What is the third planet from the sun, known to be the only planet suitable for life?

What is the third planet from the sun, known to be the only planet suitable for life?

• A. Venus
• B. Earth
• C. Mars
• D. Mercury

Answer: (B)

The third planet from the sun is Earth, which is unique in the solar system for its ability to support life. Several critical factors contribute to Earth's suitability for life. First, Earth is located within the "habitable zone" or "Goldilocks zone," where temperatures are just right for liquid water to exist. Water is a fundamental requirement for life as we know it, serving as a solvent for biochemical reactions. Additionally, Earth has a stable atmosphere composed mostly of nitrogen and oxygen, which protects living organisms from harmful solar radiation and helps regulate temperature. The presence of a magnetic field also contributes to this protection by deflecting solar wind and cosmic radiation that could strip away the atmosphere. Earth's diverse ecosystems, rich in biodiversity, further exemplify its ability to support life. Unlike the other planets mentioned, which do not have the right combination of atmospheric conditions, liquid water, and suitable temperatures, Earth has developed a complex web of life, making it the only known planet with such capability.

The third planet from the sun is Earth, which is unique in the solar system for its ability to support life. Several critical factors contribute to Earth's suitability for life.

First, Earth is located within the "habitable zone" or "Goldilocks zone," where temperatures are just right for liquid water to exist. Water is a fundamental requirement for life as we know it, serving as a solvent for biochemical reactions.

Additionally, Earth has a stable atmosphere composed mostly of nitrogen and oxygen, which protects living organisms from harmful solar radiation and helps regulate temperature. The presence of a magnetic field also contributes to this protection by deflecting solar wind and cosmic radiation that could strip away the atmosphere.

Earth's diverse ecosystems, rich in biodiversity, further exemplify its ability to support life. Unlike the other planets mentioned, which do not have the right combination of atmospheric conditions, liquid water, and suitable temperatures, Earth has developed a complex web of life, making it the only known planet with such capability.