If you're outside after sunset tonight, or on any clear evening this month, you should notice a bright star-like object low in the southern sky. It hovers there near the horizon, and at first you might think it was an airplane's landing light. If you've been watching too much TV, you might even think it was a UFO. This particular UFO is easy to identify - It's the star Canopus, second brightest star of the night sky. Canopus, an important star for navigators, is in the constellation of Carina the keel; it marks the rudder of the famous mythological ship Argo, which carried Jason and his crew in search of the Golden Fleece. Folks in the Northern U.S. cannot see this star - the earth blocks it from view. Only at southerly latitudes like Florida can Canopus be seen. When Canopus is near the horizon, the earth's thick atmosphere will even make the star seem to change color, brightness, and shape.