"If Henrietta Leavitt had provided the key to determine the size of the cosmos, then it was Edwin Powell Hubble who inserted it in the lock and provided the observations that allowed it to be turned", wrote David H. and Matthew D.H. Clark in their book Measuring the Cosmos.
"Se Henrietta Leavitt proporcionou a chave para determinar o tamaño do Cosmos, foi Edwin Hubble quen a colocou na fechadura e produciu as observacións que permitiron que a chave se puidese xirar", escribiron David H. e Matthew D. H. Clark no seu libro Measuring the Cosmos.