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Re:'Dark fluid' with negative mass could dominate the universe by JamesCoyne on Wednesday December 05, 2018 @03:10PM (#18611969)
Negative mass inverts signs in ways that are not intuitive. Best explanation is a diagram from the author's twitter page [0][1].

When a positive and negative mass particle interact gravitationally the positive mass is repelled and the negative mass is attracted.

[0] https://twitter.com/Astro_Jamie/status/1070303556266283008

[1] https://i.redd.it/qt2tf2tbni221.jpg

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