In 2012, NASA observed a fuel droplet continue burning invisibly in space after the visible flame went out, producing carbon monoxide and formaldehyde

In a groundbreaking experiment, NASA discovered that fuel droplets in space can burn invisibly, producing harmful emissions like carbon monoxide and formaldehyde. This finding has implications for fire safety in space and could change engine design on Earth.

Raccontata daeconomictimes.indiatimes.com