Physics
stars which appear single to the naked eye but are double when seen through a telescope are

quasars
novas and supernovas
binaries
asteroids

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Physics
Thermohaline circulation is mainly due to

Cold, dense ocean water sinking and warmer water replacing it
Winds causing circulation of ocean water
Warm water being added to the ocean due to industial waste
Warmer, less dense water sinking in the ocean and cold water replacing it

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