Just a few interesting snippets-
"And finally, we now know that this immense, elastic cosmos, studded with galaxies and fifteen billion years in the making, emerged from an extremely hot and dense small cloud."
"Around every galaxy, astronomers observe a large cloud of material that reveals its existence via the gravitational pull that exerts upon stars and by the way it deflects light. But this great cloud, of which we observe the gravitational effects, cannot be seen directly and we do not know what it is made of. Numerous hypotheses have been proposed, none of which seem to work. It's clear that there is something there, but we don't know what. Nowadays it is called "dark matter". Evidence indicates that it is something not described by the Standard Model; otherwise we would see it."
The above quoted from Seven Brief Lessons On Physics - Carlo Rovell
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"After several-months of perseverance — because it is hard to find moonless and cloudless good nights in Hungary — we succeeded in catching the [Kordylewski dust cloud] around the L5 Lagrange point on two consecutive nights,"
From SPUTNIK International October 27 2018- Updated November 30 2022
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"In fact what they observed had first been seen by a Polish astronomer named Kazimierz Kordylewski in 1961. Kordylewski claimed to have seen a strange cloud at a particular location in the night sky, and he worked out that there must be two of them, another at a corresponding location in relation to Earth and Moon. So these soon became known as 'the Kordylewski Clouds'."
"Fifty-eight years went by and then the Hungarian astronomers, to their great joy, observed the same cloud that Kordylewski had seen. Because it is extremely fine and emits no light it is extremely difficult to see, but they studied it as closely as they could. It was at the exact location that Kordylewski had indicated."
"This is a cloud between the Earth and Moon, though not in a direct line of sight. It is very high above the atmosphere of the Earth and several times larger than our planet."
-From A New Science of Heaven by Robert Temple Published 2021
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"The recent (1961) astronomical observations of K. Kordylewski of Krakow
Observatory (Poland) with respect to the existence of a pair of cloud-like
satellites near each stable L-point are discussed, and a dynamical model is
analyzed which yields results that are in substantial agreement with the
observations."
-From a 48 page declassified publically available document titled
THE LEAST DENSITY OF A SPHERICAL SWARM
OF PARTICLES, WITH AN APPLICATION TO
ASTRONOMICAL OBSERVATIONS OF
K. KORDYLEWSKI
Frederick V. Pohle
MRC Technical Summary Report #351
December 1962
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"Perhaps one of the most interesting open questions is the existence of a mysterious and unaccounted for form of matter, called "dark matter," permeating the universe that is unseen by light but is nonetheless indirectly inferred from its gravity."
"We can indirectly "see" dark matter as it bends light by its own gravitation, making enormous cosmic lenses in the sky. But, as of this writing, while there are more theories of dark matter than there are feferal cats in Chicago, the particle that constitutes dark matter has not been produced and detected in a particle accelerator experiment..."
"Dark matter definitely informs us that there are things out there that we do not yet understand and that go beyond the philosophy contained in our Standard Model."
- From Beyond the God Particle by Leon Lederman and Christopher Hill Published 2013