Since long ago, many scientists have done researches on possibility of life on Mars and this planet becomes our target to be human being habitat. It is speculated by them that the similarities between earth and Mars in some properties become the reason why Mars targeted to be our new habitat as earth is getting older and sick day by day.

By the mid-19th century, knew that Mars have some similarities to earth such as the length of a day is nearly equal to how long is one day on earth. It is believe that Mars also have four seasons just like the earth does. Unfortunately, the period of a year is a little bit longer than a year on earth as the orbit of the Mars is longer than earth. So, a baby on Mars has to wait longer to celebrate his first day. The observations by the astronomer on surface of Mars show the existence of water on darker region of the planet and land on the brighter side. It seems a good news for us as it shows how compatible Mars for our lives.

Spectroscopic analysis of Mars' atmosphere began in earnest in 1894, when U.S. astronomer William Wallace Campbell showed that neither water nor oxygen were present in the Martian atmosphere By 1909 better telescopes and the best perihelia opposition of Mars since 1877 conclusively put an end to the canal theory.

The photographs taken by the Mariner 4 probe in 1965, showed an arid Mars without rivers, oceans or any signs of life. Further it revealed that the surface (at least the parts that it photographed) was covered in craters, indicating a lack of plate tectonics and weathering of any kind for the last 4 billion years. The probe also found that Mars had no protective magnetic field, meaning that intense UV radiation makes the planet extremely hostile to life as we know it. The probe was also able to calculate the atmospheric pressure on the planet to be between 4 and 7 millibars, meaning that liquid water could not exist on the planet's surface. After Mariner 4, the search for life on Mars changed to a search for bacteria-like living organisms rather than for multicellular organisms, as the environment was clearly too harsh for these.

Observations made in the late 1990s by the Mars Global Surveyor confirmed the suspicion that Mars, unlike Earth, no longer possessed a substantial global magnetic field, thus allowing potentially life-threatening cosmic radiation to reach the planet's surface. Scientists also speculate that the lack of shielding due to Mars's diminished global magnetic field helped the solar wind blow away much of Mars's atmosphere over the course of several billion years.

No Mars probe since Viking has tested the Martian soil directly for signs of life. NASA's recent missions have focused on another question: whether Mars held lakes or oceans of liquid water on its surface in the ancient past. Scientists have found hematite, a mineral that forms in the presence of water. Many scientists have long held this to be almost self-evident based on various geological landforms on the planet, but others have proposed different explanations—wind erosion, carbon dioxide oceans, etc. Thus, the mission of the Mars Exploration Rovers of 2004 was not to look for present or past life, but for evidence of liquid water on the surface of Mars in the planet's ancient past.

So, it is enough to prove that Mars can be our next habitat since earth no longer able to provide us lives. As people keep on destroy this earth, it seems to me that the Mars couldn’t wait for our presence there.