Dr. Bill Bottke stops by the show to talk about ancient craters on the Moon and Earth. He tells us about how you can figure out crater ages by looking at the nearby rocks, and how that led him and his colleagues to figure out that the impact rate on Earth changes with time.
202: Making atmospheres with Prof. Telus
201: International space law with Cordula Panosch
200: Pluto is a planet, and so is its moon with Dr. Runyon
199: Why can't we find Planet Nine with Prof. Lawler
198: Dragonfly with Dr. Turtle
197: A massive asteroid hit at tremendous speed with Prof. Richardson
196: Spinning universe with Dr. Cheng
195: Dark and quiet skies with Dr. Rawls
194: Exoplanet next door with Prof Whitten
193: Orbital parking spots with Larissa Markwardt
192: Craters on Titan with Prof. Neish
191: Back to Venus with Dr. Getty
190: Millions of observations with Dr. Spoto
189: Long Range Planning with Prof. Barmby
188: Failing is the most important part of science with Tyler Linder
187: You doubt your own existence with Prof. Méndez
186: What's more powerful than a dinosaur with Dr. Noviello
185: Solar system snapshots with Kevin Gill
184: Samples are forever with Prof. Snead
183: The solar wind with Dr. Jian
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