Astrophysicist Sergey Popov, Doctor of Physics and Mathematics and science popularizer, invites you to a lecture on black holes, dark matter, and dark energy. Astronomers know how to study things that cannot be seen. Dark matter, dark energy, and black holes do not emit light, but they determine the fate of the universe. Why are scientists sure that they exist? What observations support these standard hypotheses of modern astrophysics, and why do alternatives fall short? The lecture covers how black hole mergers produce gravitational waves, how dark energy upended cosmology in 1998, and current knowledge of dark matter from initial ideas to recent observations. After the lecture, questions, photos, and autographs are available.