i surprisingly haven’t seen anyone talk abt how (book) Grace, after he and Rocky said their goodbyes, did a ridiculous amount of relativistic math to calculate his and Rocky’s relative velocity at any given moment as perceived by his inertial reference frame and then did Lorentz transformations to figure out when the light from Rocky’s engines would drop out of the petrovascope’s perception range just so he would know how much longer he could see Rocky in the distance. so he could check on him every day. because of course he did.















