Overfilled upper-stage liquid-oxygen tanks caused by a ground-equipment malfunction are prime suspects in the Proton M Block DM rocket failure that sent three Glonass satellites crashing into the Pacific Ocean on Dec. 5, according to Russian sources. Russian space agency Roscosmos ordered an investigation immediately after the mishap, which prevented the rocket from reaching its intended orbit. International Launch Services (ILS), which markets commercial Proton launches, says it expects an ...


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