The Astrologers

You’ve managed to contact a civilization of astrologers who love to examine the heavens. What do the Astrologers need to realize about why they can’t communicate with everyone else?

Azagtivo
Btavro
Czulolam-ka
Dqacepo-li
Ehonwze
Ffwrtiput
Gamelte
Hofovalen-ka
Iutqunxe-cws
Jaqupo
Kvwynaq
Lutqunxe-fws
Mzagtivo-li
Nzulalam-ka
Oforovo
Pnafisa
Qaqupo-li
Rforovo-li
Spamono
Tqacepo
Uzulqin
Vvix
Wdefisa
Xegaska
Ykekcwa
Zutqunxe
qacepo zulolam-ka defisa forovo forovo utqunxe-fws zulalam-ka pamono qacepo zagtivo-li qacepo utqunxe-fws zulalam-ka forovo

P.S. Our Galactic Nations contact has told us that some of your English puzzle answers will be useful here, but you will *not* need to use any translations of your puzzle answers. Additionally, some artifacts may prove helpful, but none are absolutely necessary.