This is a fascinating discussion onextraterrestrial search.  Here is  brief intro on the speaker:

MIT Professor of Planetary Science and Physics Sara Seager shows us the techniques and tools she is using in the real-life search for alien life.

A related comment from the video thread on page 2 had this to say, and it is interesting enough to think about as you hear the speech:

The Earth has been technologically savvy for no more than 200 years. It is more than likely an Earth twin could be more than 200,000 years advanced. Or 200 million. So it is a good (sure) bet than they’ve been aware of us for quite some time. And with methods undreamed of here.

Let’s find out more in the video on the next page

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