How big is the universe? What other planet has life besides Earth?

For now, the universe is infinite.

There are many planets in the universe that produce life (there are not many but too many, too many to imagine, but there are not many high-level life forms similar to our humans, 10 million, a pitiful few, it is impossible for us to find them in our lifetime on earth.

There are 100 billion stars in the Milky Way, 14 billion light-years can be observed in the universe so far, and at least 100 billion galaxies have been discovered, which is not the whole universe, just a part, maybe just a small part, the Milky Way is only a small part of the galaxy (so small that it ignores, it has no impact on the universe. Just like a force of 100 billion people with 1 less person, it doesn't affect at all, the Milky Way is nothing more than a very ordinary galaxy. The number of planets cannot be counted, and sometimes when we look at the universe, we use the Milky Way as a reference, which is not accurate, it can't.

To say that the proportion of planets with life in the Milky Way is very small, which means that there are very few planets with life in other galaxies.

Maybe there are galaxies that are full of life).

We also often use life on Earth as the standard, that is, the life found on Earth is the most extreme.

are bacteria that live in craters 8,000 meters below the ocean floor in the Pacific Ocean (there is no light, no oxygen.

The temperature is several, extremely high pressure, all sulfides, mostly sulfuric acid. Life can survive in such conditions.

It is too narrow to think that only when the temperature is about the same as the earth, there is an atmosphere and water, there will be life, (these conditions are only for the solar system,) extraterrestrial life may not need the conditions we think at all, the forms of life are also diverse, as long as there is energy** other conditions can be changed. Just like the invisible transfer of matter that has just been completed in China (the substance is put into a machine, then decomposed into fine particles, successfully transferred to another machine 16 kilometers away, and then reduced).Energy can change everything.

The earth has only 5 billion years of life, and even if it reaches the speed of light, it can only go back and forth to 2.5 billion light years, which is walking in a straight line, and in fact it is impossible to go to another planet in a straight line. The most important thing is that I don't know where to go at all, and the position that I reached is millions or tens of billions of years ago, the sun was what it looked like 8 minutes ago, the nearest star "Proxima Centauri" was 4 years and 3 months ago, the Milky Way was 40,000 to 160,000 years before the cherry blossom was demolished, and the universe was hundreds of millions to tens of billions of years ago. Our range of activity is too small for it to reach another place where there are advanced intelligent beings.