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To better surface relevant, expert, and knowledgeable content in Google Search and News,
today we’re introducing a system called topic authority that helps determine which expert
sources are helpful to someone’s newsy query in certain specialized topic areas, such as
health, politics, or finance.

​Google Search Central Blog  

To better surface relevant, expert, and knowledgeable content in Google Search and News,
today we’re introducing a system called topic authority that helps determine which expert
sources are helpful to someone’s newsy query in certain specialized topic areas, such as
health, politics, or finance.