I'm guessing you're curious about why so many movies, tv shows, and games reference this aren't you?

Alpha Centauri is probably one of the most important star systems in the galaxy to us because it's the closest, only a mere 4.3 light years away.(yeah real close! lol) Another thing that makes this star system so important is it sports a G2 star which is basicly a sun just like our own except the one in the Alpha Centauri system is bigger. People refer to this star as Alpha Centauri A, she has a little brother named Alpha Centauri B which is a K1 type star and they have one other sibling named Proxima Centauri which is just a red dwarf many say. It's because of this systems G2 type star many believe there may be planets that have oceans and other life producing elements. It's because of this that alot of scifi writers will always want to reference this star system so their work will have a small basis of truth and possibility to it.
"Damn, where the hell do you think these little big-headed grey dudes keep coming from?"

"It's obvious they are coming from somewhere close, probably Alpha Centauri."
by Hobbit May 13, 2004
To be better, striving for advancement. Change from an advanced being in the distant yet close galaxy.

To bypass all religious, agnostic, athiest beliefs and/or non beliefs and what could also be called "reaching across the isle".

Alpha Centauri Star System is also the nearest planetary system to our solar system. The idea is any sentient being with the capability to reach Earth, must be enlightened beyond Earthly beings.

To the nines means to " Strive for perfection".
C'mon man, try not to social lump, just because one earthling stole doesn't mean we're all thieves, Alpha Centauri to the nines.
by Charlie A.Y. Windle February 14, 2021