"This was taken from Google Earth. This object within the circle was found over california, USA. I could not guess what this object is. Google Earth replaced this area with another one and hence this cannot be found any more."
It's a water drop from condensation on the camera port. Those close in views of Google Earth are not from satellites, they're aerial survey photographs taken from...wait for it...aircraft. As such, they tend to have to deal with the atmosphere and all the things in it.
That is why you can get very nice closeup shots of your house if you live in a city or suburb, but Kansas wheatfields are fuzzy blurs at the same magnification. Those shots are from Landsat.