The universe's geometry can be classified as flat, closed (positive curvature), or open (negative curvature), determined by its density and expansion rate. Current cosmological models, primarily ...

What Is the Universe? Real Physics Has Some Mind-Bending Answers Science says the universe could be a hologram, a computer program, a black hole or a bubble—and there are ways to check ...

The universe is literally everything, the sum of all existence. It includes all matter, like stars and galaxies. The universe also includes all radiation and all other forms of energy. No matter ...

The fabric of space-time itself is what is expanding, so we cannot truly say that the universe is expanding “into” anything else.

The more we learn about the universe, the more we discover just how diverse all its planets, stars, nebulae and unexplained chunks of matter really are.

Without this one amazing fact, we wouldn't be able to learn anything meaningful about the Universe at all.

The universe. It's the only home we've ever known. Thanks to its intrinsic physical laws, the known constants of nature, and the heavy-metal-spewing fireballs known as supernovae we are little ...

Recent progress on both analog and digital simulations of quantum fields foreshadows a future in which quantum computers ...

There are many things on large scales that also appear on small scales. But is the Universe truly a fractal?

Our universe is our home; so we'd like to know what it is. But what if we can't? Can we actually define the universe? Is it really a thing, or just an idea?

All this week, we've been contemplating the great mysteries of the universe. Scientists really only understand about 5 percent of what the universe is made of.