The closest Mercury reaches to Earth is
about 77.3 kilometers away. Many distances in
space are recorded in terms of how fast light
Light can travel to Mercury in about 4.3
minutes, when the two planets are the closest
together. For humans, we will have to think about
spacecrafts. The fastest spacecraft launched by
NASA is the New Horizons mission, traveling
about 80,000 km per hour. That means it
would take approximately 40 days for a human to
reach Mercury from Earth.
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