December night skies: what exactly is a meteor shower?

Imagine cosmic debris, some of it even smaller than a grain of sand, traveling through space at extremely high speeds.Leonids, Perseids, Geminids. Every now and then throughout the year – especially in August, November and December — we step outside to marvel at these meteor showers, sometimes seeing as many as a hundred of these “failling stars” in just one hour. But, strictly speaking, what’s a meteor shower? Moreover, what’s a meteor? A good, succinct answer is provided by Business Insider’s YouTube channel. Take a look at the video below: