2000px-Panspermie.svgWhere did life start and how did it start.These are have always been the burning question of science.many researchers proposed theories about the approach of ilfe to earth.But no one can actually show direct evidence to them.Let’s look at some of the most famous theory named penspermia.
This theory suggests that life originated elsewhere in the universe and later approached to earth hundreds of millions of years ago.Now we don’t have direct evidence like picture or videos to prove it.But recent discoveries have  put up some facts as strong evidence for this claim.In 1998 a rock was discovered in Antarctica containing microbial life in fossilized form.Some claimed it was contaminated here on earth but it may not have been.So we may have got the evidence that life could exist elsewhere in universe so it could be possible for them to approach earth as well.Earth is always being bombarded by asteroids and other space debris from far away.They could contain life even today.It could have happened millions of years ago and started the cradle of life which we are on today.Still there is no direct evidence to prove this but with some strong facts and further research lets see if it proves it’s claims.


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cells23.8 billion
Scientists believe this is the number of years ago when cell first originated on Earth.They were prokaryotes.A organism which is single celled but they have nucleus unpresent and also organelleswere unpresent. Bacteria are an example of prokaryotes.
0.001 to 0.003
This is the diametrical number of most animal cells in centimeters.As a result they are invisible to the naked eye.
200
This is the number of types of cells in our body starting from skin, nerves, muscles, blood, intestines, and bones.
120
120 days is the approximate lifespan of human red blood cell. Different cell types have unique lifespans, starting from a few weeks to much more.
50 to 70 billion
Approximately 50-70 billion cells die in our body.But this is part of our normal internal workings of a human body.Always cells are dying in our body and being regenerated at the same time.It’s a continuous non stop process whether we are awakes or not.


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