What Condition Is Necessary on Earth to See Eclipses of Stars

question 193

Multiple Choice

What condition is necessary on Earth to see eclipses of stars in binary star systems?

• A) The stars must have very similar surface temperatures, whatever the inclination of their orbital plane to the line of sight, to see a significant eclipse.
• B) The line of sight from Earth to the star system must be very close to perpendicular to the orbital plane of the stars.
• C) The line of sight from Earth to the star system must be in or very close to the orbital plane of the stars.
• D) One of the stars must be much bigger than the other so that it can hide its smaller companion when the orbital plane is at a large angle to the line of sight.

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