The real face of life on alien worlds is far stranger than fiction. There’s an exotic zoo of planets out there many of them aren’t anything like the kind of planets we find in our own solar system. Space telescopes have spotted thousands of potential planets for extraterrestrials to call home. Using this data, we are zooming in to determine what the alien inhabitants might look like.
But how can we know what’s swimming around on a world 3,000 trillion miles away? The answer is evolution. By comparing conditions here on Earth with the environment of the alien planet, we can theorize how life there may have evolved:
So, the propulsion mechanisms that are adapted and evolved by alien fish would be pretty similar to the propulsion mechanisms that you find on Earth simply because they’re solving the same survival situation with the means that are available to them.