A fascinating seven-planet system lies about 40 light-years away, and new research suggests it could be rich in water, an essential ingredient for life. This system, known as TRAPPIST-1, was discovered in February 2017. Since then, scientists have been eager to learn if any of these planets might support life.
The key focus of current research is water availability. Studies indicate that planets around red dwarf stars, like TRAPPIST-1, might have lots of water. However, they also face challenges in retaining it due to their parent stars’ intense radiation, which can cause significant water loss to space.
A recent study led by Trent Thomas, an astrobiologist at the University of Washington, explores these findings further. Using data from the James Webb Space Telescope (JWST), researchers found that TRAPPIST-1 c, one of the planets, likely doesn’t have a thick carbon dioxide atmosphere, making it less "Venus-like" than previously thought. Yet, there’s still a possibility of water vapor or oxygen being present.
The researchers aimed to determine if volcanic activity might supply water to the atmosphere. Their modeling suggested that the outgassing rates—how much water might escape from a planet’s interior—could be between 0.03 times and eight times that of Earth. However, the planets may have low volcanic activity, similar to Mars, which is known to have hidden magma but is generally considered ‘volcanically dead’.
Interestingly, the study indicates that the TRAPPIST-1 planets could possess drier mantles, with water making up to just 1 percent of their mass. This contrasts with Earth, where water represents a small fraction of the total mass, even though it covers about 71 percent of the surface.
The TRAPPIST-1 system has drawn considerable interest. A survey from NASA in 2022 revealed that 56% of respondents found the possibility of extraterrestrial life intriguing, highlighting the public’s fascination with space exploration.
As observations with JWST continue, scientists hope to clarify the habitability of TRAPPIST-1. The ongoing research gives us a glimpse into the chances of finding water, and perhaps life, beyond our home planet.
For those interested in exploring these findings further, you can read the full study here.
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