Networks of cameras are making it easier to track meteors

EVERY DAY between 100 and 600 tonnes of rock hurtles into Earth's atmosphere. The reason so little of this bombardment makes it to the planet's surface is that much of it is burnt up by atmospheric friction, which creates the fireball that is the visible sign of a meteor's arrival. As for the bits that do get through, once landed, they are known as meteorites. Roughly 60,000 objects of meteoritic origin have been picked up and catalogued. Most are fragments from a much smaller number of individu...