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The pull of gravity
a) To overcome the pull of gravity and reach another body in space you need to achieve a certain speed.
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.