If the no boundary proposal (this page) is correct, an infinity of universes exist in parallel. Each of these universes might well have a different strength for antigravity, especially if string theory is on the right track to a complete understanding of physics. We would then, naturally, live in one of the universes with a comfortably small dark energy; the anthropic principle (this page) reminds us that, if galaxies had never formed, we would not be here to discuss the matter.
