Concept
Cosmic Microwave Background
The afterglow of the Big Bang.
Faint microwave radiation filling the entire sky — the cooled remnant of the universe's first light, emitted 380,000 years after the Big Bang.
See also
Cosmic Inflation
An exponential growth spurt right after the Big Bang.
The Big Bang
How everything began, 13.8 billion years ago.
Black Holes
Regions where gravity stops light itself.
Dark Matter
The invisible mass holding galaxies together.
Dark Energy
The mysterious force accelerating the universe.
Light-Year & Astronomical Distances
Measuring the unimaginable.