Titan Sustains 1.6 Million Square Kilometres of Methane Lakes at Minus 179C
Updated
Updated · spacedaily.com · Jul 25
Titan Sustains 1.6 Million Square Kilometres of Methane Lakes at Minus 179C
3 articles · Updated · spacedaily.com · Jul 25
Summary
Cassini mapped more than 1.6 million square kilometres of Titan lakes and seas, showing Saturn’s largest moon has a working surface liquid cycle even though its visible rivers and lakes are not water.
At about minus 179C and 9.5 AU from the Sun, water on Titan is frozen into crust and bedrock while methane and ethane can condense, rain, flow through channels and pool in polar basins.
Huygens reinforced that picture in 2005 by imaging branching channels, flood-plain-like terrain and rounded water-ice pebbles, with heat from the probe causing methane to boil from damp surface material.
Cassini later detected radar-dark seas, sunlight glinting off a northern sea and some small northern lakes more than 100 metres deep; the north holds most major surface liquids while equatorial regions are dominated by dry dunes.
The methane cycle still poses a supply puzzle because sunlight steadily destroys atmospheric methane, leaving scientists to debate how Titan replenishes it as NASA targets a Dragonfly launch no earlier than July 2028.