Nationalist, on 04 May 2012 - 03:59 PM, said:
It's extremely unlikely that they are NOT here.
Think about the numbers. According to Keppler data from NASA
there could be two billion Earth-like planets inn our galaxy alone.
A playing with mathematical equations. No amount of statistical guesswork can arrive at an estimation for the number of alien beings that are out there.
How many of those worlds would be inhabited? And by intelligent life? And for how long?
How many of those intelligences developed at the same time we did. As Carl Sagan pointed out, if the history of the universe were compressed into one day
, our species only arrived at 10:30 p.m on December 31st.
In such a calendar, the Renaissance and everything since occurred at one second to midnight on December 31st.
Human civilization has only been around for the merest blink of an eye and could easily wipe itself out over the next few hundred years. Other intelligences may be equally as foolish.
How easy would it be for civilizations on different planets to rise and fall, billions of years apart.
Also, species located on the other side of the galaxy would face a journey of 100,000 light years. The light we see from those stars began on its journey at the same time that the modern form of Homo sapiens first appeared.