Astronauts experiment with fire in space

Friday, August 22, 2014, 11:06 AM - Astronauts on the International Space Station are playing with fire!

They're conducting experiments on how fuel burns in micro-gravity.

SEE ALSO: Lightning seen from International Space Station.

NASA astronaut Reid Wiseman tweeted out vines of the little fires on Thursday. He wrote they look like "jellyfish on fire."

They're looking at how quickly fuel burns, the conditions needed for soot to form and how mixtures of fuels evaporate before burning.

NASA says the experiments could lead to the development of safer spacecraft, and increased fuel efficiency back on earth.

Slow-motion flame pulse @ISS_Research #SpaceVine - For more FLEX-2 #science info: https://t.co/kXaIBVbiG8 https://t.co/C7xwN0NMKm

— Reid Wiseman (@astro_reid) August 21, 2014