What physical effect causes vertical stretching and horizontal squeezing when approaching a neutron star feet-first?

Answer

Tidal forces, which are differences in gravitational pull across an object

Tidal forces, defined as the difference in gravitational pull across an object, cause an approaching body to stretch vertically where gravity is stronger and squeeze horizontally where it is weaker.

What physical effect causes vertical stretching and horizontal squeezing when approaching a neutron star feet-first?

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