关于这张图
Saturn's moon Dione crosses the face of the giant planet in this view, a phenomenon astronomers call a transit. Transits play an important role in astronomy and can be used to study the orbits of planets and their atmospheres, both in our solar system and in others. By carefully timing and observing transits in the Saturn system, like that of Dione (698 miles or 1123 kilometers across), scientists can more precisely determine the orbital parameters of Saturn's moons. This view looks toward the unilluminated side of the rings from about 0.3 degrees below the ring plane. The image was taken in…
