Lava tubes are hollow tunnels left behind when the outer crust of a lava flow solidifies while molten rock keeps draining through the interior. Long after an eruption, residual heat conducted from a cooling magma body near one end can still raise wall temperatures for hundreds of meters, decaying with distance. A research drone equipped with thermal sensors can map this gradient as it drives the tube's length.
T(x) = T_ambient + ΔT_magma · exp(−x / L)
L = characteristic decay length (∝ conductivity, ∝ 1/proximity)
airflow moderates convective heat loss along the tube
- Probe position — drives the drone along the tube from the entrance (cool, ambient) toward the magma-proximal end (hot).
- Magma proximity — scales how much residual heat is still being conducted into the tube walls near the far end.
- Tube airflow — natural convection currents that carry heat away and flatten the temperature gradient when strong.
- Temp overlay toggle — colors the tube wall by measured temperature instead of natural basalt rock color.
Planetary scientists study terrestrial lava tubes like this as analogs for potential lunar and Martian lava tubes, which could one day shelter habitats from radiation and temperature extremes.