Expansion Concept
The
Universe
The Macro Scale
The observable universe is approximately 93 billion light-years in diameter. It contains over 2 trillion galaxies, each home to billions of stars and countless rogue planets adrift in the dark.
Dark Matter
Visible matter — stars, planets, dust, and you — makes up less than 5% of the universe. The rest is divided between dark energy driving cosmic expansion and dark matter acting as the invisible scaffold holding galaxies together.
Cosmic Web
Galaxies are not scattered randomly. They trace vast filaments, converging into massive superclusters. Between them lie immense cosmic voids, hundreds of millions of light-years across, containing almost nothing.