Scientists hoped it was a lake beneath the ice, but it could have been a mirage.
Scientists investigating a mystery signal from Mars' south pole have proposed a new possible explanation.
It doesn't bode well for the possibility of finding liquid water on Mars.
In 2018, scientists used data from the Mars Advanced Radar on the European Space Agency's Mars Express mission.
That signal, a weird light reflection, originated from the Martian south pole in an area known as the Martian South Pole.
. Researchers analysing the reflection now believe that the signal did not originate with the ice or even with liquid water.
These brilliant reflections are frequently caused by liquid water. Subglacial lakes, such as Lake Vostok in Antarctica, are examples.
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