NASA ISS experiment sparks ‘jellyfish on fire’

(CNN/NASA/Reid Wiseman) — Astronauts on the International Space Station are playing with fire. They’re conducting experiments on how fuel burns in microgravity.

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. provides commenting to allow for constructive discussion on the stories we cover. In order to comment here, you acknowledge you have read and agreed to our Terms of Service. Users who violate these terms, including use of vulgar language or racial slurs, will be banned. Please be respectful of the opinions of others. If you see an inappropriate comment, please flag it for our moderators to review.

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