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Accelerating one ton to one-tenth of the speed of light requires at least 450 petajoules or 4.50 × 10 17 joules or 125 terawatt-hours [3] (world energy consumption 2008 was 143,851 terawatt-hours), [4] without factoring in efficiency of the propulsion mechanism. This energy has to be generated onboard from stored fuel, harvested from the ...
Its mass is 1.2% that of the Earth, and its diameter is 3,474 km (2,159 mi), roughly one-quarter of Earth's (about as wide as the contiguous United States). Within the Solar System , it is the largest and most massive satellite in relation to its parent planet , the fifth-largest and fifth-most massive moon overall, and larger and more massive ...