https://**en.wikipedia.org**/wiki/**Negative_mass**

In theoretical physics, **negative mass** is a hypothetical concept of matter whose mass is of opposite sign to the mass of normal matter, e.g. −2 kg.

physics.stackexchange.com/.../**does-matter-with-negative-mass-exist**

Serg: as Qmechanic corrected you, "matter" is the actual stuff, not a number, so it can't be positive or **negative**. The thing that has a numerical value is "mass", not ...

https://**en.wikipedia.org**/wiki/**Exotic_matter**

**Negative mass** would possess some strange properties, such as accelerating in the direction opposite of applied force. For example, an object with **negative** inertial ...

**www.sjsu.edu**/faculty/watkins/mass**negative**.htm

Physicists have from time to time toyed with the concept of **negative mass**, but nothing of significance has come of such speculations. However there does exist a ...

https://medium.com/the-physics-arxiv-blog/cosmologists-prove...

**Negative mass** is the hypothetical idea that matter can exist with mass of the opposite sign to the ordinary stuff. Instead of 2 kg, a lump of **negative mass** would be ...

www.daviddarling.info/encyclopedia/N/**negative_mass**.html

A hypothetical counterpart to ordinary (positive) mass. Although it is not known if **negative mass** exists, or even if its existence is theoretically possible ...

https://www.physicsforums.com/threads/**negative-mass**.179840

Mass is currently defined to be a positive quantity. When certain computations bring about a **negative mass**, we take the absolute value of the number.

https://www.physicsforums.com/threads/**negative-mass**.6962

I remember one of the speculative ideas kicking around a while ago was the notion that mass, like charge, could be "positive" or "**negative**." This was different from ...

https://**www.youtube.com**/watch?v=VX50k8Cs_CQ

**Negative** Plane - Death Mass - Duration: 9:10. W.Z.K.- Doom-Grinding, Hate Worship and Opium Rituals (Cody C. Young) 108 views

secretuniverse.wikia.com/wiki/**Negative_mass**

**Negative mass**, or minus matter is matter composed of minus particles, particles with opposite mass hence energy but with rest of the physical properties identical.