is about 50% further from the sun than the Earth is, it receives less light (and less heat) from it, only 43% of Earth's sunlight. The sun would also appear smaller in the sky. The most prominent "weather phenomenon" on Mars are the frequent (global) dust storms. Yeah, not great.

> well one thing is if you weight 20 pounds on earth you would weight only 7.6 pounds on mars!

That's correct and it probably would not be good for your muscles. They would soon become weak if you didn't prevent it.

> And also there were 3 mars rover and looks like there a problem other wise people would live on mars.

As I said above, there are a lot of problems for life as we know it on Mars. It's doubtful that even microbial life exists anywhere on Mars (so far there's no evidence for life there).

> But in fact there 20% that there is air on mars! Why only 20%? well air or oxygen comes from trees. and theirs no trees on mars. but makes the 20%? Well there are living things on mars! But there more. pls tell me it

There definitely is an atmosphere on Mars, but it's not air as we know it. It barely contains nitrogen (the main ingredient of Earth's air) and very, very little oxygen (the second most abundant gas in Earth's atmosphere). Instead the atmosphere of Mars is mostly (96%) made of carbon dioxide. Trees cannot exist on Mars due to the lack of liquid water. There are no living things at all on Mars as far as is known. Not even shrubs, not even lichen.
well acutely there's just a lot less oxygen on mars. Ray Bradbury an astronomer said that there is at least living bacteria on mars. and bacteria need oxygen, But did you know that 1 year is about 690 earth days.
There's no water for the plants which disables them to do photosynthesis, the procees by which plants make their food and release oxygen. There's ice on the poles, bbut we can't use it as it doesn't melt but sublimates directly to water vapour.