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General Questions, Types of Binaries

• Are stars orbiting around each other (in a binary system) common?
• Can we tell that a "star" is actually a binary system if we don't see both stars?
• What is a visual binary system?
• What is a spectroscopic binary system?
• What is an eclipsing binary system?
• Is Sirius a binary star? Is Mizar a binary star? (What kind?)

Star Masses

• Why are binary stars useful in astronomy?
• How can we find out a star's mass?

Close Binaries

• What is so special about the star Algol?
• Can the two stars in a binary system affect each other's evolution?