On a dark night, if you look up at the sky, you may see a streak of light as a meteor flashes through the atmosphere. Meteoroids, which are often fragments of comets or asteroids, become meteors once they enter earth's atmosphere. If they hit the ground, they are called meteorites. People often see meteors flash across the night sky, but on rare occasions, people actually see them fall to earth. That's what happened on July 4, 1917 in Colby.