I can guess you read about this here:
Data Formats in Wolfram|Alpha
http://reference.wolfram.com/language/tutorial/DataFormatsInWolframAlpha.html
Specifically the section called: Obtaining Data Formats Programmatically
The article says this: WolframAlpha["msft close Jan 1, 2011 to Jan 21 2011", {All, "DataFormats"}]
So I typed this: WolframAlpha["satellites overhead", {All, "DataFormats"}]
Then the article says this: WolframAlpha["msft close Jan 1, 2011 to Jan 21 2011", {{"DateRangeSpecified:Close:FinancialData", 1}, "FormattedData"}]
So I typed this: WolframAlpha["satellites overhead", {{"VisibleNonDebrisSatellitesAtDatFromLocation", 1}, "FormattedData"}]
The only result I could get is: Missing[NotAvailable]
I put a link to this thread in the W|a suggestion box. My experience is that it takes a while, but they usually respond eventually.
HTH.
