Earth is the third nearest planet from sun...that's why its atmosphere is nor too hot like Mercury nor too cold like Neptune...

Introduction:
The third nearest planet to the sun is Venus. This can be determined by considering the order of the planets from the sun and their respective distances.

Order of planets from the sun:
1. Mercury
2. Venus
3. Earth

Explanation:
1. Mercury: Mercury is the closest planet to the sun. It orbits at an average distance of about 36 million miles (58 million kilometers) from the sun. Due to its proximity to the sun, Mercury experiences extreme temperatures and has a harsh environment.

2. Venus: Venus is the second planet from the sun and the third nearest planet overall. It orbits at an average distance of about 67 million miles (108 million kilometers) from the sun. Venus is often referred to as Earth's "sister planet" because of its similar size and composition, although it has a thick atmosphere that creates a runaway greenhouse effect, resulting in a scorching surface temperature.

3. Earth: Earth is the third planet from the sun and the fifth largest in our solar system. It orbits at an average distance of about 93 million miles (150 million kilometers) from the sun. Earth is the only known planet to support life, with a diverse range of ecosystems and a unique combination of conditions suitable for the existence of living organisms.

Summary:
In summary, the order of the planets from the sun is Mercury, Venus, and then Earth, making Venus the third nearest planet to the sun. Venus is an intriguing planet with a thick atmosphere and extreme temperatures, while Earth is our home planet, providing a habitable environment for a wide variety of life forms.