PBS Space Time

PBS Space Time is the most rigorous astrophysics and cosmology channel on YouTube and the one channel on this list that genuinely teaches graduate-level content to a general audience. Hosted by astrophysicist Matt O'Dowd, the channel covers quantum gravity, black hole thermodynamics, the measurement problem in quantum mechanics, inflationary cosmology, and the interpretation of dark matter and dark energy with mathematical depth that most channels avoid. The comment sections are an unusual feature: O'Dowd and his team actively participate, correct errors, and engage with technical questions from viewers at a depth unmatched by any other science channel. The prerequisite: basic calculus and some physics background are helpful, though dedicated non-technical viewers report being able to follow the conceptual content.