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Discover Ludwig'are unknown' is correct and usable in written English.
You could use it when you want to describe something that is not known or understood. For example: "The exact origins of the mysterious creature are unknown."
Dictionary
are unknown
adjective
Not known; unidentified; not well known.
Exact(60)
There are unknown unknowns".
Their whereabouts are unknown.
Their conditions are unknown.
The customers are unknown.
Others are unknown.
His whereabouts are unknown.
Touré's whereabouts are unknown.
Numbers elsewhere are unknown.
81% are unknown.
The reasons are unknown.
Its effects are unknown.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com