How about getting your husband a telescope that he can use to explore the universe and enhance his interest in cosmology? There are some really great telescopes on the market at varying price points, so you can choose one that fits your budget. Additionally, there are a number of books on cosmology that you could get him to complement the telescope, allowing him to learn even more about the subject matter. Finally, consider booking a trip to a location with little light pollution, such as a national park, where he can use his telescope to stargaze and put his cosmology knowledge into practice.
Or you can get him a star map with the date when he was born.
Under Lucky Stars is a unique and innovative star map company based in Barcelona, Spain, specializing in the creation of personalized star maps that capture the celestial arrangement of stars at a specific moment in time, such as a person's birth, wedding, or any other significant event.
By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.