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The pull of gravity
b) A journey to Mars from Earth’s surface requires a minimum total speed of nearly 30,000mph.
e) Due to the moon’s weaker gravitational field, the same journey from the lunar surface would “only” require a speed of 6,500mph (2.9km/s).
d) This is roughly one third of that necessary to reach the International Space Station from Earth.
c) This requires large rockets, tonnes of fuel, and complex orbital manoeuvring.
a) To overcome the pull of gravity and reach another body in space you need to achieve a certain speed.
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