Space Cadets! It's time for the annual Perseid meteor shower, which peaks early Tuesday morning as the Earth crosses Comet Swift-Tuttle's dust trail. Bits of rock will put on a light show as they streak through the atmosphere at 37 miles per second. Flee city lights. Go after 11 p.m., but it's better between 2 a.m. and dawn. That's after moonset, when our side of the planet will be headed straight into the comet's trail. Bring a blanket or a lounge chair and just look up.