This great blue-green ball.
We live on it, and it sustains us: The Earth. It's impressive and inspiring - and not without threats.
The Perseid meteor shower is as regular as clockwork. It peaks August 12, same as last year. This time we can expect to see twice as many shooting stars, perhaps even a "double peak." But there's loads we don't know.
NASA's Bob Behnken and Doug Hurley are set to make a rare landing off Florida's coast — a maneuver that, if successful, would mark the first splashdown by US astronauts in 45 years. But an incoming storm may pose delays.