. This diagram maps the data gathered from 1994-2013 on small asteroids impacting Earth's atmosphere to create bright meteors, technically called "bolides" and commonly referred to as "fireballs." Sizes of red dots (daytime impacts) and blue dots (nighttime impacts) are proportional to the optical radiated energy of impacts measured in billions of Joules (GJ) of energy, and show the location of impacts from objects about 3 feet (1 meter) to almost 60 feet (20 meters) in size. Planetary Science