Question

Why does Life exist only on Earth?

Answer 1

Hint: Our home planet is Earth. Earth and its moon, according to scientists, formed around the same time as the rest of the solar system. They believe it happened around 4.5 billion years ago. Earth is the solar system's fifth-largest planet. It has a diameter of approximately 8,000 miles. Furthermore, Earth is the third-closest planet to the sun. It is approximately 93 million miles from the sun on average. Only Mercury and Venus are closer.

Complete answer:
Earth is the only planet in the Solar System that can support life in all of its forms, from simple living microorganisms to highly sophisticated and intelligent humans. This can happen for a variety of reasons.
1) Atmosphere:
- The atmosphere on Earth is breathable. The gas required for most creatures' survival is oxygen. This is found in both the Earth's atmosphere and water. Plants and trees constantly release oxygen into the atmosphere.
- Carbon dioxide is also present in trace amounts in the Earth's atmosphere.
- This is a poisonous gas that makes up the majority of the atmospheres of planets like Venus and Mars, rendering them uninhabitable for human life.
- Its smaller presence on Earth, on the other hand, is beneficial because it helps to moderate the planet's temperature and is absorbed by plants during photosynthesis to produce oxygen.

2) Climate:
- The climate on Earth is suitable. This is due to the moderate amount of carbon dioxide in the planet's atmosphere, which is constantly replenished whenever a volcanic eruption occurs.
- The temperature on Earth also does not vary from one extreme to the other. Mercury's temperature can range from 200°C below freezing to 375°C above. Water would only exist as a gas at 375°C, and the planet would be completely dry.

3) Water:
- There is water on Earth. Water is regarded as the most important chemical required for life. It contains the necessary oxygen for life. Water does not burn the skin (as acidic liquids do), it is drinkable, and it allows life-giving molecules to move freely.
- Other moons in the Solar System, such as Jupiter's Europa, are thought to have oceans of water beneath their icy surface. Scientists believe that the presence of water on other objects in our solar system increases the likelihood of life existing on them.

4) The Sun Light:
- The Sun's light is received by all planets, but none uses it as effectively as Earth. Photosynthesis is a process by which trees and plants on the planet produce oxygen.
- Plants require sunlight to grow. Examine plants in windows and notice how they tend to grow toward the Sun.
- Another factor that aids photosynthesis on Earth is the time it takes the planet to spin once on its axis.
- Because it takes just under 24 hours, each side of the planet receives regular sunlight.
- Without the Sun, there would be no life on Earth. Because of Earth's ideal distance from the Sun, it receives just the right amount of heat and light to support life.
- When we consider a planet like Venus, which takes 243 days to spin on its axis, we can see that certain parts of the planet are completely dark for long periods of time.

6) Earth’s Magnetic field:
- The oxygen required for a large number of living things to breathe is also found in the Earth's atmosphere.
- But what safeguards the environment? Of course, the Earth's magnetic field. There is a load of molten iron at the Earth's core.
- Iron is a highly magnetic element that causes the Earth to act as a single giant magnet. That is why the Earth is said to have a north pole and a south pole.The radiation emitted by the Sun is electromagnetic radiation.
- Because the Earth's iron core generates a magnetic field, it can repel the majority of the Sun's electromagnetic radiation. It prevents the solar wind from robbing Earth of its protective atmosphere in this way.

Note: NASA investigates Earth in order to learn more about how the planet changes. The components of the Earth – land, air, water, and life – are constantly changing. Some of the changes are natural, while others are the result of human activity. Satellites are used by NASA to study the Earth. From space, satellites look toward Earth. They photograph and collect data on all of Earth's components.