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“double stars”
1. A pair of stars that appear close together in the sky only because they lie in the same direction from the planet Earth:, Double stars are not physically associated binary stars.
2. A system containing two or more stars: In a true double star the stars are physically close to each other in an "optical double". They lie in approximately the same direction from the planet Earth and so appear close to each other, but are actually far apart.
2. A system containing two or more stars: In a true double star the stars are physically close to each other in an "optical double". They lie in approximately the same direction from the planet Earth and so appear close to each other, but are actually far apart.
This entry is located in the following unit:
Astronomy and related astronomical terms
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