Nearly 14 billion years ago, there was nothing and nowhere. Then, due to a random fluctuation in a completely empty void, a universe exploded into existence. Something the size of a subatomic particle inflated to unimaginably huge size in a fraction of a second, driven apart by negative-pressure vacuum energy. Scientists call this theory for the origin of the universe the Big Bang.
As the Milky Way hurtles thru space, it doesn't travel alone. It's part of a galactic supercluster which astronomers have recently mapped & named 'Laniakea' - Hawaiian for 'immeasurable heaven.' They say it contains about 100,000 galaxies clustered into a roughly heart-shaped structure, all engaged in a common galactic waltz.