Um, 20.5 LY? Why don't we just focus on our solar system first and then worry about other star systems later?
I still say we build ships to get to the outer planets right now!
Disclaimer:
Occasionally, owing to the deficiency of the English language, I have used he/him/his meaning he or she/him or her/his or her in order to avoid awkwardness of style.
He, him, and his are not intended as exclusively masculine pronouns. They may refer to either sex or to both sexes!