The Big Bang · Asteria Star

The theory

The theory that the universe expanded from an extremely hot, dense early state, first proposed by Georges Lemaître as the 'primeval atom'. The expansion of the universe and, decisively, the discovery of the cosmic microwave background in 1965 established it as the leading account of cosmic history.

Developed by

By

Georges Lemaître

Confirmed by

Knowledge connections

Confirmed byThe Expansion of the Universe
Confirmed byThe Cosmic Microwave Background
Developed byGeorges Lemaître
Part ofModern Astronomy
Required byThe Big Bang

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.
BritannicaEncyclopaedia Britannica
General reference for the history of astronomy, biographies, and cultural context.

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