Origin of Life on Earth

How did life originate on Earth?

Let’s define life first. Anything that has life has molecular movement within them. The only exception being virus. This is the most basic definition of a living thing. Obviously, they might do a host of other stuff too. But one thing remains  certain, the building blocks of life on earth are Amino Acids. Amino acids are the smallest divisions of proteins, consisting of NH2 and COOH groups. Initially, earth was a very hostile place. Life as we know today would have no chance of existing in those conditions. So what paved way for life?

There are various theories regarding the origin of life. I’d like to discuss two of them here.

Charles Darwin’s theory of evolution:

Darwin’s theory was simple. Initially, life originated by spontaneous generation which means that Organic life was created out of inorganic substances. The development of life after this could be explained by evolution. Thus complex organic life began from the simple inorganic substances.

The initial inorganic to organic conversion has been proven to be true, up to a certain extent by the Miller-Urey experiment. What Miller and Urey did was that they simulated the early conditions of earth in a science laboratory. The early atmosphere largely consisted of Ammonia, methane and hydrogen. Miller sparked the mixture with electricity and supplied light. After a couple of weeks, he found organic substances i.e amino acids. Further experiments have confirmed that all the 20 amino acids found in organisms can be formed by replicating infant earth. 

I had said that experiments proved Darwin’s words up to only a CERTAIN extent because these experiments have failed to show LIFE originating from inorganic substances( Spontaneous generation). They have merely shown that organic substances can emerge from inorganic substances, provided the conditions are right. The only argument we can give about this failure is that we do not have enough knowledge about Earth’s conditions after the formation of amino acids.

So, according tho this theory, life originated by accident. It would’ve taken millions of years for amino acids to assemble the exact way to support life. It all boils down to probability.

Panspermia Theory:

Another theory is that life did not originate in earth. Instead, it came from outer space via an asteroid. Simple life forms like bacteria might have been embedded within the asteroid surface , frozen and protected by the vacuum of pace. On collision with earth, the frozen bacteria would have touched land and replicated. After that, evolution followed.

If this is the case, then life must be all around space. The asteroid belt must be teeming with frozen bacteria. We can surely test this by sending a probe to an asteroid. Maybe asteroids are Adam and Eve. 

Write articles or submit your media to earn money at this site.

5
Liked it
6 Responses to “Origin of Life on Earth”
  1. The SMS Man Says...

    On July 9, 2010 at 2:26 pm

    Panspermia theory is used in The Hitchhiker’s Guide to the Galaxy! :P


  2. ceegirl Says...

    On July 9, 2010 at 2:42 pm

    Didn’t know this, thanks for sharing.


  3. giftarist Says...

    On July 9, 2010 at 6:28 pm

    Interesting thoughts here, friend. Good work!


  4. briantaylor1992 Says...

    On July 9, 2010 at 7:45 pm

    In evolution, they believe life happened through the “primordial soup” theory that amino acids were all over, and they just happen to ran into each other enough times until the right combination formed what we call a living strand of micro organism. Then over billions of years, as scientists recently stated that they found creatures alive as far back as 2.2 billion years ago, things evolved. That’s the theory.

    The other one doesn’t really make sense to me. An asteroid colliding with Earth would cause mass destruction. The last time an asteroid hit the Earth, the entire asteroid was completely vaporized/destroyed. Nothing on impact survived, so I really don’t seem how if no live could survive at point of impact in any other asteroid, then how would microscopic life on an asteroid survive? Both ways rely on evolution to keep the steps going. I personally find the latter of the two to be extremely hard to believe. The first does seem to hold more ground to it, but then again, it is all theory, as we will never know the real answer without a shadow of a doubt. Nice article once again.


  5. Leonardo da Vinci E. Says...

    On July 17, 2010 at 1:14 pm

    I appreciate your creativity, research and choice of topic here.


  6. yerrr Says...

    On August 18, 2010 at 10:06 pm

    briantaylor1992 – i agree LOL funny


Post Comment
comments powered by Disqus