Final answer:
The title and publication year of the doctoral dissertation in question are not provided in the reference texts, but historical records indicate it was completed in 1925 by Cecilia Payne-Gaposchkin.
Step-by-step explanation:
The doctoral dissertation of Cecilia Payne-Gaposchkin was not titled "Unveiling the Universe," "The Nature of Matter," or "Quantum Mechanics," nor do the provided reference texts specify the title or publication year. However, based on historical records outside of these references, her influential dissertation, which laid the groundwork for understanding the composition of the Sun and the stars, was completed in 1925. It was indeed a pioneering work in the field of astronomy. Since the provided options do not match the historical information about her dissertation, the correct response to the question would be D) The dissertation information is not provided.