Fire behaves very differently in microgravity — and this ISS experiment shows it beautifully. 🔵 With no “up” in 0g, hot gases don’t rise, so the flame becomes a perfect sphere. Combustion completes more cleanly, giving the flame its blue color. When you see sudden orange patches, that’s soot forming — a brief moment of incomplete burning, similar to flames on Earth. As the droplet burns, tiny asymmetries push it gently through the air until the fuel is gone and the flame silently disappears. |

Take a tour of life aboard the International Space Station! Join NASA astronauts Nicole Mann and Kjell Lindgren as they guide you through station in celebration of 25 years of continuous human presence aboard the orbiting lab. 🎥 Watch the full tour: https://youtu.be/D9gUhAOQ0O4 | International Space Station