Question

define a.m.u,ly,au,parsec

Answer 1

parsec- is a unit of length used to measure large distances to astronomical objects outside the solar system.
a.m.u- is defined as precisely 1/12the mass of an atom of carbon 12.
ly- the light year is an unit of length used to express the astronomical distances and measure about 9.46 trillion kilometers.
au- it is the mean distance between the earth and sun.
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Answer 2

Parsec :-

A unit of distance used in astronomy, equal

to about 3.086 × 10^13km.

The parsec is a unit of length used to measure large distances to astronomical objects outside the Solar System.

AU :-

An astronomical unit of length equal to about 149,597,870.7 kilometres.

It is approximately distance b/w sun and earth.

Light Year :-

The distance that light travels in one year.

The light-year is a unit of length used to express astronomical distances and measures about 9.46 trillion kilometres or 5.88 trillion miles.

amu:-

A unit of mass used to express atomic and molecular weights, equal to one twelfth of the mass of an atom of carbon-12.