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[ If you were to fill that jar in the middle of the Milky Way galaxy, it would be full of dark matter (25% of the critical density). If you removed the dark matter, it would be a vacuum which occupies the space defined by the coordinates of the jar itself. Likewise, if you were to fill that jar in the darkness of space, it would be full of dark energy, the remaining 70% of critical density. But it would not be a vacuum until you removed the dark energy. ]

Dark matter?,,,, Dark energy?,,,,
(shining fingernails)
You're really OUT THERE girl.. I mean, waay out there..
And some think that I'M a bit loopy..
You're so far out there you make me seem normal.. I LIKE THAT...

Is dark matter and dark energy real or are they just mental constructs.?.. to answer unanswered questions.?.. or to complete some quantifying algorithm in physics.?.

Thank you for your reply!

AFAIK, neither dark matter nor dark energy can be observed under laboratory conditions. They are identified by inference of the physics and mathematics - as are many such things in quantum physics and geometric physics.

Ordinary matter in fact has never yet been observed or made despite repeated efforts by Fermilab and CERN (the Higgs field/boson in the Standard Model). CERN is about to get better equipment so it may yet be found. But if it is not, then the Standard Model must change.

Of a truth, what we call ordinary matter in space/time may actually be a shadow of momentum components of particle(s) in a fifth time-like dimension. For more: Mysteries of Mass