The Oort Cloud: what little is known
Link here. This is one of the best articles on the theorized Oort Cloud, in that right off the bat the author recognizes this important fact:
We know so little about it that its very existence is theoretical — the material that makes up this cloud has never been glimpsed by even our most powerful telescopes, except when some of it breaks free.
The cloud’s existence is extrapolated from the arrival of long period comets, and seems to make sense. Yet, without any direct observations it remains a theory only, and an unproven one at that.
Link here. This is one of the best articles on the theorized Oort Cloud, in that right off the bat the author recognizes this important fact:
We know so little about it that its very existence is theoretical — the material that makes up this cloud has never been glimpsed by even our most powerful telescopes, except when some of it breaks free.
The cloud’s existence is extrapolated from the arrival of long period comets, and seems to make sense. Yet, without any direct observations it remains a theory only, and an unproven one at that.