Source: Yale University, Open Yale Courses
This second lecture is about exoplanets; professor Bailyn insists about the impossibility to observe directly these planets, because they are too close of their star. The lecture begins at the 6th minute (before that he talks about the problem set). How to convert angular separation into distance. A large part is about scientific notation and some related algebra tips because the calculator is not allowed during tests (!).
See other lectures in this series.
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