Life beyond space is a topic that has undergone much discussion. According to current knowledge, we must admit to ourselves that most planets in the Solar System have proven hostile. Prior to the Space Age, Venus was thought to have at least oceans, which contained some sort of primitive life. We now know that the surface temperature of Venus is more than nine hundred degrees fahrenheit. The atmosphere is chiefly made up of carbon dioxide and clouds which contain sulfuric acid. Mercury is devoid of atmosphere and Mars, the least unfriendly planet lacks a useful atmosphere.
It is all speculative that alien life exists on Jupiter. There is no scientific evidence to support such speculations. Although the chance of finding microorganisms on Mars cannot be ruled out, the results of the Viking missions have proven totally negative in that regard. Scientifically speaking, it appears that there is no life in the Solar system except on Earth.
It is believed that solar systems are common in the Universe, and what happened to the Sun can also happen with other stars. Therefore, it is logical to assume that other planets that have a sun similar to ours are inhabited. In our Solar System, Earth is the only planet that is able to support advanced life forms. Earth lies at the center of the Sun’s ecosphere, the area around the Sun that is neither too hot nor too cold for life to exist. Mars is located on the outer edge of the ecosphere and Venus is on the inner edge.
There are countless stars similar to the Sun in our Galaxy. For example Ceti, the twentieth closest star to Earth. It has the same type of spectrum, temperature, and other properties as our sun. It is because of this data that there is search for life elsewhere in the Universe.