Dr. David Grinspoon of the Planetary Science Institute gives an interesting update on a number of recent space science developments including the sighting of a comet or asteroid hitting Jupiter, icebergs on Pluto, seas on Charon, salt mounds on Ceres, and gravity maps of Mars: John Batchelor Show –  David Grinspoon, PSI.

And here is a talk with Evalyn Gates, author of Einstein’s Telescope: The Hunt for Dark Matter and Dark Energy in the Universe, about these mysteries of the universe: The John Batchelor Show – Evalyn Gates –