In the early morning hours on Monday, the Leonid meteor shower will send shooting stars across the sky. Look up on Saturday and Sunday night as well to spot bright meteors with trains streaming behind them. The diminutive Comet Tempel-Tuttle will cross Earth’s orbit, creating a vaporizing shower of debris in the atmosphere. The comet takes 33 years to complete one orbit of the sun. Typically, there are between 10 and 15 meteors per hour. Check online to see when it will be visible in your part of the world. Unfortunately, this year’s shower won’t produce a meteor storm, which...