[Oh dear. Matt's about to talk his ear off, sorry.]

So computers are machines, like these devices that we're using now that can process information really fast, and connect to other devices and share information of all sorts. Some are big and powerful, some are tiny and powerful, some just have one function. Back home, pretty much everything runs on computers.

As for the rest, an astronaut is someone who goes off of the planet Earth to explore and do scientific research about planets or space itself beyond where we live. I'm mostly the scientific end, as well as running communications. Being a space nerd just means I love the fascination of outer space.

And... it doesn't really matter. Just... a pain in the tail. Aliens, as in people from other planets, aren't very often believed in at home.