Flexi Says: Right now and for the foreseeable future, humans can only live on Earth. Humans have not traveled very far into space. The Moon is the only other place humans have visited. No other planet in our solar system currently has the conditions to support life as we know it on Earth.
There are so many variables involved that it's nearly impossible to find the perfect planet. In recent years, scientists have discovered a large amount of exoplanets, but close to none of them could actually support human life.
In 2020, Gilbert and others announced the discovery of the Earth-size, habitable-zone planet d, which is on a 37-day orbit, along with two other worlds. The innermost planet, TOI 700 b, is about 90% Earth's size and orbits the star every 10 days.
Theory of Life
The orbit must lie in the “habitable zone” where the exoplanet's surface is just the right temperature for liquid water to exist. Every form of life we know requires liquid water, so an exoplanet too close or too far from its host star is less likely to contain life.
Most astronomers feel that it would be impossible for life to exist on Venus. Today, Venus is a very hostile place. It is a very dry planet with no evidence of water, its surface temperature is hot enough to melt lead, and its atmosphere is so thick that the air pressure on its surface is over 90 times that on Earth.
Potential for Life
The surface of Pluto is extremely cold, so it seems unlikely that life could exist there. At such cold temperatures, water, which is vital for life as we know it, is essentially rock-like. Pluto's interior is warmer, however, and some think there could even be an ocean deep inside.
Uranus' environment is not conducive to life as we know it. The temperatures, pressures, and materials that characterize this planet are most likely too extreme and volatile for organisms to adapt to.
Jupiter's environment is probably not conducive to life as we know it. The temperatures, pressures, and materials that characterize this planet are most likely too extreme and volatile for organisms to adapt to.
Tough Place for Life
It is unlikely that life as we know it could survive on Mercury due to solar radiation, and extreme temperatures.
Yet the fact remains that the astronauts will be unable to live on Mars except in very restricted conditions; they will have to stay inside their capsules, inside a base or inside their space suits. Mars is not suited to human visitors.
Average number of planets with potential to support life.
Three (Venus, Earth, and Mars) out of eight planets might be able to support life.
NASA scientists have identified a planet like Earth
Named TOI 700 e, this new planet orbits within its star's habitable zone, which also hints at the presence of water on its surface.
This planet, named TOI-700 e, falls within its star's habitable zone, meaning the newfound planet could be capable of supporting life as we know it. The research team announced the finding Jan. 10 at the American Astronomical Society meeting in Seattle.
Saturn's environment is not conducive to life as we know it. The temperatures, pressures, and materials that characterize this planet are most likely too extreme and volatile for organisms to adapt to.
From top: Mercury, Venus, Earth and Mars. The planets Mercury, Venus, Earth, and Mars, are called terrestrial because they have a compact, rocky surface like Earth's terra firma.
Because of the Moon's sparse atmosphere, there is no protection from meteorites or radiation. The temperature fluctuations on the Moon are also intense, ranging from -248 to 123 degrees Celsius (-414 to 253 degrees Fahrenheit). To make the Moon habitable, we would need to live in shelters.
Robert Zubrin has pointed out that Titan possesses an abundance of all the elements necessary to support life, saying "In certain ways, Titan is the most hospitable extraterrestrial world within our solar system for human colonization." The atmosphere contains plentiful nitrogen and methane.
Neptune's environment is not conducive to life as we know it. The temperatures, pressures, and materials that characterize this planet are most likely too extreme and volatile for organisms to adapt to.
Exploring the surface of Venus is difficult because of the intense heat and crushing air pressure. The longest any spacecraft has survived on the surface is a little over two hours – a record set by the Soviet Union's Venera 13 probe in 1981. NASA's DAVINCI mission is next up with a planned probe landing in 2031.
In short, no. As an ice giant, Uranus doesn't have a true surface. The planet is mostly swirling fluids. While a spacecraft would have nowhere to land on Uranus, it wouldn't be able to fly through its atmosphere unscathed either.
Humans exposed to this level of radiation for one day would have greater than a 50% mortality rate within 30 days. Another problem is that the surface temperature of Europa averages around 90K, or -183 °C. Furthermore, the low gravity of Europa may also present challenges to colonization efforts.
No people have ever traveled to Saturn. It's too far away. At this stage there are no plans to send astronauts that far away from Earth.
The air on mars is thinner than that on Earth. On Earth, 21 percent of the air is oxygen, which is what makes it the ideal place for human life. But on Mars, oxygen makes up 0.13 percent of the air. The majority is carbon dioxide, which is harmful to humans.
Uranus and Neptune are also gas giants, so as Tyson explains point-blank, “No, forget about it.” Yep, you would only survive on each of these for less than one second. That's not even taking into account the temperatures, with Neptune averaging -373 degrees F and Uranus at -353 F.
Uranus holds the record for the coldest temperature ever measured in the Solar System: a very chilly -224℃. The temperature on Neptune is still very cold, of course – usually around -214℃ – but Uranus beats that. The reason why Uranus is so cold is nothing to do with its distance from the Sun.