Reionization · Asteria Star

Definition

The era when radiation from the first stars and galaxies re-ionized the neutral hydrogen filling the Universe.

Scientific overview

Ultraviolet light from the earliest luminous objects stripped electrons from the intergalactic hydrogen, making the Universe transparent to ultraviolet light again. The timing and sources of reionization are actively being mapped.

Open questions

What sources dominated reionization?
How patchy was it in space and time?

Rests on

Cosmic Dawn & the First Stars

Measured by

James Webb Space Telescope

Planck

Knowledge connections

Depends onCosmic Dawn & the First Stars
Part of modelThe Lambda-CDM Model
Measured byJames Webb Space Telescope
Measured byPlanck
Preceded byCosmic Dawn & the First Stars
Followed byStructure Formation

Sources & references

Facts on this topic will be cited from these primary and reference sources.

NASANational Aeronautics and Space Administration
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.

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