2009-06-21 - Santa Clara, CA - Sphere

I saw a very bright flashing light as big and bright as Venus moving from the west to the east very slowly. The light would flash bright silvery-white then pulsate from the size and brightness of Venus to a pinhead. As this was happening a group of 5 lights moving from the south to the north crossed in front of the bright flashing light. The lights were at different altitudes. The 5 lights were in a group of 3 with 2 lights off to the side.The objects made no sound. The 3 were making circles around each other as they moved. All of a sudden the 5 lights blinked off as did the very bright pulsating light. I figured the big bright light was at about 10,000ft and the 5 others were at about 8,000ft. I see a lot of planes in the sky from the San Francisco and Oakland Airport flying over head and they are that altitude judging from when they turn off their landing lights. This sighting took place in Santa Clara, California.