This is the 116th most frequent Ukrainian word.
відомо
"Known" or "it is known."
Here, 'відомо' is used in an impersonal construction to mean 'it is known'.
Відомо, що це гарна ідея.
It is known that this is a good idea.
In this sentence, 'відомий' as an adjective, derived from 'відомо', agrees with 'факт' to describe it as 'known'.
Цей факт є добре відомий науковцям.
This fact is well known to scientists.
Here, 'відомо' is used as a personal predicative to mean 'I am aware'.