Sky And Telescope

Even casual observers of the night sky are familiar with the winter constellation Orion. It's two brightest stars, Rigel and Betelgeuse and its three belt stars make it an easy one to spot. But one of them has dimmed dramatically in recent months, the red supergiant star Betelgeuse. 

In this episode, Dave visits with Terri Randall and Avner Tavori, the two filmmakers responsible for the new PBS/NOVA documentary, Saving The Dead Sea. It's one of the saltiest bodies of water on the planet and the lowest elevation on the land surface of the Earth.