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Space sciences/Planetary science/Planets/Terrestrial planets/Solar terrestrial planets/Planet Earth

Scientists have detected an underground reservoir of liquid that may be saltwater under Mars' southern polar ice cap.
From fossil hunters to exoplaneteers, this year's finalist celebrate scientific inquiry.

Researchers have identified new surface features that appear on Mars’ slopes during the warm season and fade in the cold season. These clusters of dark lines could potentially be formed by flowing, salty water, though the observations reported in this study do not prove that.