Just because it's possible for something like this to have also occurred on Mars doesn't guarantee the presence of liquid water.
. That signal, a strange bright reflection, came from the Martian south pole in a region known as Ultima Scopuli. Researchers investigating the reflection now suggest that the signal didn't come from the ice itself, or even from liquid water, but from underlying geological layers made of minerals and frozen carbon dioxide. In particular, it turned out that the thickness of these layers, rather than what they're made of, creates the otherworldly reflection.
Because there is an immense amount of carbon dioxide frozen in the Martian south pole, Cornell University planetary scientist and lead author of the research Dan Lalich was sure to include layers of this ice in the simulations. And one simulation in particular, with a layer of carbon dioxide ice and below the water ice, revealed that the separation and thickness of layers determined the strength of a reflection.
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