1. The distance light travels in one year, or approximately 5.88 trillion miles.

2. A figure of speech meaning very advanced.
1. The nearest star is about 4 light years away, and our galaxy is about 100,000 light years across.

2. If alien's exist, chances are they're light years ahead of us in technology.
by OneBadAsp October 21, 2006
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1 Light Year = 9324744613632km

One light year is defined by travelling for 365 days at the constant speed of light, which is 299 792 458 m/s

m = distance in metres
s = time in seconds
Proxima Centauri is 4.3 light-years from the Sun.
by Sek March 18, 2005
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a song on the Kerplunk! album from Green Day, written for Adrienne Armstrong, Billie Joe's wife.

A song about how Billie and Adrienne had just started talking and dating and she had to leave to go back to the other side of the country while he toured.

He was sad and wished to be with her.
I wish I had a boyfriend who wrote me a song like 2000 light years away.
by rreenfay March 13, 2011
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A theoretical unit of measurement used by NASA and related illuminati "scientists" to sell you a completely false cosmological paradigm.
Nasa Scientist 1: I can't wait to rip off tax payers with the heliocentric bullshit.

Nasa Scientist 2: Yea it'll take these dim wits several light years to get the joke.

Nasa Scientist 1: yea lol, wankers
by Basedaf111 August 8, 2022
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Person A: What is a lightyear

Person: B: Light year is the only way to measure the size of ur mother
by dickchungus June 7, 2021
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