Also for most of those 14 bn years heavy elements weren't abundant enough for many rocky planets to form. It took several generations of stars and cycles of sup

Also for most of those 14 bn years heavy elements weren't abundant enough for many rocky planets to form. It took several generations of stars and cycles of supernovas to end up with the heavy element rich environment we find ourselves in. Our star's siblings might be the first generation with a rich enough planetary environment and abundance of heavy elements to support life and technological civilizations.