When I look at the sky, especially at night, I like to think about how many similar places there are to our planet, . I also I wonder if everything is part of one living being. When I look at the sky, especially at night, I like to think about how many similar places there are to our planet. I also wonder if everything is part of one living being.

These are 2 independent clauses added together using a comma (comma splice). You would need either FANBOYS or a semicolon

When I look at the sky, especially at night, I like to think about how many similar places there are to our planet, also I wonder if everything is part of one living being. When I look at the sky, especially at night, I like to think about how many similar places there are to our planet, also I wonder if everything is part of one living being.

"When I look at the sky" is correct, but "When I look into the sky" is a more common phrase for this context (looking into outer space)

It's beautiful and mysterious at the same time because the universe is infinitye and, we still don't know himit well. It's beautiful and mysterious at the same time because the universe is infinite and we still don't know it well.

Its= possessive It's = It is Universe is not male (no gender/object = it)

It's beautiful and mysterious at the same time because the universe is infinitye and, we still don't know himit well. It's beautiful and mysterious at the same time because the universe is infinite and we still don't know it well.

"still don't understand it well" is a more common phrase than "still don't know it well."

sSometimes we are arrogant and w. We believe the best in technology and we fight amongst ourselves, believing ourselves to bwe are superior, instead of uniting to protect our planet and discover the universe. Sometimes we are arrogant. We believe the best in technology and we fight amongst ourselves, believing we are superior, instead of uniting to protect our planet and discover the universe.

This is a very long list so you should break it up into multiple sentences.

sSometimes we are arrogant and we believe in the best in technology and we fight amongst ourselves, believing ourselves to be superior, instead of uniting to protect our planet and discover the universe. Sometimes we are arrogant and we believe in the best technology and we fight amongst ourselves, believing ourselves to be superior, instead of uniting to protect our planet and discover the universe.

But I believe that there are dark forces preventing us from moving forward. But I believe that there are dark forces preventing us from moving forward.