Astronomer Ken Tapping looks over some of the electronics at the Dominion Radio Astrophysical Observatory near Penticton. Western News file photo

Star Gazing: Mars, the wet planet

Ken Tapping, astronomer with the National Research Council’s Dominion Radio Astrophysical Observatory

Nearly 30 years ago a colleague astronomer at the National Research Council was determined to detect water on Mars.

Water molecules can produce a characteristic radio signature with a wavelength of about 1.35 centimetres. He searched for these radio emissions using one of the largest radio telescopes in North America, the NRC’s 46 metre radio telescope at the Algonquin Radio Observatory. If there was a significant amount of water vapour in the Martian atmosphere, it should have been detectable. None was found.

Widespread scientific opinion at the time was that Mars is almost completely dry, with its polar ice caps made of frozen carbon dioxide rather than frozen water. However, despite this, we really wanted to find water on the Red Planet. It would increase the likelihood of living creatures and would make it easier for us to more easily live there. Apart from using water to drink and to grow things, we can, if we have a good supply of electricity, break water down into hydrogen and oxygen. We can breathe the oxygen, making us less dependent on supplies from Earth.

Our first strong evidence of water on Mars came in the late 1970’s, with the two Viking space missions. Each mission had two parts, an orbiter which would survey Mars from above, and a lander. The orbiters showed dried riverbeds, dry lakes and a host of the erosion and deposition features we associate with flowing water. At some point in its history, Mars was a wet planet. The landers saw barren desert, but with a frosting of water ice forming on the rocks during the cold Martian nights and evaporating in the sunlight. Subsequent orbiters, landers and rovers found copious and conclusive evidence that billions of years ago Mars was a very wet world. We now know a lot of that water is still around. When various Mars rovers drilled into or scraped the ground, they found a thick layer of ice beneath. They also found large deposits of minerals that require water to form. However, is that water permanently sequestered underground or is it actually contributing to Martian processes today?

The current atmospheric pressure on the surface of Mars is about 0.5 per cent of the pressure at the surface of Earth. The thin atmosphere and the low Martian temperatures mean liquid water cannot exist for long on the Red Planet’s surface. It has to either freeze or evaporate. However, orbiting spacecraft are detecting short-lived water flows on hillsides and slopes, where the ice layer gets near to or reaches the surface. The sun warms the ground, so that some of the buried ice melts. The water then flows down the slope as a muddy slurry, until the water evaporates or freezes. There are living creatures on Earth, ranging from bacteria to crustaceans, that lie dormant in dried up pools and frozen soils for years, decades or longer, until some liquid water appears. Then they become active, grow and breed until the water evaporates or freezes, when they go dormant again. It is not inconceivable on those sun-warmed slopes on Mars, where soils get warm enough to melt the ice, that there could be a brief explosion of life, followed by a long period of dormancy.

The action of solar ultraviolet radiation on the minerals on the Martian surface has led to the formation of perchlorates and other highly reactive chemicals not present on Earth. These are toxic to Earthly life forms, but a good source of energy for any living creatures evolved to use them. On Earth there are creatures living in environments too extreme for most living things. We cannot jump to conclusions about Mars; we need to go and look.

Venus is becoming more visible in the after-sunset glow, as a bright, starlike object. In the early hours Jupiter lies in the southern sky with Mars and Saturn to its left. Saturn is a golden colour and Mars is reddish. The moon will be new on April 15.

Ken Tapping is an astronomer with the National Research Council’s Dominion Radio Astrophysical Observatory, Penticton.

Just Posted

Salmon Arm library to undergo upgrades over the winter

New meeting space planned for Okanagan Regional Library’s Salmon Arm branch

Man on scooter injured after being struck by semi on Trans-Canada Highway

Sicamous resident suffers non-life-threatening injuries, charges pending for semi driver

North Okanagan-Shuswap fundraiser delivers for charities

Armstrong Regional Cooperative’s Fuel Good Day raises $10,000 in Vernon, Armstrong and Salmon Arm

Salmon Arm landfill accepts used oil and anti-freeze for recycling

Partnership with Oil Management Association opens recycling opportunities

Algae in Salmon Arm Bay dissipates

Testing by Interior Health indicates low levels to no toxins in the algae

Watch out for Pavement Patty: Drivers warned outside B.C. elementary school

New survey reveals unsafe school zones during 2018 back-to-school week

Letter: Parent urges drivers to slow down in school zones

I want to bring some attention to an issue that has me… Continue reading

First Nations block roads to stop the moose hunt in B.C.’s Interior

Chief Joe Alphonse confirmed Thursday they’ve deactivated the Raven Lake Road and the Mackin Creek Road just before the Island Lake turnoff

‘Like an Alfred Hitchcock movie’: Birds fall dead from the sky in B.C. city

Raptor expert says he’s never seen it happen anywhere in the Lower Mainland

Canada signs global pact to help rid world’s oceans of abandoned fishing gear

The federal Fisheries Minister says it’s a ‘critical issue’

GOP pushing forward for Kavanaugh, accuser wants ‘fairness’

Kavanaugh has denied al allegations of sexual misconduct

Tent city campers now allowed to stay in B.C. provincial park

Contrary to earlier reports, Ministry of Environment says there is no deadline for campers to leave Greater Victoria camp site

Bus company vies to replace Greyhound in Kamloops to Vancouver, Kelowna

Alberta-based Ebus applies to the Passenger Transportation Board to replace Greyhound

Former VP of Lululemon joins B.C. cannabis cultivation facility

Kerry Biggs will be the chief financial officer of True Leaf, in Lumby

Most Read