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Wouldn’t they be visible from space?

Possibly depending on the weather. But if satellites cover all the earth then they come around to the same location infrequently and you would have to be able to zoom in on all parts of the ocean, which are massive areas in the Pacific and South China sea. You would need a ton of stationary satellites over vast areas of the ocean to cover it all.

Carriers are among the fastest ships in the fleet +30knots so if the information you finally get is dated, the carrier is no longer in that location.

Another thing the US excels in is reconnaissance which helps us to avoid air and sea based enemy assets.