There are about 100,000 balls of ice and rock -- comets, really -- out there, that are 50 miles in diameter or more, and they regularly take a little spin, in towards the Sun and pass reasonably close to us.
Il y a environ 100 000 boules de glace et de pierre -- des comètes -- là-haut, qui font 80 km de diamètre et plus, et elles font régulièrement un petit tour en direction du soleil et passent relativement proche de nous.