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Wooden_Ad_3096 t1_is4yi6h wrote

Reply to comment by timhamlin in Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science by AutoModerator

The universe is expanding at a rate of 73.3 kilometers per second per mega parsec.

And no, everything isn’t getting bigger because of that. Gravity counteracts the expansion, so it has no affect at our scales.

The expansion really only affects intergalactic scales.

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timhamlin t1_is5dugg wrote

Ok. The expansion on human scale is tiny? But not zero? So on a scale that is external to space (measuring from outside the perspective of being IN space) how much bigger r we compared to the past. Or am I totally off on this?

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Wooden_Ad_3096 t1_is5e3is wrote

We are the same size because gravity and electromagnetism counteracts the expansion.

Basically the expansion “pushes” two things apart, but if they are close enough, their gravity will just pull them together faster.

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