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Is there any difference in the sentences with those phrases below.

There could be billions of the planets like the Earth for all I know.

There could be billions of the planets like the Earth as far as I know.

I have checked a few dictionaries, but still cannot see the difference.

  • as far as I know means you know something about it. For all I know means: it could be that [something is true or not true]. – Lambie Feb 21 '18 at 19:16
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"For all I know" is often used in situations where the statement that you are qualifying with this phrase runs completely contrary to what was said right before that, or is a wild guess that would change everything compared to what was said before.

I don't know why his opinion of these products is so favorable. He could be an investor in the company that produces them, for all I know.

StoneyB has given a rather comprehensive answer on "for all I know" on ELU.

"As far as I know" is not used alongside guesses. It means that you are offering information that is based on what you actually know, but you don't know a lot, or you could be mistaken.

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For all I know. People typically say this when they think they know very little or nothing about a subject. (They have no expertise at all.)

As far as I know. People typically say this when they know at least a little bit about something and may even be true experts in the field, but are granting that no one ever knows everything.

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