A spacecraft passes Asteroid Ceres at a distance of 4800 km. The telescope on board has an aperture of diameter 0.15 m and operates at a wavelength of 550 nm550\text{ nm}550 nm.
Discuss whether this telescope is suitable for resolving a crater with a diameter of approximately 1.2 km on the surface of Ceres.
The William Herschel Telescope (WHT) has an aperture of diameter 4.2 m. Compare the collecting power of the WHT with the telescope on board the spacecraft.
Discuss why a reflecting telescope, such as a Cassegrain reflector, is preferred over a refracting telescope for use on this spacecraft.
