Are there rivers and lakes on other worlds?
The answer, surprisingly, is yes!
Titan, which is the largest moon of Saturn, has lakes and rivers on its surface. Unlike Earth, the rivers and lakes and streams on Titan are made out of methane and ethane. But very much like Earth, there’s what we call a hydrologic cycle. So methane can move back and forth between the surface and the atmosphere.
That means that we don’t just have lakes and streams and rivers. We also have rain and clouds. And Titan is one of the only places in the solar system where it might be possible to see a rainbow.
At other points in solar system history, we do think that other worlds also had lakes and streams. Mars, for example, we know, had a lot of liquid water on its surface earlier in its history.
But today there’s only two places in our solar system that currently have liquid on their surface — Earth and Titan.
So, are there rivers and lakes on other worlds? In our solar system, the answer is definitely yes, but we also know that there’s more to be discovered as we start to learn more about planets around other stars. Learn more.
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