Which of the following is a hypothetical subject that studies alien languages?

The question is not only language. What makes us think that "they" will even have any human characteristics?

We can’t even decode other species languages that live on our own planet (various animals). Try sticking closer to home before even attempting such feats.

I don't speak rhhyk

Xenophobia and xenolinguistics...

do aliens exist in real???

Blinky, & Player #25874027, we do. Henry, we are. Lori, lighten up. It is possible that we already have learned an "alien" language or perhaps even languages. These ancient &/or "dead languages" may not have been human developments, could have been alien taught. Could be that all languages could represent different alien species. I love the realm of possibility combined with an open mind & vivid overactive imagination! The color of the sky in my world is plaid & yes, I am waiting for my mother ship! Everything said & done is subject to interpretation.

Blinky, you never know they might be already living with us.

Braniacs, to think that someone came up with a name for this 'hypothetical' job

I love alians

Spooky, Will they have any characteristics at all that we can recognise?

Vanessa, That's how I got it too.