Theory of Liquid Water on Venus's Surface Challenged by New Research

Two main theories exist regarding the environmental evolution of Venus since its formation 4.6 billion years ago. One suggests that Venus's surface temperature once allowed for the existence of liquid water but later extreme greenhouse effects triggered by extensive volcanic activity turned Venus into an inferno. The other theory posits that Venus has been too hot since its inception, never experiencing liquid water.

Researchers from the University of Cambridge in the UK have calculated the destruction rates of water, carbon dioxide, and carbonyl sulfide molecules in Venus's atmosphere, which need to be replenished through volcanic gas emissions to maintain atmospheric stability. Volcanic activity offers crucial clues to understanding the internal structure of Venus and other rocky planets. As magma rises from Venus's mantle to the surface, gases are released into the atmosphere. On Earth, volcanic emissions are primarily water vapor due to the planet's water-rich interior. However, the study reveals that the water content in Venus's volcanic gases is at most only 6%, a key detail for sustaining its atmosphere.

Published in the journal "Nature Astronomy," these findings hold significant implications for understanding Earth's uniqueness and searching for life-sustaining planets beyond our solar system. Despite the similarities between many exoplanets and Venus, this research underscores the importance of astronomers focusing on exoplanets more akin to Earth.