In another wide-ranging episode, we discuss how atmospheric and oceanic chemistry changes wiped out most life on Earth 250 million years ago, the best evidence yet for a third type of supernova, and the importance…
Category: Space Exploration
Just when the mysterious dimming of nearby giant star Betelgeuse is explained, a more distant giant star was almost completely blocked out. We discuss the very different explanations for these two stellar events, and we…
How many licks does it take to get to the center of Saturn? We don’t know, but when you get there you will find a gooey surprise. Saturn’s core is more massive than previously thought,…
Three missions, including two rovers, are arriving at Mars this month. We preview some of the unique aspects of the Mars Perseverance rover, and we explore the curious case of a giant galaxy with, apparently,…
We go deep on this episode of Walkabout, with new analysis of the lakes on Titan showing the largest may be more than 300 meters deep. In deep space, the long, low rumble of spacetime…