which always makes me wonder why people seem so sure there are more advanced civilizations out there than humans...<quoted text>
First, the sun and earth formed at essentially the same time and from the same cloud of gas and dust. The sun was the center of the condensation and the planets were formed from the material moving around it.
Second, there were at least two whole generations of stars before the sun and earth formed. All of the elements farther than lithium in the periodic table were formed from processes either inside of stars or from stars exploding.
if it took that long to make enough heavy elements as we have( on which a technologically advanced civilization would most likely need) then perhaps we are one of the first able to rise above the stone age?
Just a thought...