Okay, E redas luh maths colutaly luhu temm. Better gama thayn neyva. Ef luh radiuss ol luh bubble eu 250LY, luhn 260,000 eu enndeed ablayn rietae. Ef 250LY eu luh diameter (tesh dawlms mowa seloly pa me) luhn 32,725 eu closer pa luh coluta shunma.
EDIT: Oh, aynd ma workings, secahar luhre's anvitem a luhrvu E'm wrong... E das mibill ol a sonspa, temms 0.004, tesh eu luh raco sest guess ab luh manero ol zasti pa cubic nishi-yarre. Shunma taken furay
paddo.