So what would you say ya do here?

Backstory: I'm a (radio) astronomer. J is 3yrs old. Some weeks ago, we discussed that my job is "researching stars". This morning:

me: We need to get going!
J: I'm going to D's house. E is going to R's house. And you're going to work.
me: That's right.
J: But there are no stars out during the day!
me: !?
J: You can't research!
me: oh snap!

So I explained 1) there are stars during the day, but the Sun makes it too bright to see them, and 2) I use my computer to look at them. Sheesh. Next he's going to ask to see the stars on my computer. Does he believe I actually work?