Definition

1. Proper noun:
   • The Big Bang: The prevailing cosmological model for the observable universe's origin, describing its early expansion from an extremely hot, dense initial state approximately 13.8 billion years ago. It is not an explosion in space but rather the rapid expansion of space itself.

Usage

• The term is almost always used with the definite article "the" and is often capitalized when referring to the specific theory.
• It is used as a singular event marking the beginning of the universe as we understand it.

Examples

• As a subject:

  • The Big Bang occurred roughly 13.8 billion years ago.
  • According to the theory, the Big Bang was the start of space and time.

• As an object:

  • Scientists study the cosmic microwave background radiation to learn about the Big Bang.
  • The discovery of the universe's expansion supports the concept of the Big Bang.

• In attributive use (modifying another noun):

  • The Big Bang theory is the leading explanation for the universe's origin.
  • He is an expert on Big Bang cosmology.

Advanced Usage

• "the big bang" (lowercase): Used metaphorically or humorously to describe any sudden, loud, or dramatic beginning or event.
  • The merger of the two companies was the financial big bang of the decade.
  • The concert started with a big bang of fireworks and music.

Variants and Related Words

• Big Bang theory (noun phrase): The scientific theory describing the universe's origin and expansion from the Big Bang.

  • The Big Bang theory is supported by multiple lines of evidence.

• Big Bang nucleosynthesis (noun phrase): The process of forming the first light atomic nuclei (like hydrogen and helium) in the minutes following the Big Bang.

• post-Big Bang (adjective): Referring to the period or conditions after the Big Bang event.

  • The post-Big Bang universe cooled rapidly.

Synonyms

• Cosmic genesis: (Poetic/formal) The beginning of the cosmos.
• Initial singularity: (Technical) The theoretical state of infinite density at time zero of the Big Bang model.

Antonyms

• Steady State theory: A rival, now largely discredited, cosmological model proposing the universe has no beginning and has always existed in a similar state.
• Big Crunch: A hypothetical scenario for the end of the universe, opposite to the Big Bang, where it recollapses.

Related Phrases and Idioms

• Not with a bang but a whimper: An idiom (from T.S. Eliot's poem) meaning something ends not dramatically but feebly. This is often used in contrast to the dramatic beginning suggested by "the Big Bang."
  • The much-anticipated product launch ended not with a bang but a whimper.

Noun

1. (cosmology) the cosmic explosion that is hypothesized to have marked the origin of the universe