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Taking a look at how challenges are being handled to prepare for a manned flight to Mars.
Seasons
Episode 1
Taking a look at how challenges are being handled to prepare for a manned flight to Mars.
Written and Directed by Michael Jorgensen Dr. Paul Delaney, Professor Physics and Astronomy at Toronto’s York University; and Dr. James Garvin, Lead Scientist for Mars and Lunar Exploration at NASA, guide us though the primary challenges. International co-operation is key Leonid Gorshkov of Russia’s Energia Space Agency proudly shows a mock-up of the world’s first manned interplanetary spacecraft, Klipper. After 40 years of building and launching the Mir space station, the Russians have invaluable experience in deep space. It will take at least six months to travel the 56-million kilometres to Mars. The window for a safe return trip might take 1½ years to open. The European Space Agency is tasked with finding the best trajectory for the mission. The effects of zero gravity can lead to dramatic loss of body strength and bone mass. Radiation may prove deadly. Scientists are developing space suits that are both protective and flexible. They are also puzzling over how best to create artificial gravity. Experiments are being carried out in some of the harshest places on Earth. NASA is field-testing a prototype Martian suit in Arizona’s inhospitable Meteor Crater; scientists are searching for life organisms in Chile’s hostile Atacama Desert; and others are testing drills for trying to reach water through the frozen tundra of the Canadian Arctic’s Devon Island. The search for life on Mars may give clues on how that planet could be colonized. Should a major disaster occur on Earth, the inability to emigrate to another planet would make humans as vulnerable as the dinosaurs in ages past.
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Preparing and protecting the human body in deep space may be a greater challenge than all the technological factors in planning a mission to Mars. Living together in a confined environment for up to three years, the six astronauts will become each others’ caregivers. They will face zero gravity with its debilitating effect on muscle and bone mass; solar storms; inescapable cosmic radiation – microscopic particles piercing the skin of the spacecraft and penetrating the bodies of those inside can cause brain damage and cancer. Retired U.S. astronaut and medical doctor Jerry Linenger describes the loss of 65 per cent of his muscle power. For Massachusetts Institute of Technology professor and retired astronaut Jeffrey Hoffman, cosmic radiation felt like “fireworks in my brain.” The intensity of cosmic rays experienced by astronauts on the Mars mission will be greater than that experienced by earlier astronauts and could damage their learning and memory – vital on the journey to Mars. Laurence Young, Apollo Program Professor of Aeronautics and Astronautics with MIT, is developing a method to produce artificial gravity on Earth. Astronauts must be prepared to combat the de-conditioning that goes with long duration weightlessness. Astronauts are training under the ocean and in virtual worlds. If there’s an accident on the long hazardous journey to Mars, the nearest ER is millions of kilometres away back on Earth. Even something as simple as a broken bone can be fatal. The astronauts will have to learn new medical and surgical skills to be able to operate in space. Space walks are always dangerous, whether they happen in Earth's orbit or in deep space. A solar storm would be lethal to an astronaut caught outside. A new protective spacesuit must be engineered. Solar storms, high energy particles packing millions of volts transmitted from the sun, can also play havoc with delicate instruments. A protective shield must be developed for the spacecraft as well. The astronauts chosen for the Mars Mission will be subject to DNA examination. In future, an astronaut’s genes may be altered to ensure he/she is the best possible candidate. The strongest – and the weakest – link of any successful mission to Mars remains the crew. Keeping the astronauts alive is the number one priority.
The greatest test of the human mind will be the projected almost three-year manned mission to Mars and back. Mental breakdown, sexual tension, near-suicide and mutiny have already taken place on shorter Earth orbit and space travel missions. The Achilles’ heel of the Mars mission may be the human factor. Crew selection is perhaps the most critical of choices. At the start of space exploration, NASA selected military test pilots for missions – in the 1960s, one died per week. In the 1980s, scientists and schoolteachers were chosen to orbit Earth. Today, psychiatrists delve into the human psyche to discover the necessary attributes for a successful 21st century astronaut. The Russians have the most experience in long missions. They test candidates by keeping them isolated and awake for days of non-stop repetitive tasks to duplicate the numbing mindless routine of months of space travel. Life onboard will be crowded, noisy and dirty. There will be no water for showering and astronauts will drink their own purified urine. Noise, workload and disrupted circadian rhythms all cause sleep deprivation. Boring and repetitive food saps psychological and physical energy. What’s NASA cooking up for its crews? Sex in space is a possibility with a mixed crew in close quarters. NASA says that is OK and natural, but different nationalities and customs may give rise to misunderstanding and friction. Isolation and confinement can bring out strong emotions, even violence. Sedation and restraint could be necessary. Family problems on Earth could affect an astronaut’s ability to function. New methods of psychological assessment such as software that examines facial movements for signs of emotional disturbance are being tested. Six months of boredom while travelling through space will be followed by six minutes of an astronaut’s life’s most intense activity and terror during the dangerous descent through Mars’ atmosphere. Training a crew to cope with the psychological pressure of his/her imminent death is a major hurdle. Four personality types have been identified as the most perfect for a Mars mission: the driver, the analyst, the motivator and the relationship builder. Thus far, there has only been a 50 per cent success rate for landing un-manned spacecraft on Mars. Landing a manned craft is even more dangerous. The crew must face that grim reality.
The most perilous part of the journey to the Red Planet is the six minutes it will take to travel from the top of the Mars atmosphere to its surface – the six minutes of terror. Landing on Mars is a complex three-step process: entry, descent and landing. Entry into Mars’ atmosphere begins 125 kms above the surface and lasts about two minutes, with the spacecraft hurtling towards Mars at about 16,000 kms an hour. Only a specially designed inflatable aeroshell outside the Mars Lander will protect the capsule and its occupants from a friction created temperature of 4,000 Celsius. The heat shield must also act as a brake. NASA Chief Engineer Rob Manning explains the particular problem of Mars – it does not have enough atmosphere for a spaceship to emulate a landing on Earth – and yet it has too much atmosphere to simulate a moon landing. Within the first two minutes of descent, the heat shield will reduce the craft’s kinetic energy by 90 per cent, and, typically, a parachute system is deployed to further decrease speed. But recent test results have not been good and designer Leonid Gorshkov at Russia’s Energia Space Corporation has decided parachutes are too risky. The Russians are experimenting with descent engines. At the final stage, the astronauts have about 90 seconds to find a landing site that is not only safe but has, or has had, water. Only on such a site can past or present life forms be discovered. In 2005, NASA’s Mars Reconnaissance Orbiter took high-resolution images of the planet to help locate future landing sites. Bob Richards of Optech Industries in Toronto is testing a new generation guidance system, Lidar, which will help the Mars Lander spot obstacles within seconds with a colour-coding radar-like system. Most space agencies plan to send a 40-ton Habitat to Mars ahead of the crew. The astronauts must land close to that advance module, their supply base for 18 months. If they fail to do so, they will die. Filmmaker James Cameron offers an interesting solution. Every time an astronaut steps out of the Habitat, only their spacesuits will protect them from Mars’ hostile environment. A current prototype flexible suit has 20,000 parts, costs $10- million dollars and weighs 95 kilos – too heavy a load. It must protect the astronauts from organ-damaging radiation, penetrating fine dust, dangerous electrical storms and the carbon dioxide of the Mars atmosphere. It is only after the crew are safely on the planet’s surface that the real purpose of the mission can begin – the search for life on Mars
The journey to Mars and the search for life on another planet is the most dangerous and compelling mission in the history of space exploration. Bacteria are the most basic and the hardiest life form. And, either still living or now dead, bacteria are one of the things astronauts will be looking for on the Red Planet. In preparation for the challenges of Mars, scientists are searching for bacteria in the driest and most barren places on Earth. The temperature, valley networks and well-preserved large-impact craters on Devon Island in Canada’s Arctic echo those on Mars. And, 90 per cent of the rocks on Devon Island have bacteria growing on their underside. Canadian scientist Darlene Lim, a member of the NASA Haughton Mars Project Team, explains her contention that the most primitive forms of life to be discovered on Mars might be carbonate formations similar to those in British Columbia’s Pavilion Lake. Chile’s Atacama Desert has had little rain in the last 10 million years making it the oldest and driest desert on our planet. Yet the Atacama yields fluorescent minerals and organic matter. Might ultra-violet headlights on a Mars Rover illuminate life forms which are invisible to us in daylight? Geophysicist Pascal Lee theorizes that “it might merely be that we are members of the same family spread over two planets.” Canadian chemist Alison Skelley is searching for amino acids, one of the building blocks of life, with an ultra-sensitive Mars Organic Analyzer. Bacterial super bugs that once lived on the surface of Mars may have migrated underground, protected from dust and radiation, where only drilling can find them. In addition to drilling for liquid water, the astronauts will search the caves formed by volcanic lava tubes that have been identified on Mars’ surface. Similar tubes exist in New Mexico where, deep underground, Penelope Boston has discovered white bacterial formations living in near freezing droplets of water, feeding off rock. Martian bacteria may be hazardous to humans and cause contagion on Earth. Every precaution must be exercised while transporting samples from the Red Planet. After 18 months searching for life on Mars, the crew must return on a tight schedule with Earth and Mars in the proper alignment. Will their landing capsule be capable of returning the astronauts to the orbiting Mars mothership? If the capsule does not make its scheduled departure, its crew is doomed.
