Within a spectral class, what does the digit 0 indicate?

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Prepare for the NES Earth and Space Science (307) Test. Use flashcards and multiple-choice questions with explanations to enhance your understanding and boost your confidence. Excel in your exam preparation!

Multiple Choice

Within a spectral class, what does the digit 0 indicate?

Explanation:
In this system, stars are sorted into a class by temperature, and each class has subtypes numbered 0 through 9. The numbers reflect temperature, with lower numbers meaning hotter and higher numbers cooler. So the digit 0 indicates the hottest subtype within that spectral class. For example, within a given class, an object labeled with 0 is hotter than those labeled with 1 through 9. This is not the coolest or mid-range subtype, and it isn’t unclassified—the 0 level is simply the hottest end of the scale.

In this system, stars are sorted into a class by temperature, and each class has subtypes numbered 0 through 9. The numbers reflect temperature, with lower numbers meaning hotter and higher numbers cooler. So the digit 0 indicates the hottest subtype within that spectral class. For example, within a given class, an object labeled with 0 is hotter than those labeled with 1 through 9. This is not the coolest or mid-range subtype, and it isn’t unclassified—the 0 level is simply the hottest end of the scale.

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