[DavidSJ]

This isn’t Certhas’s personal theory. It’s part of standard cosmology, called the metric expansion of space. That term should get you pointed in the right direction if you want to learn more about the evidence for it.

[shpeak]

It's too complex to explain, I will not understand it. Right?

[Certhas]

It's not, but it might take more work than reading a few HN comments.