Negative-mass objects could bend light away in some modified-gravity models
Phys.org says all mass is positive as far as we know, but explores whether negative mass could exist—and how light might offer a clue.
TLDR
Phys.org reports that, in some modified-gravity models, negative-mass objects could bend light away rather than toward them, offering a possible clue to their presence. The outlet explores this possibility while noting that, as far as we know, all mass is positive and positive masses attract one another.
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