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Imagine two very massive stars approaching each other in a central inelastic collision.
This scenario is unlikely, as they would have to be moving in the same orbits. Due to gravity,
their velocities increase relative to a system where the point of impact is at rest.
For a distant observer (in the same system), the "dynamic masses" of the two stars thus increase.
This mass doesn't simply disappear with the collision. Depending on the star,
it transforms into radiation, temperature, gravitational waves, and presumably ghost mass..
Assume the observer could exist at the point of impact. Then, for them, there would be no ghost mass.
However, for them, the "dynamic masses" of the stars would also disappear with the collision and manifest as temperature and radiation. These, however, are associated with redshift for the distant observer.
Ghost mass is therefore always associated with blueshift or redshift.
Ludwig Resch
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