Clue: Billion-year span
We have 1 possible answer for the clue Billion-year span which appears 4 times in our database.
Possible Answers:
Related Clues:
- 1,000,000,000 years, in geology
- Vast timeframe
- Long historical episode
- Long stretch of time
- About a billion years
- Unit in astronomy
- Mind-boggling time
- Million-millennia period
- Vast age
- Inordinately long time
- About 525 trillion minutes, in astronomy
- Uncountable years
- Astronomical time span
- Umpteen years
- Forever, more or less