This craft was soundless, seemed to float extremely quickly across sky as if it was water

We often enjoy star gazing from our hot tub at night and because my husband works in aviation we like to guess where airplanes are heading and then check them on a radar to see who is closest. This craft was disk or space shaped and was traveling south at a high rate of speed. It was soundless and moved more like it was in water than the sky. It was made of lights but they were not blinking or alternating and were nothing like airplane lights. I would say that it was more or less glowing as it slid across the sky. I first thought it was a shooting star but once my eyes adjusted I realized it was just a fast and unrecognizable craft sliding across the sky. Although it was quick, I had enough time to point it out to my husband and he saw it too and agreed with me that it was a UFO. It’s such a cool, exciting, and eerie feeling!