The Astrophysics thing would simply be an Interest, which would grant a +1 bonus to appropriate knowledge checks.
As it stands, the current Electronics rules sort of use the concept of familiarity - I say that because although the skill description say squat on the subject, the inference from the relavent Scientist class ability implies it exists. Cross-reffing the Wheelman, the bonus-granting class version of Familiarity is considered to come with spending a number of hours equal to twice the item's caliber using it, a requirement absent from the Scientist version as a balance against the slightly beefier bonuses of the former.
So, with that in mind, we flip it - until you've spent the requisite amount of time with functioning examples of the tech, you're operating with some sort of penalty (gear caliber times tech-difference penalty times mission caliber seems about right). I'd recommend using the medicine check penalties for the various not-baseline-humans depending on how advanced the tech is and how different its user interface and structure are. Ancients essentially use a form of optical circuit board, so that puts them at either near- or semi-. Goa'uld holographic crystolography. which is rather somewhat different from our use of Integrated circuits is either semi- or quasi-. Something like the new series biological cylons or Moya would be quasi- to non- (and get a synergy from Medicine).
As to the unknown language, that'd be a Decipher/Analysis with synergy from Cultures and Science/Mathematics, and a bonus from any interest involving linguistics or codemaking.