Heavy lift launch vehicle
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A Heavy Lift Launch Vehicle, or HLV / HLLV, is an orbital launch vehicle capable of lifting between 20,000 to 50,000 kg to low Earth orbit.  The current Heavy-Lift Launch vehicles in service are the Ariane 5 in its ES and ECA variants, the Russian Proton-M and the United Launch Alliance Delta IV Heavy.
- NASA Space Technology Roadmaps - Launch Propulsion Systems, p.11: "Small: 0-2t payloads, Medium: 2-20t payloads, Heavy: 20-50t payloads, Super Heavy: >50t payloads"
- Mallove, Eugene F. and Matloff, Gregory L. The Starflight Handbook: A Pioneer's Guide to Interstellar Travel, Wiley. ISBN 0-471-61912-4.