I see your point. But I wouldn't accept that space itself must expand to move them apart in the current scenario, since that leads to the flatness problem and a

I see your point. But I wouldn't accept that space itself must expand to move them apart in the current scenario, since that leads to the flatness problem and also creates a new problem as to what causes space itself to expand. It would be cleaner to reject the expanding space idea, letting the flatness problem vanish, and then assume that some other unknown physical phenomenon moved the galaxies apart. The expanding space idea also leads to the horizon problem and the dark energy mystery, the blog shows.