Suppose there are only two identical galaxies in the Universe with a mass of 10 ^ 12 solar masses, initially not moving relative

Suppose there are only two identical galaxies in the Universe with a mass of 10 ^ 12 solar masses, initially not moving relative to each other. At what distance will their mutual acceleration turn to zero? The density of dark energy is 0.70 of the current critical density of the universe.

1.3 Mpc. This is the characteristic distance at which the Hubble expansion of galaxies becomes noticeable.

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