- A space matryoshka: Kosmos-2519, a military gravimetry satellite, launched Kosmos-2521; Kosmos-2521, a space-to-space scout, then launched Kosmos-2523. Sub-satellites have been done in the past, but sub-sub-satellites? That’s a first. http://www.russianspaceweb.com/napryazhenie.html#orbit 4 comments russia
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