Concept
Reionization Epoch
When the first stars and galaxies relit the universe.
Between roughly 200 million and 1 billion years after the Big Bang, ultraviolet radiation from early stars and galaxies reionised intergalactic hydrogen.
Overview
Between roughly 200 million and 1 billion years after the Big Bang, ultraviolet radiation from early stars and galaxies reionised intergalactic hydrogen.
See also
Dark Matter
The invisible mass holding galaxies together.
Dark Energy
The mysterious force accelerating the universe.
Gravity
The force that shapes the universe.
Redshift & Hubble's Law
The fingerprint of an expanding universe.
Exoplanets
Worlds orbiting other stars.
Stellar Life Cycle
How stars are born, live, and die.