First test firing of the SpaceX Raptor engine
SpaceX/Elon Musk
License source: <a rel="nofollow" class="external free" href="https://www.flickr.com/photos/130608600@N05/29323124074">https://www.flickr.com/photos/130608600@N05/29323124074</a> <br> Original source: <a rel="nofollow" class="external free" href="https://twitter.com/elonmusk/status/780275236922994688">https://twitter.com/elonmusk/status/780275236922994688</a> and <a rel="nofollow" class="external free" href="https://www.flickr.com/photos/spacex/29323124074/">https://www.flickr.com/photos/spacex/29323124074/</a>