Exoplanets and the search for Life in the Universe by The Royal Institution

About this course

Thousands of planets have been discovered beyond our solar system, and the question is no longer whether exoplanets exist, but how we can read their faint signals to understand what they are like. This free online course takes you into the heart of one of today’s most exciting scientific frontiers: finding distant worlds and assessing whether any could be habitable. You will build a clear, beginner-friendly understanding of how modern astronomy moved from speculation to evidence, and why the hunt for life has become a testable scientific pursuit.

Through a focused narrative that connects discovery, technology, and big-picture thinking, you will explore why many astronomers are optimistic that signs of life could be detected within our lifetime. You’ll learn what makes an exoplanet a promising target, what kind of clues a planet’s environment can leave in the light we observe, and how researchers weigh competing explanations before claiming anything extraordinary. Along the way, you’ll see how this field extends a long tradition of changing humanity’s place in the cosmos, continuing the shift from a universe centered on Earth to one filled with countless potential homes.

A key theme is how we know what we know. You will become familiar with the observational approaches that have confirmed the vast majority of exoplanets, and what their data can and cannot reveal. You’ll also understand why next-generation instruments matter, especially the James Webb Space Telescope, and how its capabilities bring scientists closer to analyzing atmospheric chemistry on worlds many light-years away. Rather than focusing on memorizing facts, the course helps you think like an astronomer: evaluating evidence, recognizing uncertainty, and appreciating the difference between possibility, probability, and proof.

Designed for curious learners and hobbyists, this astronomy experience fits well whether you are returning to science for fun or looking to strengthen your scientific literacy. By the end, you’ll be able to follow news about exoplanet discoveries with confidence, understand the reasoning behind optimistic predictions, and see why the search for life is one of the most profound and rigorous investigations in modern science.