“The Big Bang theory has been extremely successful in describing the history and evolution of the Universe, and new experiments and observations continue to confirm the basic predictions of this theory. But we do not yet know the answer to the question
What is the Universe made of?
The evidence for dark matter and dark energy has rewritten this question, redirected our efforts to address it — and strengthened the motivation for finding an answer. Dark matter and dark energy cannot be explained by our current model of fundamental physics; deciphering these mysterious substances will require a leap into a new realm of understanding, a theoretical upheaval that will rival the changes brought about by quantum mechanics and general relativity.”
Einstein's Telescope: The Hunt for Dark Matter and Dark Energy in the Universe (2009), Epilogue : Dark Matter and Dark Energy: Keys to the Next Revoution, p. 267
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BBC radio broadcast, March 28, 1949. http://www.joh.cam.ac.uk/library/special_collections/hoyle/exhibition/radio/ Reprinted in April 1949 in The Listener, a BBC magazine.
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[Pavel Kroupa, Has dogma derailed the scientific search for dark matter?, aeon.co, November 2016, https://aeon.co/ideas/has-dogma-derailed-the-scientific-search-for-dark-matter]

The Fabric of the Cosmos : Space, Time, and the Texture of Reality (2004), p. 17
Context: Superstring theory starts off by proposing a new answer to an old question: what are the smallest, indivisible constituents of matter? For many decades, the conventional answer has been that matter is composed of particles... that can be modeled as dots that are indivisible and that have no size and no internal structure. Conventional theory claims, and experiments confirm, that these particles combine in various ways to produce protons, neutrons, and a wide variety of atoms and molecules... Superstring theory tells a different story.... it does claim that these particles are not dots. Instead... every particle is composed of a tiny filament of energy, some hundred billion billion times smaller than a single atomic nucleus, which is shaped like a string. And just as a violin string can vibrate in different patterns, each of which produces a different musical tone, the filaments of superstring theory can also vibrate in different patterns. But these vibrations... produce different particle properties.... All species of particles are unified in superstring theory since each arises from a different vibrational pattern executed by the same underlying entity.

Source: The Best That Money Can't Buy: Beyond Politics, Poverty, & War (2002), p. 18.