If an Astronomer Wants to Find the Distance to a Star

question 20

Multiple Choice

If an astronomer wants to find the distance to a star that is not variable and is located too far away for parallax measurements, she can:

• A) use the star's light curve
• B) find the star's luminosity class from its spectrum and read the luminosity from an H-R diagram
• C) use Kepler's laws as modified by Newton
• D) search for planets around the star since it is much easier to get the distance to planets
• E) only throw up her hands in desperation; there is no way to even estimate the distance to such a star

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