The Star Spot

Feature Guest: Susan Strahan

While human activity is what created the ozone hole, scientists just announced direct evidence that human activity is now responsible for healing that damage. That makes the Montreal Protocol, which banned the emission of chlorofluorocarbons or CFCs, along with other ozone depleting substances, the most successful international environmental agreement to date. Today we’re joined at The Star Spot by Dr. Susan Strahan, who lead a team that studied the reduction of CFCs, to discuss the fall and rise of the ozone layer and what this means for future efforts to achieve international cooperation on critical environmental issues like climate change.

Current in Space

Tabby's star may no longer be the megastructure of another species, but as Tony explains, the way in which we figured that out says quite a lot about this one. 

About Our Guest

Susan E. Strahan is atmospheric scientist at NASA’s Goddard Space Flight Center where she works in the Atmospheric Chemistry and Dynamics Branch. She holds a PhD in Chemistry from the University of California Berkeley. Her research involves making stratospheric trace gas measurements and studying chemistry-climate models. She is a member of the American Geophysical Union and the American Meteorological Society.

 

Direct download: The_Star_Spot_Episode_140.mp3
Category:general -- posted at: 9:00pm EST

Feature Guest: Arjun Berera

Many of you are familiar with the idea of panspermia, the theory that life spreads itself throughout the galaxy by travelling from one world to another. We often think of big objects like asteroids, comets or spacecraft. But a new idea has emerged, and it’s must smaller: dust. Astronomer Arjun Berera joins me here at The Star Spot to discuss his new study, which considers whether alien life can hitchhike between planets on streams of space dust and if life on Earth might have just such an origin.

Current in Space

The solar system's first extrasolar asteroid visitor, Oumuamua, is even stranger than we thought, explains Tony.

About Our Guest

Arjun Berera is Professor in the School of Physics and Astronomy at the University of Edinburgh. He received his PhD from the University of California Berkeley studying aspects of string perturbation theory. His research interests include quantum field theory, statistical physics, early universe cosmology theory and turbulence.

Direct download: The_Star_Spot_Episode_139.mp3
Category:general -- posted at: 9:00pm EST

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