
ALT The leading theory of how life began just hit a snag. It has some researchers taking a second look at other hypotheses that have been proposed — and mostly discarded — in the past. By Dirk Schulze-Makuch & Tony Reichhardt

ALT For the past decade or so, the prevailing theory has been that the first primitive organisms originated at deep-ocean hydrothermal vents. But a new paper argues that the required synthesis reactions would not occur at these vents, because: the environment would only be alkaline after it cooled, and reduced sulfur would likely be sparse in ancient ocean vents.

ALT “There wouldn’t have been enough time for the chemical reactions necessary to create life to occur before the biological building blocks fell apart again.” Dirk Schulze-Makuch & Tony Reichhardt

ALT The new paper doesn’t rule out the hydrothermal vent theory, but it shows that it may have serious problems. And it has some researchers taking a second look at some other hypotheses. Most alternative theories, like Darwin’s “little warm pond” theory, which has life arising in surface hydrothermal pools, assume that the life we see all around us originated on Earth. But what if it didn’t?






















