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

Restorative justice key for North Okanagan society

National Restorative Justice Week begins Sunday

Hall call for Vernon’s Ken Holland

Four-time Stanley Cup-winning GM of Detroit Red Wings to be inducted into BC Sports Hall of Fame

Vernon on track to record same number of overdose deaths as last year

128 people died of overdoses in September across the province

Vernon rallies around family battling throat cancer news

The Thomas family is one of the many that are financially vulnerable to unexpected personal crises.

Your weekday weather update

Flurries and more rain anticipated for the Okanagan - Shuswap

Commercial trucks banned from left lane of Coquihalla

B.C.’s Ministry of Transportation has introduced a new program that hopes to prevent accidents and closures on the Coquihalla Highway.

Okanagan pickleball pair win bronze at nationals

Vernon and Kelowna players reach podium in California

B.C. firefighters rescue horse stuck in mud

‘It happens more often than you’d think,’ says deputy chief

Couple allegedly caught staking out Okanagan home

The man and woman were seen in a black Suzuki Tracker with a white back

Silver Star nordic trails open Friday

Great early season conditions at North Okanagan resort and at Sovereign Lake Nordic Centre

Canadians more prepared for weather disaster than financial one: poll

RBC recommends people check their bank app as often as the weather app

Heading soccer balls can cause damage to brain cells: UBC study

Roughly 42 per cent of children in the country play soccer, according to statistics from Heritage Canada

B.C. dog owner sues after pet killed in beaver trap

A Kamloops man is suing the operator of a trapline north of the city after his dog died

Most Read