Why do we even exist on EARTH ?

Posted: July 26, 2015 in evolution of life, real fiction, theory
Tags: , , , , , , , , , , , , , ,

Sometimes the question arises in the mind that why do we even exist in the world ?

How can life form only on earth ?

When did the life began on earth ?

Do we belong here ?

Similar questions arises & we are unable to quest our thirst so moves on. But now on ask me anything & i’ll give  you the answers.

Life on Earth began more than 3 billion years ago, evolving from the most basic of microbes into a dazzling array of complexity over time. But how did the first organisms on the only known home to life in the universe develop from the primordial soup? There are several theories about evolution of life lets read them first.

  1. Electric sparks can generate amino acids and sugars from an atmosphere loaded with water, methane, ammonia and hydrogen, as was shown in the famous Miller-Urey experiment reported in 1953, suggesting that lightning might have helped create the key building blocks of life on Earth in its early days. Over millions of years, larger and more complex molecules could form. Although research since then has revealed the early atmosphere of Earth was actually hydrogen-poor, scientists have suggested that volcanic clouds in the early atmosphere might have held methane, ammonia and hydrogen and been filled with lightning as well.
  2. The first molecules of life might have met on clay, according to an idea elaborated by organic chemist Alexander Graham Cairns-Smith at the University of Glasgow in Scotland. These surfaces might not only have concentrated these organic compounds together, but also helped organize them into patterns much like our genes do now.
  3. The main role of DNA is to store information on how other molecules should be arranged. Genetic sequences in DNA are essentially instructions on how amino acids should be arranged in proteins. Cairns-Smith suggests that mineral crystals in clay could have arranged organic molecules into organized patterns. After a while, organic molecules took over this job and organized themselves.
  4. The deep-sea vent theory suggests that life may have begun at submarine hydrothermal vents, spewing key hydrogen-rich molecules. Their rocky nooks could then have concentrated these molecules together and provided mineral catalysts for critical reactions. Even now, these vents, rich in chemical and thermal energy, sustain vibrant ecosystems.
  5. Ice might have covered the oceans 3 billion years ago, as the sun was about a third less luminous than it is now. This layer of ice, possibly hundreds of feet thick, might have protected fragile organic compounds in the water below from ultraviolet light and destruction from cosmic impacts. The cold might have also helped these molecules to survive longer, allowing key reactions to happen
  6. Nowadays DNA needs proteins in order to form, and proteins require DNA to form, so how could these have formed without each other? The answer may be RNA, which can store information like DNA, serve as an enzyme like proteins, and help create both DNA and proteins. Later DNA and proteins succeeded this “RNA world,” because they are more efficient. RNA still exists and performs several functions in organisms, including acting as an on-off switch for some genes. The question still remains how RNA got here in the first place. And while some scientists think the molecule could have spontaneously arisen on Earth, others say that was very unlikely to have happened.
    Other nucleic acids other than RNA have been suggested as well, such as the more esoteric PNA or TNA.
  7. Instead of developing from complex molecules such as RNA, life might have begun with smaller molecules interacting with each other in cycles of reactions. These might have been contained in simple capsules akin to cell membranes, and over time more complex molecules that performed these reactions better than the smaller ones could have evolved, scenarios dubbed “metabolism-first” models, as opposed to the “gene-first” model of the “RNA world” hypothesis.
  8. The theory on which i believe the most says : Perhaps life did not begin on Earth at all, but was brought here from elsewhere in space, a notion known as panspermia. For instance, rocks regularly get blasted off Mars by cosmic impacts, and a number of Martian meteorites have been found on Earth that some researchers have controversially suggested brought microbes over here, potentially making us all Martians originally. Other scientists have even suggested that life might have hitchhiked on comets from other star systems. However, even if this concept were true, the question of how life began on Earth would then only change to how life began elsewhere in space.

So here ends my first article so what do you think? Which theory do you believe in? Tell me & ask anything.

  1. omega says:

    Maybe we are on a ship in hibernation being tended to by our benevolent AIs that are taking us to our new home…Earth. That’s what Google’s Deep Mind guessed anyway 😉 I do believe our view of reality is skewed and easily manipulated, which does not mean to discard your Mind, but look around and through it. Until we can learn to live in peace in the simulation, we don’t get to stretch our legs.

    With all these things, no one knows or can tell you, no, not even one. Until you close your eyes and let go, how can you know. Can you practice letting go in life and peeking around the corner? I think yes based on my experiences. You seem to have an answer in front of you, it lies within after all. It’s perfection actually. I tripped onto the idea or reality that the future is creating the still point of the present interacting with the past. All for us to do is be quiet and listen. We have to master the ego program. My two cents and along with everyone else’s will buy you nothing. If I was going to counsel someone on how to live and what to do with all the craziness around us, I would simply say, Be Love. You can go the other way, but if you want the light in your life, it will cost you your life and ultimately everything you think you are. I have embraced this personally and have come to the end of knowing. Peace and much love on your journey.

    Liked by 1 person

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