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If you sit here on Earth and shine a light or a radar signal at Mars, it takes

anywhere between 3.2 minutes to 22.2 minutes to hit Mars, depending on

where the Earth and Mars are in their respective orbits.

If you're talking about a person or a machine traveling to Mars at light speed,

then it would take a 10-page paper to discuss the question.

Just to give you an example of the kind of problems it raises: How could you measure

the length of time the trip took ?

-- The clock carried by the traveler and the clock kept by his family on Earth would read

different lengths of time for the trip. According to the best Physics we have, there's no

such thing as "the real time", and they would both be correct.

-- When the traveler got to Mars, and radioed back to let his family know that

he had landed safely, and to ask them how much time had passed on their clock,

it would take between 3.2 and 22.2 minutes for the message to reach them,

and another 3.2 to 22.2 minutes for their reply to return to the traveler.

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12y ago

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