6,000 planets discovered — and we still can't read their atmospheres | with Jonathan Tennyson

The lecture is an excellent example of science communication, delivered by a leading expert in the field. Professor Tennyson’s presentation is both informative and engaging, striking a balance between accessibility and scientific depth. He successfully explains complex concepts such as spectroscopy and quantum mechanics using clear analogies and demonstrations, making them understandable to a general audience without oversimplifying the science.

The scientific content is accurate and up-to-date, reflecting the current state of exoplanet research. Tennyson correctly notes that the number of exoplanet discoveries is not growing exponentially, contrary to popular belief, and he provides a realistic assessment of our ability to detect Earth-like planets. He also addresses the common misconception that we have found ‘Earth 2.0’, clarifying that we have not yet achieved that goal.

The historical context provided, from Fraunhofer’s discovery of spectral lines to the development of quantum mechanics, adds depth to the talk and helps the audience appreciate the scientific progress. Tennyson’s personal anecdotes, such as his initial struggles with chemistry, make the lecture relatable and humanize the scientific process.

The discussion of the challenges in analyzing exoplanet atmospheres is particularly valuable. Tennyson explains the difficulties posed by extreme temperatures and the fact that most exoplanets are not directly observable. He introduces the ExoMol project, which he leads, and explains how it provides essential data for interpreting spectra. This gives the audience insight into the cutting-edge research being conducted.

The lecture also touches on the involvement of schoolchildren in real research, which is inspiring and highlights the importance of public engagement in science.

One minor criticism is that the talk could have benefited from more visual aids to illustrate the spectra and molecular motions, but the speaker’s verbal descriptions were largely sufficient. Additionally, the title’s claim that ‘we still can’t read their atmospheres’ is slightly misleading, as we have made significant progress in analyzing some exoplanet atmospheres, but it is true that we are still limited in our capabilities.

Overall, this is a high-quality lecture that provides a comprehensive overview of exoplanet atmospheric science, suitable for both enthusiasts and those with a scientific background. The speaker’s expertise and passion for the subject shine through, making it a compelling watch.

The title accurately reflects the content: the lecture discusses the discovery of 6,000 exoplanets and the challenges in analyzing their atmospheres.

9/10

Lecture by a leading expert (Massey Professor of Physics at UCL, Fellow of the Royal Society) at the Royal Institution, with rigorous scientific content, historical context, and clear explanations of methods. The talk is based on established research and the speaker's own work (ExoMol project).

• 00:00The Nobel Prize Photo That Discovered the First Exoplanet
• 01:16Why We've Only Found 6,000 Planets in a Galaxy of 20 Trillion Stars
• 02:14Have We Actually Found Earth 2.0? The Honest Answer
• 03:27Planets Hotter Than Most Stars — Lava Worlds & 4,000° Atmospheres
• 04:16The Two Techniques That Find Exoplanets
• 05:33What Are Exoplanets Actually Made Of?
• 07:44Why Auguste Comte Was Spectacularly Wrong About the Stars
• 08:12How We Read the Chemistry of Distant Suns
• 12:48The Moment I Fell in Love with Quantum Mechanics
• 16:36Detecting Water on Jupiter — and Then on Another World
• 19:17The First Detection of Water on an Exoplanet
• 21:28Three Ways to Analyse an Alien Atmosphere
• 27:40The Clever Trick That Detects Molecules You Can't See
• 31:06Can We Just... Look at the Planets Directly?
• 33:44What Temperature Actually Means to a Physicist
• 35:18Building the World's Most Complete Database of Hot Molecule Chemistry
• 47:07Getting Schoolchildren to Do Real Astronomical Research
• 50:28The New Frontier: Ultraviolet Light & Molecules Tearing Apart
• 53:16What Comes Next for Exoplanet Science

• Ri Science Podcast — Mentioned in the video description as a related resource for further listening.
• Editing RI Talks and Moderating Comments — Linked in the video description, providing information about the editing and moderation of Royal Institution talks.
• Donate to the Royal Institution — Linked in the video description as a way to support the Royal Institution.

• ExoMol: molecular line lists for exoplanet and other hot atmospheres — The ExoMol project, led by Jonathan Tennyson, provides the molecular data discussed in the lecture.
• NASA Exoplanet Archive — A comprehensive database of confirmed exoplanets, supporting the numbers mentioned in the lecture.