One of the ingredients humans need to make in order to travel to Mars is already there in abundance. And now scientists think they know why: plasma chemistry.
Laboratory studies in the US suggest that perchlorates, the toxic chemical compounds used in rocket fuel and fertilisers, are created naturally on the Red Planet by static electricity inside storms and the whirlwinds known as dust devils.{%recommended 4649%}
These strong electric fields break down gases in the atmosphere, researchers led by Zhongchen Wu from Washington University in the US suggest, and this drives reactions that create perchlorates at a rate that could be as much as 10 million times higher than those driven by sunlight.
That’s significant, both because sunlight is the catalyst used on Earth to create them, and because perchlorates have important implications for Mars habitability.
To test their theory, the researchers created a mini Mars, combining 95% carbon dioxide, 2% nitrogen, 2% argon, and 1% oxygen in a large chamber to simulate the atmosphere. They then added salt as a source of chlorine, and decreased the temperature and pressure.
When the mixture was exposed to electric fields of the right magnitude, some of the gases quickly broke down to form highly reactive, positively charged versions of carbon dioxide, carbon monoxide, and nitrogen molecules. Over time, substantial amounts of chlorates and perchlorates were created.
The findings are reported in a paper published in the journal Earth and Planetary Science Letters.
Perchlorates were first detected in arctic Martian soil by NASA’s Phoenix lander in May 2008, and there was even more excitement when the Curiosity rover found them in the Gale Crater, suggesting their distribution is widespread.
Originally published by Cosmos as Martian wind makes rocket fuel
Nick Carne
Nick Carne is the editor of Cosmos Online and editorial manager for The Royal Institution of Australia.
Read science facts, not fiction...
There’s never been a more important time to explain the facts, cherish evidence-based knowledge and to showcase the latest scientific, technological and engineering breakthroughs. Cosmos is published by The Royal Institution of Australia, a charity dedicated to connecting people with the world of science. Financial contributions, however big or small, help us provide access to trusted science information at a time when the world needs it most. Please support us by making a donation or purchasing a subscription today.