#TBT to @ESA_Rosetta's 2015 #ValentinesDay close encounter with comet #67P, during which the spacecraft imaged its own shadow on the comet's surface 📷🛰️ #SpaceSelfie #ThrowbackThursday https://t.co/gsB2Tu8A0x pic.twitter.com/Sqxg5vtmYs
— ESA Science (@esascience) February 15, 2018
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