Humans are no less curious about Mars than they are about Earth, and humans have always treated Mars as a second habitable planet.

Indeed, in the solar system, Mars is the most habitable planet. Mars has a lot of similarities with the Earth, in terms of volume, mass, density, and other aspects are similar to the Earth, so human beings will be so convinced that Mars can survive.

However, as people's understanding of Mars continues to deepen, scientists have changed their usual attitude. Perhaps Mars may not be suitable for human habitation at all, nor can it be a second home for humans.

Except for mountains and rivers, the rest of Mars is a desert with limited natural resources, including a lack of readily available food, water, and breathable air.

This scarcity makes it challenging to sustain human life without a strong infrastructure and supply of resources from Earth.

Although there is evidence of water ice on Mars, the majority of it is frozen in polar ice caps or underground. The thin atmosphere also makes it challenging for liquid water to exist on the surface, as it evaporates quickly.

Mars experiences extreme temperatures, with average surface temperatures ranging from around -80 degrees Fahrenheit (-62 degrees Celsius) in winter to -200 degrees Fahrenheit (-129 degrees Celsius) in summer. These temperatures are too harsh for human survival without proper protection.

In addition, mars has a thin atmosphere, consisting mostly of carbon dioxide, with very little oxygen. This makes it difficult for humans to breathe and survive without specialized equipment.

Mars has a much thinner atmosphere compared to Earth, which means it provides less protection against harmful radiation from space. This could pose significant health risks to humans over an extended period without adequate shielding.

In addition, there are a lot of perchlorates on Mars. Once human skin touches these substances, it will easily cause skin diseases, and it will be even more dangerous if it accidentally enters the respiratory tract. Such a dangerous place is not suitable to be our home at present.

Despite these challenges, scientists are actively exploring ways to make Mars more habitable in the future, including potential terraforming projects and the development of technologies that could provide better protection and sustainability for human colonization.

Perhaps, in the distant future, we will be able to solve these basic problems, and then Mars may be inhabited by humans.