In the microgravity environment aboard the International Space Station, an effervescent tablet (antacid) behaves a little differently than back here on Earth. Without the effect of buoyancy, the gases released by the tablet do not rise upwards and simply expand outwards within the colored water. Once the pressure within a bubble is sufficient to overcome the surface tension of the water, it bursts, resulting in the undulations spreading across ball of water.
Source: https://youtu.be/bKk_7NIKY3Y (NASA)
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