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Cygnus X-1 is a binary system with one component not visible. What must the unseen component mass be for astronomers to be confident that this system contains a black hole?
Domestic Industries
Industries that produce goods and services within a particular country, focusing on the local market.
Foreign Supply
The availability of goods or services from international markets offered for sale in a domestic market.
Tariffs
Tariffs are taxes imposed by a government on imported goods, often used to protect domestic industries from foreign competition.
Domestic Consumers
People or families within a nation who buy products and services for their own consumption.
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