Star A is a red star. Star B is a blue star. Which star is hotter?

Question

BlackTom AI · Accepted Answer

The question compares Star A, described as red, with Star B, described as blue, and asks which is hotter.
Option 1: 'Star A is hotter.' This is inconsistent with the color-temperature relationship in stars: red colors correspond to cooler surface temperatures, so this statement is incorrect.
Option 2: 'Star B is hotter.' This aligns with the established astronomical fact that blue stars have higher surface temperatures than red stars, making this the correct interpretation of the color cue provided.
Option 3: 'Color is not related to temperature at all.' In stellar astrophysics, color is a direct proxy for surface temperature because a blackbody-like spectrum shifts with temperature, so dismissing color as a temperature indicator is inaccurate.
Option 4: 'They are the same temperature.' The color distinction implies different temperatures, so asserting identical temperatures contradicts the color-based thermometer signal.
Option 5: 'We also need to know the luminosities of the stars to determine their temperatures.' While luminosity and radius (via the Stefan-Boltzmann law) relate to energy output, the color (blue vs red) already indicates a different surface temperature; luminosity is not required to deduce which star is hotter, though it affects total power output. This makes the statement partly true in terms of energy output but incorrect as a method for determining temperature from color alone.
Thus, the reasoning based on the color difference signals that Star B is hotter, while the other options misinterpret color, temperature, or the relationship between luminosity and temperature.

Star A is a red star. Star B is a blue star. Which star is hotter?单项选择题

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