[Data-modeling] Astronomy: CelestialObjects andNaturalSatellites

[Danny Hillis]

>
> I was proposing that the the 20 properties go on one type and the  
> other property go on another type instead of having two types with  
> 20 of the same properties.
>
So am I.
>
> I just got your other email. I'll start working on synchronous and  
> asynchronous as the next set of co-types.
Ok thanks. Maybe in the examples you can also show how you would  
handle the hypothetical unknown origin satellite.
-danny