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A comment on Biggest dark matter detector spots a single weird particle. Parent comment
"Basic" gravitational equations applied to observed behaviour: clumping and rotation of galaxies, lensing (light bending), etc.
The behaviour implies "something" is exerting force in a mass like way - but there's no visible mass.
Physics "allows for" various types of particles with various types of properties - these may or may not all exist, some do.
Neutrino's from the sun barely interact with anything, consistently capturing them is a challenge.
The observational hole left by the apparent behaviour of "unseen matter" attracts a lot of theory.
The opening paragraphs of, say, https://en.wikipedia.org/wiki/Dark_matter cover the ground of speculation.
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"Basic" gravitational equations applied to observed behaviour: clumping and rotation of galaxies, lensing (light bending), etc.
The behaviour implies "something" is exerting force in a mass like way - but there's no visible mass.
Physics "allows for" various types of particles with various types of properties - these may or may not all exist, some do.
Neutrino's from the sun barely interact with anything, consistently capturing them is a challenge.
The observational hole left by the apparent behaviour of "unseen matter" attracts a lot of theory.
The opening paragraphs of, say, https://en.wikipedia.org/wiki/Dark_matter cover the ground of speculation.