Question

what was the title of galileo’s book that described his telescope observations? sidereus nuncius de nova stella wo new sciences astronomia nova

Explanation:

Galileo's book that described his telescope observations is "Sidereus Nuncius" (Starry Messenger). "De nova stella" was by Tycho Brahe, "Two New Sciences" focused on mechanics and materials, and "Astronomia nova" was by Johannes Kepler.

Answer:

A. Sidereus Nuncius