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Nothing under development right now.

[edit] Comparison of heavy lift launch systems

For this article, heavy lift launch systems are determined as being those capable of lifting at least 20,000 kg to low Earth orbit.

Vehicle	Manufacturer	Mass to LEO (kg)	Mass to GTO (kg)	Cost (Mil $)	Cost/kg (LEO)	Cost/kg (GTO)	Record	Status
Ares V	Alliant Techsystems[1]	130,000					0/0	Development
Ariane 5	EADS Astrium	21,000	10,500				30/34	Operational
Atlas V	Lockheed Martin	20,050	8,200				10/11	Operational
Delta 4 Heavy	Boeing	25,800	10,843				1/2	Operational
Energia	NPO Energia	~100,000						Retired
Falcon 9 Heavy	SpaceX	28,400	12,000	90	3,273	10,000	0/0	Development
Proton	Khrunichev	22,000	6,000					Operational
Space Transportation System	multiple	24,400	3,810				118/120	Opertional
Saturn V	multiple	118,000					12/12	Retired

[edit] Notes