Blok DM-03

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Q15890723




The Blok DM-03, is a Russian upper stage used as an optional fourth stage on the Proton-M and Angara A5 heavy-lift rockets. Three have been launched, the first in December 2010; the first two launches failed before fourth stage ignition, the first as a result of a problem with the Blok DM's fuel load. Some versions are also known as Orion.