Black holes, dark matter, and the fundamental nature of reality. Explore the universe's most profound mysteries.
The observable universe contains over 2 trillion galaxies, each with hundreds of billions of stars. Yet all the matter we can see makes up only 5% of what exists.
The rest? Dark matter and dark energy—mysterious forces that shape the cosmos but remain invisible to us.
Regions of spacetime where gravity is so extreme that nothing—not even light—can escape. The boundary is called the event horizon, a point of no return.
The collapsed cores of massive stars, so dense that a teaspoon would weigh 6 billion tons. Some spin hundreds of times per second.
Supermassive black holes actively consuming matter, outshining entire galaxies. The brightest objects in the universe.
The most energetic events since the Big Bang. In seconds, they release more energy than the Sun will in its entire lifetime.
An invisible substance that doesn't emit light but exerts gravitational force. It holds galaxies together and makes up 27% of the universe.
A mysterious force causing the universe's expansion to accelerate. It comprises 68% of the universe and remains one of science's greatest puzzles.
All matter, energy, space, and time emerge from an infinitely dense point. Physics as we know it breaks down.
The universe is smaller than a proton. Gravity separates from other forces.
The universe expands exponentially, growing from smaller than an atom to larger than a galaxy in a fraction of a second.
Protons and neutrons combine to form the first atomic nuclei: hydrogen, helium, and traces of lithium.
The universe cools enough for electrons to bind to nuclei. Light can finally travel freely—we see this as the Cosmic Microwave Background.
Gravity pulls hydrogen clouds together to ignite the first stars, ending the cosmic dark ages.
The universe continues to expand and cool. On a small blue planet, curious beings wonder how it all began.
We know it exists from its gravitational effects, but we've never detected it directly. Particle accelerators search for candidates.
The Big Bang should have created equal amounts of both, which would have annihilated each other. Why does matter exist at all?
Was there a "before"? Some theories suggest our universe emerged from the collision of higher-dimensional membranes.
With hundreds of billions of galaxies, each with hundreds of billions of stars, are we the only intelligent life? The Fermi Paradox haunts us.
The universe is not only queerer than we suppose, but queerer than we can suppose.— J.B.S. Haldane
The latest from the cosmic frontier.