When I asked Collins about this, he told me that the unexpected, counterintuitive, and stunningly precise setting of the cosmological constant “is widely regarded as the single greatest problem facing physics and cosmology today.” “How precise is it?” I asked. Collins rolled his eyes. “Well, there’s no way we can really comprehend it,” he said. “The fine-tuning has conservatively been estimated to be at least one part in a hundred million billion billion billion billion billion. That would be a ten followed by fifty-three zeroes. That’s inconceivably precise.”
