Spherical flames in space could solve the mystery of soot-free fires

Solving this burning question requires starting fires in space. Ongoing experiments on the International Space Station could help resolve a scientific debate about why some fires burn without producing soot. Made of carbon particles created when fuel fails to burn completely, soot is a pollutant. The particles are linked to health issues, including cancer (SN: 8/4/07, p. 69), and contribute to global warming (SN Online: 3/8/11).
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