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A star can appear bright and yet be cold if it is large and emits light predominantly in the infrared spectrum, which is less perceptible to the human eye. For example, a brown dwarf is a type of celestial object that is too low in mass to sustain hydrogen fusion like a typical star but can still emit significant thermal radiation due to its heat. This can make it appear bright in infrared observations while being relatively cool compared to hotter stars. Thus, brightness does not always correlate with temperature, especially when considering different wavelengths of light.

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2mo ago

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