The Week’s guide to what’s worth watching

The best programs on TV this week

Nova: At the Edge of Space

The hazily defined zone where Earth’s atmosphere meets the vastness of space is one happening place. In this Nova episode, scientists traveling in a high-flying weather observation plane examine such dazzling phenomena as auroras and meteor trails, and work to capture video footage of sprites—flashes of light that shoot upward from thunderclouds but last only a 40th of an eye blink. Wednesday, Nov. 20, at 8 p.m., PBS; check local listings

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