Phosphorus in Enceladus’s ‘Soda Ocean’ Adds to Prospects for Life
Enceladus — the sixth-largest of Saturn’s 146 moons — has a liquid ocean with a rocky floor under its bright, white and frosty surface. Ice volcanoes spew frozen grains of material into space, generating one of the many rings circling the planet.
Now, a team of researchers has discovered that those icy grains contain phosphates. They found them using data from Cassini, a joint NASA-European orbiter that concluded its study of Saturn, its rings and moons in 2017. It is the first time phosphorus has been found in an ocean beyond Earth. The results, which add to the prospect that Enceladus is home to extraterrestrial life, were published on Wednesday in the journal Nature.
“We weren’t expecting this. We didn’t look for it,” said Frank Postberg, a planetary scientist at the Free University of Berlin who led the study. He described the realization that they had found phosphates (chemicals containing the element phosphorus) as a “tantalizing moment.”
With the discovery of phosphorus on the ocean world, scientists say they have now found all of the elements there that are essential to life as we know it. Phosphorus is a key ingredient in human bones and teeth, and scientists say it is the rarest bio-essential ingredient in the cosmos. Planetary researchers had previously detected the other five key elements on Enceladus: carbon, hydrogen, nitrogen, oxygen and sulfur (the last of which has been tentatively detected).
Source: The New York Times
