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Cosmic distance ladder: Quiz


Question 1:
  • ________ — In the last decade, measurement of eclipsing binaries' fundamental parameters has become possible with 8 meter class telescopes.
    Star systemVariable starStarBinary star

Question 2: The largest source of error with Cepheids as standard candles is the possibility that the period-luminosity relation is affected by ________.
Stellar classificationMetallicitySupernovaStar

Question 3: The amount of shift is quite small, measuring 1 ________ for an object at a distance of 1 parsec, thereafter decreasing in angular amount as the reciprocal of the distance.
AngleMinute of arcLatitudeLongitude

Question 4: These shifts are angles in a right ________, with 1 AU making the short leg of the triangle and the distance to the star being the long leg.

Question 5: For example, all observations seem to indicate that ________ that are of known distance have the same brightness (corrected by the shape of the light curve).
Type II supernovaPulsarNeutron starType Ia supernova

Question 6: Because the more distant steps of the cosmic distance ladder depend upon the nearer ones, the more distant steps include the effects of ________ in the nearer steps, both systematic and statistical ones.

Question 7: The principal one is ________, determining exactly what the absolute magnitude of the candle is.
CalibrationMicrophoneCertified reference materialsMetrology

Question 8: ________ which are both visual and spectroscopic binaries also can have their distance estimated by similar means.
Planetary systemStar systemBinary starVariable star

Question 9: Dynamical parallax, using orbital parameters of ________ to measure the mass of the system and the mass-luminosity relation to determine the luminosity
Variable starStarBinary starStar system

Question 10: The ________, or the magnitude as seen by the observer, can be used to determine the distance D to the object in kiloparsecs (where 1 kpc equals 103 parsecs) as follows:
StarAbsolute magnitudeSupernovaApparent magnitude


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