You need to have the Astonomer carrer and be in the top of one of the two branches. Then you select the Stellar Observatory and choose the Simulon V option.
They will possibly age, but if they can have kids, that can create some awkward things in the present if you bring your sim's descendants (not the future ones) to the present. They may meet the parents or grandparents of your original sim.
It would be great! I also hope they "bring back" Mrs Crumplebottom true husband : Robert Crumplebottom, who died because of a chandelier or something like that. TS1 Mrs. Crumplebottom and TS2 Mrs. Crumplebottom are not the same Sim. Yet they have the same behavior.