---
title: "Saturn’s Soda Ocean and a Record-Hot Amoeba: A Week of Research on Life’s Outer Edges"
description: "New studies of Enceladus’s geysers, a red-dwarf planet in permanent reverse and a global food web"
author: "Walter Pine"
published: 2026-09-26T21:59:39Z
modified: 2026-09-27T05:07:59Z
url: https://rews.cc/a/saturn-s-soda-ocean-and-a-record-hot-amoeba-a-week-of-resear-6f885f
language: en
tags: ["enceladus", "space", "biology", "exoplanets", "astrobiology", "science"]
publisher: "Rews (https://rews.cc)"
---

# Saturn’s Soda Ocean and a Record-Hot Amoeba: A Week of Research on Life’s Outer Edges

*New studies of Enceladus’s geysers, a red-dwarf planet in permanent reverse and a global food web*

By Walter Pine · September 26, 2026 · https://rews.cc/a/saturn-s-soda-ocean-and-a-record-hot-amoeba-a-week-of-resear-6f885f

## In brief

- An amoeba found in above-64°C water at Lassen sets a new heat record for complex eukaryotic life
- An Earth vent microbe thrived in a lab simulation of Enceladus’s alkaline subsurface “soda ocean”
- Reanalysis of Cassini ice grains shows nature pre-sorts organic compounds, easing biosignature detection
- Astronomers report GJ 3090 b, the first retrograde planet found around a red dwarf, 60 light-years away
- The citizen-science database Who Eats Whom has logged some 14,000 predator-prey observations

One hundred and forty-seven degrees Fahrenheit. In Hot Springs Creek, in Lassen Volcanic National Park in California, the water runs hotter than that — past 64 degrees Celsius — and it was there, in water that would inflict third-degree burns on a human being within seconds, that researchers found an amoeba quietly going about its business. For scale, the average hot tub runs about 100°F.

The amoeba, described in the journal Cell and flagged this week in 404 Media’s newsletter the Abstract, is new to science: *Incendiamoeba cascadensis*. Simple prokaryotic organisms survive far worse — the microbe *Methanopyrus kandleri* tops out near 252°F — but the heat ceiling for the more complex, eukaryotic kind of cell was thought to be 60°C (140°F). “Incendiamoeba cascadensis proliferates at temperatures beyond what was thought possible for any eukaryote,” write the researchers, led by Beryl Rappaport of Syracuse University. “This discovery raises questions about the true maximum temperature a eukaryotic cell can endure.”

## The moon that does the lab work

The week’s most consequential biology, though, happened nowhere on Earth. Enceladus, a moon of Saturn barely 300 miles in diameter, keeps a subsurface ocean beneath its ice shell and hydrothermal vents on its seafloor — on Earth, hotspots of life. Geysers fling that ocean into space, where the Cassini spacecraft flew through the plumes repeatedly; the craft [reached Saturn in 2004](https://earthsky.org/space/end-of-mission-cassini-saturn-sept-15-2017/) and worked until its mission-ending plunge in 2017, giving humanity its first taste of an extraterrestrial sea. What Cassini lacked was any instrument designed to detect biosignatures, the chemical fingerprints of life.

Two new studies in *Science Advances* argue the hunt would be easier than assumed. In the first, researchers built a laboratory imitation of Enceladus’s “soda ocean” — alkaline, rich in carbonate — and installed in it *Methanothermococcus okinawensis*, a heat-loving microbe that lives on deep-sea hydrothermal vents here on Earth. It fared even better than expected, a result that potentially widens “the habitability window of Enceladus’ subsurface soda ocean,” according to the team led by Vanessa Helmbrecht of Ludwig-Maximilians-Universität München.

In the second study, researchers revisited Cassini’s observations of the ice grains sprayed into space and found that the ocean droplets freeze slowly, causing organic molecules to separate into concentrations of similar compounds. Biosignatures, if present, would arrive conveniently pre-sorted for any instrument that caught them.

> In the plume grains, each separated compound can then be found at strongly elevated concentrations in a relatively small fraction of ice grains. This is good news for future plume sampling missions investigating Enceladus’ promising habitability provided that they can sample and analyze ice grains individually.

So conclude researchers co-led by Frank Postberg and Zenghui Zou of Freie Universität Berlin. Missions that could do the sampling — NASA’s Enceladus Life Finder, the European Space Agency’s L4 mission — have been floated for years without a formal green light; 404 Media’s assessment is that Enceladus is, astrobiologically speaking, low-hanging fruit, a case [examined at length in a companion account](https://rews.cc/a/enceladus-does-the-lab-work-saturn-s-geysers-may-make-alien--64c61c).

## Retrograde for real, and who eats whom

Elsewhere in the week, astronomers described a world against the tide. GJ 3090 b, about 4.5 times as massive as Earth and 60 light-years away, is the first planet found on a retrograde orbit around an M dwarf, the small class of star better known as a red dwarf. In our solar system “retrograde” is an optical illusion; this planet genuinely circles against the direction of its star’s rotation. Since no massive companion appears to have knocked it into reverse, the researchers — led by Yann Carteret of the University of Geneva, writing in *Astronomy & Astrophysics* — argue that “the architecture of the GJ 3090 system instead favors a primordial misalignment of the protoplanetary disk.”

And back on Earth, where every living thing must eat, a new online database called Who Eats Whom is enlisting the public in charting the tangle. In partnership with the platform iNaturalist, it has catalogued some 14,000 observations of food-web interactions from nearly 2,000 observers in more than 100 countries, according to the progress report in *PLOS Biology*. It is, to the knowledge of the researchers — led by Bradley C. Allf of Colorado State University — “the first attempt to create a global food web derived specifically from verifiable citizen science photographs,” and it is designed, beyond the science, “as a tool for education and public engagement.”

The particulars reward browsing. Searching the red fox turns up a bold Australian python-eater and a photograph, from Ontario, of an Eastern chipmunk’s final moments, captioned “not a great day.” Coyotes, it emerges, supplement the chase with persimmon binges that leave seed-filled scat behind. An interactive map assembles the whole web.

The newsletter’s name for that web is the prandial ouroboros: we are what we eat, and what we eat eats, and so on. As for the record-breaking amoeba at 64 degrees, the advice is to let it have its win and leave the deadly hot springs to it. Counsel worth taking at 147°F.