If all the worlds were formed in one place, they will all possess the ingredients for life. Perhaps lucky not only Earth. Yet of all worlds, which we found in space, Earth — for the moment — remains unique: it is the only planet on the surface, which occur in biological processes associated with life. Sounds absolutely incredible, given the fact that the laws of nature are the same everywhere, if nowhere else in the Universe is not biological processes. And yet, while we search, find, and open, our world remains the only one truly alive.
However, the ingredients of life, including the full set of stable elements in the periodic table, chemical compounds associated with the building blocks of life, and even complex organic molecules are found everywhere in space. We find them in the atmospheres of gas giants, on the surfaces of solid worlds, moons, asteroids and comets, and even gas in the depths of interstellar space.
Yes, there is a big gap between "organic molecules" and what we believe today by living organisms. Although there are a lot of interesting opportunities that may be outside of the Earth, yet we have not found any other world that can be considered "alive" and didn't find any remains of past life on other worlds. The solar system is a great place to start, because it's close and accessible. And despite the fact that while we have nothing, there are a number of intriguing possibilities for the detection of life beyond Earth in our backyard.
Here are eight worlds, which we consider to be the most suitable for the possible existence of life.Europe
The second satellite of Jupiter, Europa is too far away from the Sun, at first glance, to be a good candidate for the presence of life. But Europe has two features that allow us to think that a lot of water — much more than on the Ground, and internal heat, born by the tidal effect of Jupiter. Under the surface ice on Europa hides an enormous ocean of liquid water heated from the inside due to Jupiter's gravity could create a situation very similar to the bearing life hydrothermal vents on the ocean floor of the Earth. Hardly there you can find the life you are accustomed to seeing us on the planet, but a certain form there may survive, reproduce and evolve.Enceladus
Icy moon of Saturn is less than Europe and has less water, but its liquid ocean beneath the surface of solid ice) is unique: it throws a 500-mile geysers water into space. These geysers and tell us that there is liquid water, and in combination with other elements and molecules necessary for life, like methane, ammonia and carbon dioxide, there could prestiti life. In the oceans of Enceladus. Europe has more heat, water and so — so we think — more chances, but not worth to write Enceladus off, because it's the thinner ice surface and powerful eruption, which means that we can try to find life through a space mission, not even descending to the moon's surface.Mars