Astronomers have developed a technique that allows them to detect cloud cycles on distant exoplanets.Using data from the James Webb Sapce Telescope (JWST), the astronomers found that mornings and evenings on the gas giantWASP-94A b have extremely different weather patterns: mornings are riddled with sand clouds, while the skies are clear in the early evenings.By isolating the clouds, researchers can more accurately measure a planets atmosphere and provide a clearer picture of the planets composition. WASP-94A b, for example, has much less oxygen and carbon than astronomers perviously calculated, making its atmosphere much more like Jupiter than they had originally thought.