Topic explanation

Standard explanation

The Big Bang model describes the universe as having evolved from an extremely hot, dense early state and subsequently expanding and cooling.

Key points

• evolution of the observable universe from an early hot, dense state
• v=H₀d
• H=ȧ/a
• Important Clarification: According to the standard cosmological picture: 1. The early universe was extremely hot and dense.
• Formula / Key Relation: A key observational relation is: v=H₀d Expansion is represented by: H=ȧ/a
• The Big Bang model explains an expanding universe that evolved from a hot, dense early state.

Labelled diagram