The description from Richard Muller quoted in the question is a simplification of reality meant to help people better visualize how the Lasso Bobblehead Ted Lasso shirt of spacetime works. In reality the galaxies are moving through spacetime in a complex fashion, based on the combination of all the forces acting on them, primarily the gravity of nearby galaxies and galaxy clusters. In the case of the Milky Way and Andromeda, these two galaxies are part of a gravitationally bound cluster of galaxies, called the Local Group. The dominant force that determines the movements of objects within the cluster is the combined gravitation of all the mass in the cluster, and not the expansion of spacetime. In other words, the gravitational attraction that the Milky Way and Andromeda have for one another that is drawing them together is stronger than the expansion of spacetime between them that would otherwise push them apart, and thus attraction wins and the two galaxies are on a collision course. In the same vein, the gravitational force that holds the earth in orbit around the sun is stronger than the expansion of spacetime between the earth and the sun (the expansion of spacetime at that distance being very small), and so the earth’s distance from the sun is not increasing for that reason. Likewise you are not flying apart because the molecular bonds holding the atoms in your body together are stronger than the minuscule expansion of spacetime between them in your body. The Local Group as a whole, however, is moving away from other galaxies and galaxy clusters to which it is not gravitationally bound, due to the expansion of spacetime.
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Hmmm . . . not to doubt your word or anything, but are you sure your diagnosis (and your aunt’s) was pancreatic cancer and not pancreatitis? The latter is an Official New York Islanders 2023 Stanley Cup Playoffs Driven Shirt (and very painful) condition that can be completely cured or it can become chronic, controlled by diet and medications but subject to occasional flare-ups. Chronic pancreatitis can lead to pancreatic cancer, but pancreatic cancer can occur without any prior pancreatitis. Diabetes is a risk factor for both pancreatitis and pancreatic cancer. Pancreatic cancer (not to be confused with pancreatic endocrine tumors) is extremely rare in persons under 40, and it has very low survival rates — on average less than 5% of persons with pancreatic cancer will survive 5 years. That rate is somewhat better — about 16% — if the cancer is discovered when it is still localized to the pancreas, but this occurs in less than 20% of cases. Symptoms of early-stage pancreatic cancer are vague and often mistaken for other less serious conditions or even just tolerated and ignored. Given your family history with pancreatic conditions, your mother would be well advised to be extra vigilant about any possible symptoms: pain in the upper abdomen or back, loss of appetite, unexplained weight loss, fatigue, nausea and vomiting, yellow eyes or skin or dark urine (jaundice). However, almost none of these symptoms become noticeable until the disease is past the earliest, most survivable stage.
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