What are other planets for?
Yeah🙋🏽‍♂️ I was wondering today why other planets exist? And whether there are any animals, plants, or living creatures on other planets?
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The number of planets depends primarily on how much mass was present in the form of gas and dust when a star system formed, and whether the gravity was sufficient to form planets alongside the star. In our solar system, there was enough mass to form the planets we know, as well as the many dwarf planets. In the very young solar system, however, there were many more planets than there are today. However, their mutual gravitational forces and unstable orbits essentially kicked each other into space; some may have crashed into the sun, and others may have collided with each other. Earth and the other planets have also experienced such collisions. Ultimately, eight planets remained, and their orbits stabilized over time. Apart from Earth, there is no other planet in our solar system with life in the form of animals and plants. There may be life in the form of simple microbes deep beneath the surface of Mars, but that is purely speculative. Far better candidates are icy moons like Enceladus or Jupiter's moon Europa. Their interiors are warm enough for liquid water to exist beneath the ice sheet as an ocean, and microbial life is more likely to exist there.
Masses have gravity.
Gravity has an attractive effect. This explains why planets exist.
Planets exist because they contracted due to gravity. Very large gas planets become stars.
Another one of those anthropocentric questions that assumes that nature arranges everything purposefully for the benefit of humans. This assumption is incorrect. There is no concept of purpose in nature – everything exists because it functions together.
The question "why" is pretty meaningless unless one assumes a planned "creation".
Gravitational forces formed several bodies from the cloud of gas and dust. The fusion reaction eventually ignited in the largest, but the others were too small. Had Jupiter been a bit more massive, it would have been a candidate for a second sun in the solar system.
On one of these bodies—as a result of a chain of many coincidences—life has developed. Even life forms that can now question the purpose of the other planets.
But since there are billions of galaxies, each with billions of star systems, there are likely to be some planets out there that also orbit a relatively long-lived and stable central star in a habitable zone. Some form of life has certainly evolved in other parts of the universe as well.
How can I learn about the galaxy?
Our planetary system can be compared to a clockwork. It's a very finely balanced system. Each planet is like a cog. If even one planet in the solar system were to be removed, the consequences would be disastrous.
The solar system is a miracle in itself.
LA
Why? There's no reason. There are reasons why something exists (gravity, etc.), but not "why." For that to happen, there would have to be a will to exist, and there's no evidence for that.
Is there life on other planets? We haven't found any yet.
What's the point? Seriously? There's no "use"; they just exist. We have no use to the universe either. We simply exist.