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Name three units to measure extremely la...

Name three units to measure extremely large distances.

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Units used to measure extremely large distances are
(i) Astronomical Unit:
It is the mean distances of the earth fromn the sum. `1Au=1.496xx10^(11)m`
(ii) Light year
It si distance travelled by light in vacuum in one year. 1 ly `=9.46xx10^(15)m`
(iii) Parallactic second:
It ist eh distance at which an arc of length 1 astronomical unit subtends and angle of 1 second of arc. 1 pare sec `=3.084xx10^(16)m=3.26ly`.
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