Silver sphere hovered, changed shape, then disappeared.On May 24th, 2017, at approximately 07:12 AM CST, I was driving SE on SH 47 (Riverside Parkway) in Bryan, TX. Just before taking my exit (HSC Parkway), I noticed a spherical, shimmering object hovering over the Snook, TX, area. It appeared basketball in size, silverish in color, and at a high altitude (1-2 miles). The angle on the horizon was approximately 75 degrees. This is close to Easterwood airport, so I initially thought it was a plane, then maybe a helicopter. However, the shape was not quite right.I was driving, so my attention wavered from the object to the road. It was a bright, clear day and I noticed no unusual sounds or nearby objects. As I was about halfway down the exit ramp, the object appeared to change shape into an oblong cylinder and then disappeared. It left no trails or smoke. The event lasted approximately 5-10 seconds. Weather conditions were as follows: Wind , WNW, 9 mph; Humidity 65%; Dew Point 54°; Pressure 29.8;8 in Visibility 10.0 mi. I have a master’s degree and am a middle aged male. I have a good understanding of Astronomy and Physics. I have seen videos of similar events, but was skeptical of them until now. Whatever that object was, it defied the laws of Physics as we know it.