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The phenomenon of inertial mass is defined in Newton's First Law: "Objects move in straight lines at constant speed unless pushed on" but it has never been explained. Quantised inertia explains inertial mass, for the first time, by combining two predictions:

The phenomenon of inertial mass is defined in Newton's First Law: "Objects move in straight lines at constant speed unless pushed on" but it has never been explained. Quantised inertia explains inertial mass, for the first time, by combining two predictions:

# From relativity, an accelerating object will see a Rindler horizon a certain distance away, in the direction opposite to that of its acceleration vector. This is because information is limited to travelling at the speed of light.  

# From relativity, an accelerating object will see a Rindler horizon a certain distance away—in the direction opposite to that of its acceleration vector. This is because information is limited to travelling at the speed of light.  

# An accelerating object will see itself surrounded by a thermal bath of so-called Unruh radiation, as the horizon splits virtual particles, so that they become real.  

# An accelerating object will see itself surrounded by a thermal bath of so-called Unruh radiation, as the horizon splits virtual particles, so that they become real.