About Life on Other Planets

Is there life on other planets besides Earth? As far as scientists have observed, so far there has been no evidence of life in a universe other than Earth. But what are the chances?

In our solar system there are 8 planets. Only the earth is inhabited by living things. Why? Because only the earth is friendly to live in. Other planets are too close or too far from their parent star (the sun).

If it's too close, it's too hot. Too far means too cold. Not only that. There are so many other factors that make the earth so special.

Other planets don't have that feature, making it unlikely to be home to living things.

Mars, which is closest to Earth, is actually very similar and meets many of the conditions to be habitable. However, this is not the case.

There are a number of conditions that Mars does not fulfill. The conditions for living things to live in were extremely complicated.

But are there other planets inhabited by living beings? Again, we haven't found any evidence.

But when it comes to possibilities, it's very open. To date scientists have discovered more than 4000 planets in the Milky Way, in various sizes. There are about 100 that are the size of the earth. But then again, there are many other conditions that must be met for a planet to be habitable.

If there was a planet identical to Earth, would there be life on it? We don't even know that yet.

Optimistically we can say, it should. After all, this planet simply follows natural laws, and goes through the same history as earth. The problem is, the natural laws that cause living things to form are not yet known to humans.

Humans do not yet know the process of changing from inanimate molecules into living things. So, it's hard to conclude the next question.

What would happen if there was a planet that looked exactly like Earth?

The possibilities are many. It is possible that the living things there are not of the same kind as those on earth. The process of evolution is very complicated, so the possibility of identical evolution with the evolution on earth is also very small.

The possibility of intelligent beings like humans is also very small. But with a very small possibility, the opportunity remains open.

There are hundreds of billions of stars in the Milky Way alone. Number of planets? I don't know how many trillion. If the chance of the existence of a planet like Earth is only 0.0000000000001, multiplied by hundreds of trillions, the result may not be zero.

Another problem is distance. The diameter of the Milky Way is roughly hundreds of thousands of light years. If there were a planet like Earth, it would be thousands of light years from Earth. This means that if we send a signal now, it will only span thousands of years.

Although the history of human civilization itself is only about 10 thousand years old.

If there were a civilization like ours on a planet in Andromeda, if we radioed in now, it would take another 2.5 million years to get there. At that time the civilization there might have been extinct.

On the other hand, the signals of civilization we may receive date back to civilizations 2.5 million years ago. Signals sent 1 million years later would be impossible for us to receive.

In short, it is highly unlikely that we will find evidence of other life on other planets.