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The Inmarsat-5 from SpaceX launched earlier today. I was watching the broadcast and noticed a brief green flame during ignition. What caused this? enter image description here


marked as duplicate by Jan Doggen, Brian Tompsett - 汤莱恩, Hohmannfan May 16 '17 at 12:10

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    $\begingroup$ That's a beautiful screen shot! If you search for "green" here you can see that it's been asked already here and there's a good answer. You can read more here as well. $\endgroup$ – uhoh May 16 '17 at 3:29

That's the TEA-TEB mixture used to start the engines. The boron in the TEB is responsible for the green flame.


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