If we don't wear spacesuits, how long can we survive on other terrestrial planets in the solar system?

In our solar system, there are eight planets, as well as some dwarf planets, satellites and other celestial bodies. Because these celestial bodies are at different distances from the sun, each planet receives different solar heat. The closer you are to the sun, the more heat you receive from the sun and the higher the temperature. The farther away from the sun, the less heat it receives from the sun and the lower the temperature. Among the eight planets in the solar system, there are four terrestrial planets. How long can we survive if we stand directly on these terrestrial planets without wearing spacesuits?

Although both Mercury and our Earth belong to Earth-like planets, as Mercury is the closest celestial body among the eight planets, its average distance from the sun is about 57.9 million kilometers. Therefore, mercury receives a lot of heat from the sun. In addition, the atmosphere of Mercury is relatively thin, so the surface of Mercury is basically directly exposed to the sun's baking. During the day, the surface temperature of Mercury may reach 430℃, while at night, the temperature will drop sharply to-160℃, and the temperature difference between day and night will almost reach 600℃. In this environment, if we humans are directly exposed to the surface of Mercury, how long can we survive? It will only last for a few seconds. Because in the thin atmosphere, the pressure difference inside and outside our bodies will be very large, and at this time we are like an inflated balloon, which will soon burst. In addition, the high temperature of mercury will directly cook us.

Venus is the closest terrestrial planet to the sun in the solar system, with an average distance of about 654.38+0.082 million kilometers. Although the distance between Venus and the sun is farther than that between Mercury and the sun, the surface temperature of Venus is higher, estimated to be between 465℃ and 485℃. In addition, Venus's atmospheric pressure is also very high, which is equivalent to the pressure at the depth of the earth 1000 meters and 92 times that of the earth. The point is that it often rains with sulfuric acid on Venus. So the environment of Venus is very bad. If we humans are directly exposed to the surface of Venus, we will not only be baked at high temperature immediately, but also be crushed by great pressure. If we only encounter acid rain on Venus, we may even be directly corroded by sulfuric acid, and there may be nothing left. We estimate that this situation can only last for a few seconds.

The earth is our home, the most pleasant earth-like planet in the solar system, and it has bred countless kinds of life on the earth, including us. Because of the beautiful environment and suitable temperature, the earth is our ideal home for human beings. How long can we humans survive on the earth? For individuals, everyone's life time on the earth is not uniform, some will be long, and some will be short. Judging from the current average life expectancy of human beings, we humans can live on the earth for an average of 80 years. Of course, with the continuous development and progress of medical technology, the average life expectancy of our human beings should be significantly improved.

Although Mars is a terrestrial planet in the solar system and is in the livable zone of our solar system, the environment of Mars is also relatively harsh. Although liquid water once existed on Mars in ancient times, it is now very dry and the atmosphere is very thin. In addition, the distance between Mars and the sun is relatively far, about 228 million kilometers, so the temperature of Mars is relatively low, about -5℃ during the day and -87℃ at night. Without considering other factors, at this temperature, we humans will live longer than when we were on Mercury and Venus, but we will soon be frozen. Because the atmosphere of Mars is very thin, we are directly exposed to the surface of Mars, which is similar to that of Mercury. We may be like a "balloon" with a great pressure difference between inside and outside, and some organs may explode soon. So, we won't last long.

Because the main goal of our search for livable planets is terrestrial planets, that is, rocky planets similar to our earth, we will not discuss how long we humans can survive on the surface of the four gaseous planets in the solar system. Judging from the situation of the four terrestrial planets in the solar system, the situation of each planet is different, so we humans live on these terrestrial planets for different times. On some planets, we humans may end our lives immediately, while on some planets with relatively suitable environment (such as our earth), we humans have lived for a long time. This difference is really too big.

Of course, this is only a hypothetical topic. At present, we humans have not really set foot on the surface of these alien planets. Even in the future, when we land on these planets, we will not be directly exposed to these environments, but wear professional spacesuits. These astronauts can protect us from threats such as high temperature, high pressure, low pressure and radiation. Therefore, in the case of wearing spacesuits, it is no problem for us humans to survive on other planets.

Over the years, we have often seen topics such as interstellar flight and interstellar migration. If we humans really realize interstellar migration in the future, it should be very inconvenient to wear spacesuits all the time in our new home. Therefore, if we immigrate to stars in the future, the preferred planets should be those which are very similar to our earth, with suitable temperature, dense atmosphere containing oxygen, magnetic field and other conditions. On such a planet, we humans should be able to directly expose ourselves to the environment instead of wearing heavy spacesuits. However, from the current detection situation, we have not found some livable planets that are very similar to the earth. Therefore, if we start interstellar migration in the future, we may build a closed city and create a mini-ecosystem on a planet like Mars. In this ecosystem, we humans can also live like the earth. However, such technology can be very difficult and costly.