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binary star are 2 stars that circle around each other traveling in space and Opitcal double are 2 stars that appear close tpgether, but are really far apart.

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What is double stars in which one star moves directly in front of the other?

Each of those is an eclipsing binary.


How big is a binary star?

Binary stars can range in size from a few times the mass of the Sun to substantially larger. They orbit each other due to their mutual gravitational attraction, and their distance from one another can vary widely depending on the specific binary system. The size of a binary star is typically measured in terms of their combined mass, distance between them, and orbital period.


What mizar and alcor made up of?

Mizar is a binary star system consisting of two stars, Mizar A and Mizar B, located in the constellation Ursa Major. Alcor is a nearby star that appears as a single point of light with Mizar, forming an optical double star. Both Mizar and Alcor are composed primarily of hydrogen and helium, like other stars.


What is a pair of stars which appear to form a double star but do not?

A pair of stars that appear to form a double star but are not physically related is called an optical double. These stars only appear close together from our perspective on Earth but are actually at vastly different distances and are not gravitationally bound to each other.


What is a binary star system?

A binary star system is a system in which two stars are orbiting around a common center of mass. These stars are bound together by gravity and can orbit each other in various configurations, such as close binaries where the stars are very close together, or wide binaries where they are farther apart. Binary star systems are common in the universe.

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