Researchers in the US say they’ve created a fluid with negative mass in the lab… which is exactly as mind-bending as it sounds.
What it means is that, unlike pretty much every other known physical object, when you push this fluid, it accelerates backwards instead of moving forwards. Such an oddity could tell scientists about some of the strange behaviour that happens within black holes and neutron stars.
But let’s take a step back for a second here, because how can something have negative mass?
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