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At the fastest current spacecraft speed (other than re-entry from the Moon), which is about 60000 km/hr, it would take at least 100 days to reach Mercury, depending on its position in its orbit. It could take as long as 120 days.

Most space probes do not accelerate constantly, but use planetary gravity effects to speed up or slow down, which involves long, complex orbits taking a year or more. In this case, a spacecraft actually has to decelerate from the Earth's orbital speed (about 107,000 km/hr) to reach Venus or Mercury.

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14y ago

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