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A sound wave

Sound waves are a form of antigravity because they have negative mass

7 August 2018

As sound waves travel, they float upwards away from the pull of gravity. That’s because they have negative mass, so they’re repelled by massive objects
The Milky Way

Dark matter might be harder to detect because it’s not from our galaxy

2 August 2018

Two thirds of the dark matter in the area near the sun was sucked up when the Milky Way devoured another galaxy, and that might make it harder for us to detect

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