![]() More commonly, the envelope of gas and dust that collapses in on itself to form a star splits and forms two or more stars instead. ![]() Stars travel around the galaxy, and sometimes a massive star captures a passing one, creating a new binary pair. In 1802, Sir William Herschel, who cataloged about 700 pairs of stars, first used the term "binary" in reference to these double stars. ![]() ![]() In 1617, at the request of a fellow scientist, Galileo Galilei turned his telescope toward the second star from the end of the handle of the Big Dipper, discovering that one star seemed to be two ultimately it turned out to be six. The first binary stars seen were visual binaries.
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