If Celestia know as the most powerful Alicorn Princess but not invincible, well her mother is far more Powerful, even with the help with Luna, She a never succeed to surpass her in thier training befor be Train by Star swirl on magic! thier mother a never show how powerful she be, not even grogar dont know of it, we dont know how old she be and how old her daugther, plus we dont know who is the father of Celestia and Luna, and we dont how many years both a train with thier mother and final, why she a total mystury? if she the queen of equestria? and most of all, the pony know of her or no one know of her? if Celestia a choice of equestria never who is her mother? or is her Mother dont want equestria know of her? no pony know!

@mbeeston  
Go back to bed, Tirek.

I get that the joke is:  
Mother Mare is heckin’ strong…
 
But WHAT is that rope made out of?!