On which planet can there be living creatures?

I may have read the stories of aliens or aliens, but also in films etc., the stories of aliens can be seen. However, there is currently no living thing on any planet other than Earth. Scientists are researching whether living things or aliens live on other planets and celestial bodies outside the solar system. Even if there are living beings on planets millions of light years away, they cannot be seen, but by studying the atmosphere of the planet etc., scientists can get an estimate. Scientists have determined on which planet life is possible.

No planet is so close to the sun where it gets very hot and not so far away that it gets very cold. There should be water on the planet. The body structure of an organism is carbon dependent. So it must be carbon on the planet. Organisms need land. Some planets are just cloud spheres. Scientists have discovered thousands of possible planets that follow such conditions. It is called Extra Solat Planet. But no alien-inhabited planet has yet been found.