How do we know the Hubble Parameter is constant in space?

Gork@lemm.ee to

Ask Science@lemmy.worldEnglish · 8 months ago

Since we know that it isn’t constant with time, how can we be sure that it is constant with space? This might be a reason the variability in our measurements which seem to disagree.

Put another way, why couldn’t the universe expand in one direction preferentially compared to another?

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