"is exploration" is a grammatically correct and usable phrase in written English.
It can be used as a subject-verb phrase in a sentence to talk about the act or process of exploring something. Example: "Is exploration of new and uncharted territories not the essence of human curiosity and progress?".
Dictionary
is exploration
noun
The act of exploring
synonyms
Exact(23)
No coherent vision, perhaps, yet there is exploration and freedom.
Its aim is "exploration not exploitation", Liu said.
"What it really amounts to is exploration," the president said.
Ms. Adam's strong suit is exploration of movement rather than dramatic imagery.
"The sovereign remedy for ills in a democracy is exploration and exposition of a problem," he writes.
"We have nobody who can tell us how to do it – there is no benchmark," says Piccard. "This is exploration".
Similar(34)
The route he chose was exploration".
The company's focus appeared to be exploration and production.
"No, it's interesting, and for me it's exploration.
We knew it was special; it was exploration, it was danger.
I don't know whether that's exploration or voyeurism or what that is".
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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