Scientists are now proposing a novel method to warm Earth's neighboring planet by pumping engineered particles—similar in size to tinsel and made of iron or aluminum—into the atmosphere as aerosols to trap heat and scatter sunlight toward the Martian surface. The idea is to enhance Mars' natural greenhouse effect to raise its surface temperature by around 28 degrees Celsius over a decade.
This alone wouldn't make Mars habitable, but the scientists who developed this proposal see it as a potentially viable first step.
"Terraforming refers to altering a planet's environment to make it more Earth-like. For Mars, warming the planet is a necessary first step, but it's not enough. Previous concepts focused on releasing greenhouse gases, but those require a large amount of resources that are scarce on Mars," said planetary scientist Edwin Kite of the University of Chicago, who led the research published in Science Advances this week.
"The key elements of our paper are a novel proposal for using engineered nanoparticles to warm the Martian atmosphere and climate modeling showing that this approach could be far more effective than previous concepts. This is important because it offers a more viable method for altering the Martian climate, potentially informing future Martian exploration strategies," Kite added.
NASA has sent robotic rovers to explore the surface of Mars and the InSight lander to study the planet's interior. NASA's Artemis program aims to land astronauts on the surface of the Moon for the first time since 1972 in the coming years to prepare for potential future crewed missions to Mars.
There are many challenges facing human settlements on Mars: a lack of oxygen, harmful ultraviolet radiation from the thin atmosphere, saline soil unsuitable for plant growth, dust storms that sometimes blanket large parts of the planet, and many more. But its frigid temperatures are a serious obstacle.
"We propose to demonstrate that the idea of warming Mars is not impossible. We hope our findings will encourage the scientific community in general and the public to explore this fascinating idea," said lead author Samaneh Ansari, a doctoral student in the Department of Electrical and Computer Engineering at Northwestern University in Illinois (USA).
The average surface temperature of Mars is around minus 65 degrees Celsius. With its thin atmosphere, solar heat on the Martian surface easily escapes into space. This proposal aims to allow liquid water to exist on the Martian surface, where water exists in the form of ice in the polar regions and on the underlying surface.
Scientists propose continuously releasing tiny rod-shaped particles—nanrods—into the atmosphere at a rate of about 8 gallons (30 liters) per second for many years.
"The idea is to transport materials, or better yet, transport manufacturing tools and create nanorods on this planet because iron and aluminum are abundant on the Martian surface," Ansari said.
Researchers are still mindful of the potential for unintended consequences when reshaping another world for the benefit of humankind. For example, scientists are keen to know whether Mars ever harbored life in the past—or perhaps currently, in the form of bacteria beneath its surface.
"Although nanoparticles could potentially warm Mars, both the benefits and costs of this course of action remain uncertain. For example, given the uncertainty surrounding whether Martian soil contains irreversible compounds toxic to all Earth-based organisms, the benefits of warming Mars are negligible," Kite said.
"On the other hand, if a photosynthetic biosphere could be established on the surface of Mars, that could increase the chances of human development in the solar system. In terms of cost, if life exists on Mars, then studying that life could yield enormous benefits, ensuring robust protection for its habitat," Kite added.
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