"Did Life First Appear on Alien Worlds 12-13 Billion Years Ago?"

"Did Life First Appear on Alien Worlds 12-13 Billion Years Ago?" --Ask Leading Astrobiologists: "The abundance of heavy elements in the Universe has grown over history. In the past the average metallicity would be quite a bit less. Again, under the previous paradigm this had been assumed to preclude rocky planet formation early in the Universe, but now we know that such planets could have been constructed in environments that contained much poorer levels of heavy elements."