A new test of water ripples supports the idea of quantum heat in a vacuum
This in-the-lab analog of the Unruh effect matches expectations for accelerated motion in space
![empty space](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2017/09/091517_EC_unruh-effect_main_FREE.jpg?fit=860%2C460&ssl=1)
HEAT WAVE Accelerating at a high rate could make empty space seem hot, according to an idea called the Unruh effect. Scientists may have spotted signs of an analogous phenomenon in ripples of water.
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