The Universe is out there, waiting for you to discover it.

Look out at the Universe all you want, with arbitrarily powerful technology, and you'll never find an edge. Space goes on as far as we can see, and everywhere we look we see the same things: matter and radiation. In all directions, we find the same telltale signs of an expanding Universe: the leftover radiation from a hot, dense state; galaxies that evolve in size, mass, and number; elements that change abundances as stars live and die.

The multiverse idea states that there are an arbitrarily large number of Universes like our own out there, embedded in our Multiverse. It's possible, but not necessary, for other pockets within the Multiverse to exist where the laws of physics are different.

But what lies beyond our observable Universe? Is there an abyss of nothingness beyond the light signals that could possibly reach us since the Big Bang? Is there just more Universe like our own, out there past our observational limits? Or is there a Multiverse, mysterious in nature and forever unable to be seen?

Unless there's something seriously wrong with our understanding of the Universe, the Multiverse must be the answer. Here's why.

Artist’s logarithmic scale conception of the observable universe. Note that we're limited in how far we can see back by the amount of time that's occurred since the hot Big Bang: 13.8 billion years, or (including the expansion of the Universe) 46 billion light years. Anyone living in our Universe, at any location, would see almost exactly the same thing from their vantage point. Wikipedia user Pablo Carlos Budassi

The Multiverse is an extremely controversial idea, but at its core it's a very simple concept. Just as the Earth doesn't occupy a special position in the Universe, nor does the Sun, the Milky Way, or any other location, the Multiverse goes a step farther and claims that there's nothing special about the entire visible Universe.

The Multiverse is the idea that our Universe, and all that's contained within it, is just one small part of a larger structure. This larger entity encapsulates our observable Universe as a small part of a larger Universe that extends beyond the limits of our observations. That entire structure — the unobservable Universe — may itself be part of a larger spacetime that includes many other, disconnected Universes, which may or may not be similar to the Universe we inhabit.