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Attometer

An attometer (am) is a unit of length in the metric system, equal to one-quintillionth of a meter (1 am = 10⁻¹⁸ meters). This unit is extremely small, even smaller than a femtometer, and is used in theoretical physics to describe distances at the quantum level, such as within particles or in advanced models of spacetime. However, attometers are rarely used in practice because most known physical structures, including subatomic particles, are still larger than this. The attometer mainly appears in scientific equations or hypotheses dealing with concepts beyond current experimental capabilities.

Parsec

A parsec (pc) is a unit of distance used in astronomy, equal to about 3.26 light-years or roughly 31 trillion kilometers. The name “parsec” comes from “parallax of one arcsecond,” referring to the method astronomers use to measure distances to nearby stars based on their apparent shift when viewed from different positions in Earth’s orbit. Parsecs are commonly used to measure distances to stars and galaxies. For example, the nearest star system, Alpha Centauri, is about 1.3 parsecs away. The symbol for parsec is "pc". It’s a convenient unit for expressing large astronomical distances beyond the reach of light-years.