The idea of inertia is that in a vacuum, where there is no friction, objects move along in a straight line at constant speed until you push on them. This tendency was first isolated by Galileo, who ...

A new theory of inertia could explain how NASA is generating thrust with a new drive design, and may even show them how to make it more powerful. Share on Facebook (opens in a new window) Share on X ...

Normally, a plane moves along three rotational axes. “Inertia coupling” takes place when the plane inadvertently moves on two at the same time, usually resulting in loss of control.

NASA’s controversial EmDrive is a curious development. A reactionless propulsion drive that, by all known laws of physics, shouldn’t work, but it does. Despite successful tests, a number of physicists ...