The universe doesn't have an outer perimeter, and nothing exists outside it, because there isn't an outside. As an analogy, consider the shape of our galaxy, the Milky Way. We can infer that it is ...
But from where Earth sits in the observable universe, our view extends more than 13 billion years into the past. Far outside our Local Group, astronomers have found galaxies so metal-poor and so ...
And the answer is: no, not really. But in some ways, yes. Look, it's complicated. Our universe is unimaginably vast and contains somewhere around 2 trillion galaxies. These galaxies aren't ...
The Universe has at least three dimensions of space ... These universes are usually thought to be completely disconnected from our own and therefore impossible to detect experimentally.
It began with our cosmic dawn and ushered in the modern era with all its marvelous textures and features. It serves as the backdrop for when the universe grew up. “It’s the last major shift ...