Ceres, found in the asteroid belt between Mars and Jupiter, might not be the lifeless rock we once thought. Recent findings suggest it may have had the right conditions for simple microbial life billions of years ago. This new perspective comes from research using data from NASA’s Dawn spacecraft.
Scientists believe that if Ceres had the potential for life, that possibility faded long ago. Currently, its surface is extremely cold, and much of its water is trapped as ice, with only pockets of salty brine remaining.
The Dawn spacecraft revealed bright patches on Ceres’ surface, which turned out to be salt deposits from ancient salty water. Additionally, organic molecules found in its soil indicate that Ceres once had the necessary building blocks for life. However, researchers previously lacked evidence of an energy source needed to sustain life.
A recent study fills this gap, showing that radioactive decay in Ceres’ core could have produced enough heat for hydrothermal activity around 2.5 to 4 billion years ago. This process might have allowed warm, mineral-rich water to flow, providing essential nutrients for microbes, similar to the thriving ecosystems found near hydrothermal vents on Earth.
Samuel Courville, a researcher at Arizona State University, noted, “If Ceres had hydrothermal fluids, it opens up big implications for understanding its past habitability.”
Ceres is relatively small, measuring about 600 miles across—about one-third of Earth’s moon. Unlike moons like Europa and Enceladus, which benefit from tidal forces from giant planets, Ceres has no such energy boost to keep it warm.
Even without life, Ceres’ history may expand our ideas of where life could survive in the universe. Because many celestial bodies in our solar system share similar sizes and characteristics, they may have also provided a habitat for life in their early days.
The study doesn’t just stop at Ceres. Other icy bodies in our solar system, like some moons of Uranus and Saturn, could have gone through similar changes, possibly hosting oceans that favored life long before becoming the cold, barren landscapes we see now.
For more details on this research, you can check the study published in the journal Science Advances.
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