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light years
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years-since-birth
Light years, parsecs, and kiloparsecs. Light years and parsecs are used to measure distances between neighbouring star system's, kiloparsecs are used to measure distances within a galaxy.
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light years
it is either light years or kilometers
The standard units used to measure process identification (PID) in control systems are typically in terms of time (seconds), frequency (hertz), and amplitude (volts or decibels).
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They used pencil and paper, or their feet
Light years are used to measure distance from Earth to distant stars and planets.
The ruler, meter stick, yard stick, and tape measure have been used for hundreds of years, with stunningly excellent reliability.