when something seems unlikely to happen
too far in distance
something which is not expected to happen within a given amount of time
a very long time duration
The technological advancement like flying cars is light years away.
A solution to this problem is still light years away.
Some people say that British education system is light years away of the American education system.
The competition is not that tough. In fact, they are light years away.
At that time it seemed light years away, but now I am married and have my own family.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.