The idea that some exotic forms of matter might have 'negative mass' was first proposed in the 1950's.

In 2017, a team from Washington State University described an set of experiments which claimed observation of negative mass particles. Source : BBC

But there is no general agreement about the possible existence of Negative Mass - or what the implications might be. See: Wikipedia

Some proponents of the idea suggest that a universe which contained substantial amounts of 'negative mass' particles might be able to account for the large discrepancies in descriptions of the standard model of the universe - which currently requires Dark Matterplugin-autotooltip__plain plugin-autotooltip_bigDark Matter

"The nature of the dominant component of galaxies and clusters remains unknown.“

Source : Measuring the dark matter equation of state (Mon. Not. R. Astron. Soc. 415, L74–L77)"

In the 1930s, astronomical observations of galaxy rotations showed that the ou… and Dark Energyplugin-autotooltip__plain plugin-autotooltip_bigDark Energy

"The observational results of the latest 15 to 20 years have established a standard model for the cosmology which has some amazing consequences. A mysterious entity, the dark energy, has been confirmed as the dominant component of the Universe, and is also… in order to explain how the observed universe apparently behaves.

See: Introducing the Dirac-Milne universe Astronomy & Astrophysics, Vol. 537

Also see: Massplugin-autotooltip__plain plugin-autotooltip_bigMass

All physical objects have ‘mass’. The mass is (largely) a consequence of the additions of the masses of the atomic and subatomic particles from which the objects are comprised. Theorists currently support the idea of mass-creation via the

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