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UPDATE: The FAA has backed off its claim that the fireball was connected to the satellite collision, so the mystery has been solved -- it was a meteor.

First there was the news last week that a U.S. Iridium communications satellite slammed into a defunct Russian military satellite, each weighing more than a thousands pounds and traveling at 17,500 miles per hour. The collision, taking place about 500 miles over Siberia, created hundreds of pieces of debris to add to the growing total of space junk. Then Sunday video was captured of a mysterious fireball searing across the Texas sky -- but nothing has been discovered on the ground. Coincidence? A meteor or part of a satellite? It's becoming something of a space mystery and we'll have that story tonight on the CBS Evening News with Katie Couric.

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Our energy sources, they are a changin'. With apologies to Bob Dylan, it's absolutely true. Alternative ideas abound from solar to biomass to nuclear to wind and more. But which is best for the environment AND the most practical? Earlier this week, the CBS Evening News featured a story about solar options, Katie Couric did an interview with tycoon T. Boone Pickens about his porposed wind "farm," and tonight on the CBS Evening News with Katie Couric I'll have a story about some of the hidden complications and promises with wind power. We traveled to the town of Sweetwater, TX, and even climbed up inside a massive wind turbine to see firsthand what's happening in that state -- now the country's biggest user/generator of wind energy. I hope you'll tune in.

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