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Solstice oh-so-bittersweet


Friday marks the official start of summer. Night sky viewing this week includes the opportunity to observe Venus and Mercury in fairly close proximity Thursday. Plus, Lone Signal's METI project allows anybody to send a message to a potentially habitable solar system located a mere 17.6 light years away.

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Watch Now — NOVA: The Looming Satellite Gap


NOVA: The Looming Satellite Gap

We know more about the Earth now than ever before, but that knowledge is in jeopardy as many Earth-observing satellites are nearing the end of their lives. Watch more from NOVA »