In the H-R diagram, the hottest stars are located on which side?

In the H-R diagram, the hottest stars are located on which side?

• A. Left side
• B. Right side
• C. Top
• D. Bottom

Answer: (A)

The main idea is how the H-R diagram organizes stars by surface temperature and brightness. The horizontal axis shows temperature, with hotter temperatures on the left and cooler ones on the right. Since the hottest stars have the highest surface temperatures, they appear on the left side of the diagram. The vertical axis shows luminosity, not temperature, so a star can be very bright or dim regardless of its left-right position. For concrete images, blue O-type stars (very hot) sit toward the left, while red M-type stars (cooler) sit toward the right.

The main idea is how the H-R diagram organizes stars by surface temperature and brightness. The horizontal axis shows temperature, with hotter temperatures on the left and cooler ones on the right. Since the hottest stars have the highest surface temperatures, they appear on the left side of the diagram. The vertical axis shows luminosity, not temperature, so a star can be very bright or dim regardless of its left-right position. For concrete images, blue O-type stars (very hot) sit toward the left, while red M-type stars (cooler) sit toward the right.