an explosion that some scientists believe happened 15 billion years ago and caused the universe to begin to exist. This belief is called the Big Bang Theory.
Synonyms and related words
The scientific study of the universe
astronomer
astronomical telescope
astronomical unit
the Big Bang
nounastronomy
US
DEFINITIONS1
1
an explosion that some scientists believe happened 15 billion years ago and caused the universe to begin to exist. This belief is called the Big Bang Theory.