"The Interstellar Lighthouse" reexamines the Great Pyramid of Giza, challenging mainstream Egyptology's view of it as merely a tomb for Pharaoh Khufu. Instead, it posits that the pyramid served as prehistoric spaceport infrastructure established by otherworldly progenitors. Inspired by Zecharia Sitchin's interpretations of Sumerian mythology, the book delves into ancient records suggesting the pyramids and other megalithic sites were gateways linking early civilizations to the cosmos. The Great Pyramid is theorized to have functioned as a hydrogen MASER, a cosmic transmitter and precision atomic clock resonating with the 21-centimeter hydrogen line, crucial in radio astronomy and SETI. Its intricate design harnessed gravitational power to generate hydrogen gas, exploiting piezoelectric effects in quartz-laden granite to produce microwave photons at 1.42 GHz. This suggests a profound understanding of cosmic energy and quantum mechanics by an ancient civilization. As we enter the Age of Aquarius, this exploration invites us to uncover ancient mysteries and humanity's cosmic destiny.