An Exoplanet Orbits Its Star on a Circular Orbit with a Radius

question 47

Multiple Choice

An exoplanet orbits its star on a circular orbit with a radius of 2 AU.If the planet is in the star's habitable zone,the star has a luminosity of:

• A) 1 solar luminosity.
• B) 2 solar luminosities.
• C) 4 solar luminosities.
• D) 16 solar luminosities.

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