Space Shuttle Discovery’s main engine launch sequence on February 24, 2011 (STS-133). The sparks coming into the frame at lower-left are used to ignite the liquid hydrogen - liquid oxygen propellants. [2336 × 3036] via /r/spaceporn http://ift.tt/2pXRyEb
via Tumblr http://ift.tt/2pXYKjA
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