I admit without any fact that the Oort cloud (comet reservoir) should exist, and

Question

I admit without any fact that the Oort cloud (comet reservoir) should exist, and it seems to be accepted by far by the large majority of astronomers.

But it is still a theory without any direct observation. Except the fact that we guess that comets come from this cloud (a cloud of comets).

So what are the facts or indirect observations that may validate this comet cloud theory?

Collateral to this question, is it easy to observe these indirect facts, and is there any special way to observe these Oort comets to validate the theory?

Is it acceptable to say there is no cloud and just a few solar and most inter-solar objects?

Explanation / Answer

There are several points of evidence that the Oort Cloud exists, though it is indeed still a hypothesis and lacks direct observation.

The first is indirectly observational, as proposed by Ernst

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