Rallentare?? Deve tutt'altro che rallentare per poter entrare in orbita intorno al Sole senza essere risucchiato!
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Velocity change requirements for reaching near-Sun orbits, such as the orbit of Mercury, are very high. This is due to the steepness of the Sun gravity well. If the Earth
velocity along its orbit is about 30 km/s, the velocity of Mercury is 48 km/s. A Hohmann
transfer Earth-Mercury involves two ∆V s of 7.5 and 9.6 km/s respectively (Table 3).
Such ∆V s are properly colossal by normal space technical standards and lead to exorbitant propellant consumption, if classical chemical propulsion is used.
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