EVERYDAY SCIENCE

Detailed explanation-1: -One famous analogy to explain the expanding universe is imagining the universe like a loaf of raisin bread dough. As the bread rises and expands, the raisins move farther away from each other, but they are still stuck in the dough.

Detailed explanation-2: -One way you can think about the expanding universe is to imagine it as a loaf of raisin bread. As the bread bakes, the raisins in the bread (like the galaxies in our universe) don’t change size, but the dough (the space between galaxies) keeps getting bigger as the loaf rises. Models are a key ingredient in science.

Detailed explanation-3: -“Put a raisin cake in the oven, and it’s very small. Then you let it go, and the distance between the raisins is like the distance between the galaxies – it gets larger and larger with time.” Neta Bahacall, in “Hubble’s Guide to the Expanding Universe”.

Detailed explanation-4: -Rising bread represents the expanding universe and the raisins represent galaxies. The model shows why there need not be a center of the expansion and how all observers in all galaxies perceive more distant galaxies as receding at an increasing rate.