I was working as a security guard for a local hospital. I was in the parking lot, facing in a westerly direction. I have an interest in star constellations. At approximately 2200 hrs.I looked up into the westerly sky. At a very high altitude, I observed an extremely bright sphere, that appeared to be stationary. I looked away for several seconds and when I looked back, it was gone. Approximately twenty mins. later, I observed another simular sphere in the same general area. At first it appeared to be stationary. As I watched it, I observed it traveling at a slow pace in a northerly direction. As I watched it, it changed into a thin line. After five or ten seconds it disappeared completely. There was not any trees or buildings nearby that could have hidden it. I live in an area where airplanes are flying over and am familiar with what they look like at night, even those that fly at high altitudes. I do not believe what I saw was an airplane. It was at an extremely high altitude and did not have time to take a picture with my cellphone.