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Search google for Apparent magnitude of jupiter and you'll get
Jupiter — Apparent Magnitude: 1.6 to -2.94 According to http://www.answers.com/topic/jupiter - More sources »
It means, google understands semantic tagging, see Wikipedia page about Jupiter. Look on info box on the right.
Better example: supernova type of sn 1987a
SN 1987A — Supernova Type: Type II-P (Unusual) According to http://en.wikipedia.org/wiki/SN_1987A
Update: New semantic search just started- WolframAlpha
