Many astromers contributed to the discovery of celestial bodies. Celestial bodies were not discovered at the same time or by the same people. Galileo Galilei diiscoved details of the bodies of the solar systems, Christiaan Huygens discovered the Saturn moon called Titan.
Franz Saver Von Zach, Edmond Halley, Giuseppe Pizzi, Giovanni Domenico Cassini and many others contributed and discovered different parts of the celestial bodies.