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bya or b.y.a. is an abbreviation for "billion years ago". It is used as a unit of time to denote length of time before the present, in 109 years. This initialism is often used in the sciences of astronomy, geology, and paleontology.
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billion years 109 scale ga ago used unit often short million uk gya time present astronomy geology paleontology mya abbreviation
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Bya | is a | 109 | 0.90 | text |
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