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🪐 The galaxy IC 1613, a faint dwarf galaxy in the constellation Cetus, allows astronomers to measure the speed of light by timing how long it takes for changes in certain stars' brightness (called Cepheid variables) to reach Earth. Because the distance to IC 1613 is well known—about 2.4 million light-years—these observations help scientists confirm that light travels at the same universal speed of 299,792 kilometers per second, even across vast reaches of space. ✨ #speedoflight⚡#IC1613⚡#space⚡#nasa⚡#galaxy⚡#stars⚡#astronomy⚡#universe⚡#cosmos 👉subscribe Universe Mysteries 👉more Channels ​