The Answer To Life, The Universe — And Everything? It’s 63
Caleb Scharf: When it comes to figuring out the nature of physical reality, part of that process starts at the absolute edge of the observable universe — the cosmic horizon, a distant layer from which light has only just, in this very instant, managed to reach us after more than 13 billion years of racing through space. This intangible boundary between the knowable and the unknowable is, at present, roughly a thousand, trillion, trillion meters across — should you possess the means to measure it. At the other end, in the deepest innards of every single speck of cosmos, is a scale of a hundred billion, trillion, trillionths of a meter. It represents the last meaningful physical scale within our present understanding of physics, a place where space-time itself gets choppy, uncertain, and decidedly problematic. These two extremes span a jaw-dropping 63 orders of magnitude.