The first answer is based on physics which is based on space/size. A human is microscopic compared to the earth which is miniature compared to the sun which is minute compared the the solar system which is miniscule compared to the billions of stars in our galaxy, which is really really small compared to billions of galaxies,and supernovas, and quasars, and space in the known 15 billion light year universe that we can “see”. So there is no meaning of life.
Entropy is supposed to kill everything but what is really bizarre Is that in any direction given to infinity there is a star So sorry that my grey neurons are greening But there just is no meaning
The second answer is based on biology which is based on time/age. Human history (10,000 years) is short compared to homo sapiens (100,000 years) which is short compared to australopithecus (4,000,000 years) which is short compared to life on earth (4,000,000,000 years). So there is no meaning of life.
Our total time here on earth is only one second to midnight on sunday Which in the words of shakespeare is otherwise known as a BFD Take out the dry cleaning There is no meaning
The third answer is based on psychology which is based on the brain/consciousness. A boy is interested in games, a young man is interested in girls, a middle aged man is interested in goods, and an old man is interested in his potential grave. So a human, depending on which stage of life they are in, makes up his/her meaning of life.
But sometimes there is a magical system that opens the portal if you're lucky Even though explanation is only about things that are mathematically yucky I am not trying to be demeaning You have to make up your own meaning
Ps: If you figure meaning out then perhaps you could move on to solutions for the origin of life, morality, and consciousness!
Pss: Here are some lines of thought from three greats.
[1] Claude Shannon, who basically separated meaning from information, concluded that meaning was novelty so a political speech has zero meaning.
[2] Wittgenstein said don’t look for meaning… look for use.
[3] Albert Camus was really critical of any meaning, instead focusing on the journey in this weird marvelous world.