Scientists have identified a huge underground lava tube beneath the surface of Venus, marking the first direct observation of such a geological feature on the planet. This breakthrough discovery, made through a new analysis of radar data from NASA’s Magellan mission in the early 1990s, provides valuable insight into the planet’s volcanic history and subsurface processes.
The research team, led by experts from the University of Trento, used advanced imaging techniques to re-examine data from Magellan’s Synthetic Aperture Radar. This technology allowed them to see through Venus’s thick cloud cover, which blocks conventional cameras, and look for signs of underground cavities. They found evidence of a large cavity interpreted as a lava tube beneath the region of Nyx Mons, a vast shield volcano located in the planet’s northern hemisphere.
According to the study, the discovered cavity has an estimated diameter of about one kilometer and a roof thickness of at least 150 meters. The empty space below reaches a depth of at least 375 meters. These measurements indicate that the Venusian lava tube is both wider and taller than similar structures found on Earth, the Moon, or Mars. The initial section was directly observed, but researchers believe the tube could extend for several miles, supported by the presence of multiple surface pits in the region.
Lava tubes are natural tunnels formed when low-viscosity lava flows beneath a solid crust, leaving behind large underground voids after the eruptions stop. While lava tubes are well documented on Earth and suspected or identified on the Moon and Mars, this is the first time such a feature has been observed directly beneath Venus’s surface.
The physical and atmospheric conditions on Venus — including its lower gravity and thicker atmosphere — could promote the formation of larger lava tubes compared to other planets. These conditions help create an insulating crust around flowing lava, resulting in wider and taller tunnels. Scientists hope that future missions, such as the European Space Agency’s Envision and NASA’s Veritas, will use higher-resolution radar and ground-penetrating instruments to map these subsurface features in even greater detail. Such advances could reveal more about volcanic activity on Venus, including the possible existence of currently active volcanoes.
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