Question

magnitude means brightness. absolute magnitude tells us how bright a star is. what is the brightness of a blue star in the upper left corner of your h-r diagram? (use the left side numbers to guide you.) hertzsprung-russell diagram (1 point) 20 to 15 10 to 5 0 to -5 -15 to -20

Explanation:

Step1: Analyze H-R Diagram Axes

The y - axis of the Hertzsprung - Russell (H - R) Diagram represents brightness (magnitude), with values decreasing (more negative) as brightness increases (since lower magnitude numbers mean brighter objects). The left - most (blue) region's upper left corner corresponds to the highest brightness (most negative magnitude values).

Step2: Evaluate Option Ranges

• Option "20 to 15": These are high (less bright) magnitude values, not upper left (bright) region.
• Option "10 to 5": Also relatively high (less bright) magnitude values.
• Option "0 to - 5": Not as bright (not as negative) as the upper left of the blue region.
• Option "-15 to -20": These are very negative (very bright) magnitude values, matching the upper left (brightest) part of the blue star region in the H - R Diagram.

Answer:

D. -15 to -20