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Cosmologists, starting perhaps with Hubble, say that our galaxy is expanding like a sponge, or a raisin bread. Now if I take only two raisins of this bread which are on its x-axis, am I to understand that :

1. the distance d = x2 - x1 is getting greater,

or

2. the x-axis itself is stretching, such that d = x2 - x1 remains constant

In other words, if I had a very long rigid stick from here to a red-shifted galaxy, would the galaxy then run away from the stick, or would the stick be stretching?

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# What is meant by expanding space

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