The discovery was made by theEuropean Space AgencysMars Express orbiter.
The area where the ice lies is known as the Medusae Fossae Formation (MFF).
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How long ago did these ice deposits form, and what was Mars like at that time?
If confirmed to be water ice, these massive deposits would change our understanding of Mars climate history.
Story bySion Geschwindt
Sion is a freelance science and technology reporter, specialising in climate and energy.
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