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Question 1: At ________, Henry Norris Russell was following a similar course of research.
Princeton UniversityRutgers UniversityHarvard UniversityPrinceton Tigers

Question 2: [3] More massive stars can explode as a supernova,[4] or collapse directly into a ________.
Kerr–Newman metricSchwarzschild metricBlack holeKerr metric

Question 3: In the early part of the 20th century, information about the types and distances of ________ became more readily available.
Binary starSupernovaStarStellar classification

Question 4: For example, white dwarfs are a different kind of star that is much smaller than main sequence stars—being roughly the size of the ________.

Question 5: [28] Stars in the upper main sequence have sufficiently high core temperatures to efficiently use the ________.
Alpha processStellar nucleosynthesisCNO cycleS-process

Question 6: He published the first plots of color versus ________ for these stars.
LuminosityAbsolute magnitudeSiriusApparent magnitude

Question 7: These color-magnitude plots are known as ________ after their co-developers, Ejnar Hertzsprung and Henry Norris Russell.
Hertzsprung–Russell diagramMain sequenceStarBinary star

Question 8: At a stellar core temperature of 18 million ________, the PP process and CNO cycle are equally efficient, and each type generates half of the star's net luminosity.
Rankine scaleKelvinCelsiusThermodynamic temperature

Question 9: In ________ in 1906, the Danish astronomer Ejnar Hertzsprung noticed that the reddest stars—classified as K and M in the Harvard scheme—could be divided into two distinct groups.

Question 10: The values of ________ (L), radius (R) and mass (M) are relative to the Sun—a dwarf star with a spectral classification of G2 V.
LuminosityApparent magnitudeSiriusAbsolute magnitude


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