It is difficult to go to the moon now. What is the point of scientists looking for habitable planets in other galaxies?

Although it is difficult to go to the moon now with the current level of science, technology and economy, this will not affect scientists' search for habitable planets in other galaxies, because it is always good to prepare for a rainy day. It's always too late to think of solutions until the last minute. Until now, most people still believe that Earth is the most ideal planet imaginable. To be precise, what scientists call habitable planets generally refers to Earth-like planets, not habitable planets in the full sense.

When scientists judge whether a planet is habitable, they mainly consider the following aspects. Whether there are sufficient nutrients in water, air, and soil, and whether there are severe storms. There is a concept of "habitable zone" in astronomy, which refers to the range within which intelligent life may exist, or the conditions for human survival are met. For example: the center of the Milky Way cannot be too close, because they are all massive objects that produce too many high-energy rays, which poses a great threat to life. It cannot be too far away, because if it is too far away, it is difficult for heavy elements to exist.

So far, some scientists have put forward some new ideas, and they require that we expand our thinking in finding habitable planets. Some satellites can obtain energy from the reflected light source of the giant planets next to them. Tidal forces will also repeatedly bend the shells of the satellites, and the friction generated will heat the satellites from the inside, thus turning them into habitable stars.

So far, scientists have discovered that Proxima Centauri b is a planet about the same size as the Earth located in the habitable zone of the Proxima Centauri galaxy. Perhaps due to the inability to bind the surface atmosphere, the surface of Proxima Centauri b Exposure to harmful stellar radiation while reducing its habitability potential.