Albert Einstein's name may come up often in a college physics class, but you don't hear the renowned physicist's name in the news much.

So you knew that last week's announcement that scientists had discovered gravitational waves Einstein had researched a hundred years ago was big news. In fact, it was historic scientific news.

For the first time, scientists actually heard the sound of two black holes merging in deep space a billion years ago.

What questions did the discovery answer and what questions does it raise?

On Thursday's Smart Talk, we'll ask those questions and learn more about gravitational waves. Our guest is Dr. Andrea Lommen, Associate Professor of Astronomy and Director of the Grundy Observatory at Franklin and Marshall College.

Also, natural gas prices are down. That's good news for consumers who heat their homes with natural gas, but it is having a negative financial impact on gas drillers in Pennsylvania. It also has affected the businesses that were doing well, sprung up, or expanded when drilling took off in the Marcellus Shale.

Now, workers are being laid off and at least one company could be bankrupt.

Joining us on Thursday's show is StateImpact Pennsylvania reporter Marie Cusick to describe the downturn in the gas industry.