Beskrivning : Cosmos 154 was a Soviet test spacecraft launched from the Baikonur Cosmodrome aboard a Proton K rocket. It was a probable manned precursor to the Zond series. It reached earth orbit but the Block D translunar injection stage failed to fire (ullage rockets, which had to fire to settle propellants in tanks before main engine fired, were jettisoned prematurely). The spacecraft burned up two days later when orbit decayed.
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