This would be true in a static universe, but, during the 1.2 billion years the waves have been traveling, the universe was experiencing accelerating expansion.<p>For example, the edge of the observable universe is about 46.5 lightyears away, while the universe is thought to be 13.8 billion years.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Observable_universe#Misconceptions_on_its_size" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Observable_universe#Misconcept...</a>