"Atmospheric carbon dioxide is like a chemical
spy... It infiltrates every part of the surface of Mars and
can indicate the presence of water and its history."
Source: Paul Niles, a space scientist at
NASA's Johnson Space Center in Houston, commenting on data from
NASA's Phoenix Mars Lander which suggests that liquid water has
interacted with the Martian surface throughout the planet's history
and into modern times. The research also provides new evidence that
volcanic activity has persisted on the Red Planet into geologically
recent times, several million years ago.
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