posted on Sep, 30 2012 @ 05:21 AM
There is nothing special about DNA. All the chemicals needed to create it are abundant in our solar system and no doubt throughout the universe. But
that doesn't mean life is rife through the universe. DNA is one step, one step in a LONG LONG line of evolution which requires favourable
circumstances for which to progress....or the ability to evolve and adapt, which isn't always possible, more species die daily due to the inability
to adapt, than there are new species than learn to cope and progress.
As much as many won't agree, the Earth is special, if you want to use that word, in a sense that it has just enough gravity to allow things to come
together and stick to the surface (i.e. we can walk, but we can also counter gravity and leap with little issue) But also not to little so as to make
it hard for things to come together
And that's just one piece of the equation...
The conditions on earth are favourable for the bonding of chemicals/biological organisms, it's abundance of water, clear enough atmosphere to allow
the suns light to penetrate but not so much that it would boil away the water and strip the atmosphere. It's magnetic fields which protect us
daily....the list goes on.
This isn't the story for all planets in our solar system and is surely the same throughout the universe.
Some planets in our galaxy alone may well have had the starts of life forming, then a big ass comet could have come and wiped it out. The variables
are to many to make any real assumptions and even things like the Drake Equation are merely part of a guessing game. The truth is, we WONT know if
life exists anywhere else until WE find it and even then, it will more than likely be something less spectacular than most on this board would happy