Final answer:
The average Earth-Sun distance, or astronomical unit (AU), is approximately 150 million kilometers, equivalent to 1.51 × 10¸ Earth radii.
The correct answer from the provided options is b) 1.51 × 10¸ Earths.
Step-by-step explanation:
The distance from Earth to the Sun, commonly referred to as an astronomical unit (AU), is about 150 million kilometers. An AU equals approximately 1.5 x 108 kilometers or 149,597,870.7 meters. This average distance serves as a standard measurement within the solar system and is the baseline for expressing other distances such as the Earth-Sun distance. When Earth is closest to the Sun, known as perihelion, the distance is about 147.1 million kilometers, and when it is furthest, at aphelion, the distance is about 152.1 million kilometers.
Considering the options provided, the correct Earth-Sun distance in terms of Earth radii is 1.51 × 108 Earths, aligning with the standardized AU measurement. It's important to note that this distance can be expressed in different units such as meters, kilometers, and light travel time.