Literally,“to [the] stars”, as a metaphor for immortality and eternal glory.

• (Classical Latin)IPA^(key):[aˈdas.tra]
• (modern Italianate Ecclesiastical)IPA^(key):[äˈd̪äs.t̪rä]

adastra

1. (idiomatic)to thestars, toheaven(cf.reach for the stars)

   perasperaad astra

   Throughhardshipsto the stars.

   • 29BCE – 19BCE,Virgil,Aeneid9.640:

     macte novā virtūte, puer, sīc īturad astra

     • 2007 translation by Ahl, Frederick

       Blessings on your new manhood, my boy. That’s thepathway to heaven.

• Used in a large variety of poetic expressions and modern mottoes.

• “astrum”, inCharlton T. Lewis and Charles Short (1879)A Latin Dictionary, Oxford: Clarendon Press
• Ad astra (phrase) on Wikipedia