The number of immigrants from the ice planet

Is there life on other planets besides the earth? I believe many friends will take a positive attitude. After all, the universe is so big. If life on earth is not set and the universe is not virtual, then life on earth should be very common, although we have not found them yet.

In fact, part of the reason why scientists couldn't find extraterrestrial life before was that scientists initially took the earth as a reference sample and thought that if there was life on a planet in the universe, the planet would probably be located in the habitable area of a star similar to Earth, with appropriate temperature, abundant water resources and strong atmosphere. However, there are millions of kinds of life on the earth (according to statistics, at least hundreds of millions of kinds of life have been born on the earth since the first life was born). Therefore, life forms in the universe should also be different.

For example, before looking for life, we always focus on terrestrial planets, especially those in habitable areas, and turn them into "super earth" or "second earth". However, with the development of human science and technology in recent years, the more scientists know about the universe, the more they pay attention to other planets that have never been concerned before. For example, satellites, in fact, in our solar system, several satellites may have life.

Europa, in particular, is highly respected by scientists. If there is another planet in the solar system besides the earth that is most likely to have life (even exist), then it must be Europa. Why do scientists think so?

As an "ice and snow" planet with a surface temperature of about-163 degrees and a polar temperature of over -200 degrees, scientists believe that there is a warm ocean about 15 kilometers below Europa's thick ice, where life may have been born, and at least 3 million tons of fish live. Scientists are so artificial, not only because Europa may have a larger liquid ocean than the earth, but also because Europa has an atmosphere, and its main component is oxygen.