Quote:
Originally Posted by murraypaul
Nor are lightyears, which is why they are used more in science fiction than in reality. The parsec is the preferred unit.
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So
this or
this website are science fiction? What about
NASA? I would give you links to articles, but you would have to pay to view them.
Quote:
Originally Posted by murraypaul
I made no comment either way about the initial argument, just that having to use years so that we can use lightyears is not a good reason.
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I didn't say that we have to use years to use lightyears. The use of candela as the unit for luminous intensity would not depend on people using candles as a light source. I said that would still use lightyears, so the concept of a year would still exist and there would be no reason to discard it from expressing the age of a person.
I also said that if we didn't use lightyears, we could get an unit of measure for time appropriate for measuring the age of a person from the alternative to lightyear. If you want to use parsecs to measure the distance, then you can have a unit of measure for the time it takes a photon to travel the distance of a parsec (3.26 Earth years). This would still be a better choice than hours to express the age of a person.