Evidence of water makes issue of life on Mars a hot topic

The answer to a question which has troubled scientists, science fiction writers and rock singers for generations has taken a giant leap forward with the discovery of liquid water flowing freely on the Red Planet.

While past Martian probes have revealed hints of rivers, lakes and even oceans which dried up a long time ago on the planet far, far away, this new discovery offering concrete evidence of water still flowing freely there - at least during the planet’s summer months - takes scientists tantalisingly close to uncovering actual life on Mars.

Nasa’s discovery of water running hundreds of metres down the planet’s canyons and craters has been hailed across this world as a scientific breakthrough of huge importance.

“It is the first verification of liquid flow on Mars and it is very significant,” said Kevin Nolan of the School of Applied Science at the IT in Tallaght. “It is so hard for liquid water to form on the Martian surface, so if we are finding it on the surface then it is very likely there are significant quantities underground too.”

He said it was an accepted scientific fact on Earth that “where there is water, there is life, there is no exception - and that is why Nasa has been following the water on other planets for decades”.

The Martian water only flows when the surface of the planet rises above -23C. Despite the freezing conditions, it can still flow because a high salt content drops the point at which it freezes far below zero degrees Celsius.

Scientists have yet to establish the source of the water but are working off theories that it rises up from underground ice or condenses out of the thin Martian atmosphere.

The newly discovered trickles will most likely by used by space explorers to map the best sites to seek out life on Mars and to establish landing spots for future human missions.

“If we find there is life on two of eight planets in our solar system then it suggests that life is widespread throughout the universe,” Mr Nolan said.