Poring through volumes of data taken over the course of four years when the Insight Lander touched down on the surface of the arid Red Planet back in 2018 shows on further analysis of the seismic survey that there are reservoirs of liquid water deep within the rocky outer crust of Mars. 
Studying the little quakes measured by the probe reveals the signature of significant pockets as it passes through various strata. Whilst there is ice at the poles and evidence of vapour in the thin atmosphere, none in liquid form had heretofore been detected outside of Earth, which too has vast subterranean aquifers. Buried some ten kilometres deep, researchers can extrapolate from Insight’s readings, which were limited to the depths directly beneath it, that there is potential enough water to form a surface ocean extending almost a kilometre down. This discovery also may hint at possible life on Mars subsurface.
synchronoptica
one year ago: La Linea (with synchronoptica)
seven years ago: a chapel of the Seven Sleepers, Male Fantasies plus never-before-seen photographs of David Bowie
ten years ago: Marie Curie goes to war
eleven years ago: insightful maps plus the etymology of drug names
twelve years ago: a look back at Peenemรผnde plus a lily in a glass
