If you’re after thrilling waves beyond our planet, look no further than Titan, Saturn’s largest moon. On this icy world, even a gentle breeze could whip up waves reaching heights of 10 feet (3 meters), a spectacle unlike anything on Earth.
A new research model called “PlanetWaves” helps scientists understand how waves behave in alien liquids. Traditional models focused mainly on planetary gravity. But PlanetWaves adds other key factors, like atmospheric pressure and the properties of the liquid, including its density and viscosity, which influence how ripples form.
Lead researcher Una Schneck, a Ph.D. student at MIT, explains how this model improves upon earlier methods, allowing a deeper exploration of wave dynamics on various celestial bodies.
The team based their findings on data gathered over 20 years from buoy measurements on Lake Superior—Earth’s largest freshwater lake. The model matched these real-life measurements perfectly, which gave the researchers confidence to apply their approach to Titan.
As Andrew Ashton from MIT emphasizes, our expectations about waves on Earth might not apply to other worlds. Titan is particularly intriguing because it possesses lakes and rivers filled with liquid hydrocarbons like methane and ethane, not water. The temperatures there plunge to a bone-chilling -179 degrees Celsius (-290 degrees Fahrenheit).
MIT’s Taylor Perron notes the excitement surrounding Titan’s lakes; researchers haven’t seen them directly, yet the PlanetWaves model offers insights into possible wave behavior. The light winds on Titan could create waves much taller than what might be expected, moving slowly but majestically on the surface.
As waves continually batter shorelines, they contribute to erosion. On Titan, scientists are curious if these waves might help explain the strange absence of traditional deltas seen on Earth. Might they have altered Titan’s shorelines?
Understanding wave sizes will be vital for any future missions aiming to explore Titan’s lakes. If a probe is ever sent, it must be designed to withstand the potential wave energy.
The team also applied their model beyond Titan. Mars, for example, was once home to liquid water, but as its atmosphere thinned, it became harder for winds to create waves. Exploring such historical changes reveals how liquid worlds evolve over time.
Looking farther out, planets in the habitable zone, like LHS 1140b, hint at the possibility of liquid water, although it’s still unconfirmed. This super-Earth could have waves affected by its stronger gravity, while the lava-covered exoplanet 55 Cancri e would require extreme winds to create any ripples due to the thickness of its lava oceans.
Their findings were detailed in the Journal of Geophysical Research: Planets, published on April 3, 2023. This research not only enhances our understanding of wave dynamics across the solar system but also enriches our appreciation of the varied environments that exist beyond Earth.
