Question

why
is life known to exist only on earth
.​

Answer 1

Aηѕωєя☟

☛There are some essential requirements or factors, which are very necessary for life to exist on any planet.

☛But Luckly, Earth is the only known planet known which fulfills all the requirements of life and proved life.

$\Large\bold\red ❀$ Here are some factors which proved Earth as a supportable life planet :-☟

$\large\bold\red 1.$ ⇨ Presence of essential elements:

The earth has essential elements like carbon, hydrogen, nitrogen and oxygen.

✎These elements combine to form proteins- the building blocks of life.

$\large\bold\red 2.$ ⇨ Presence of oxygen:

Life cannot survive without oxygen. The Earth has a large amount of oxygen in the air.

$\large\bold\red 3.$ ⇨ Presence of water:

Water is also essential for life. The Earth has vast reserves of water.

✎Water regulates body temperature and also helps in processes like digestion, excretion,

$\large\bold\red 4.$ ⇨ Presence of atmosphere:

The atmosphere has a protective layer of ozone gas which saves the Earth from harmful effects of ultraviolet radiation from the sun.

$\large\bold\red 5.$ ⇨ Distance to star (temperature):

The Earth’s distance from the sun gives it the right temperature for the development of life-forms.

✎ If there were even a ten percent increase or decrease in the distance from the sun, the Earth would have been a cold or hot desert

$\large\bold\red 6.$ ⇨Right amount of mass and gravitational force:

The Earth has the right amount of mass. This mass produces strong gravitational force.

✎This force holds the atmosphere intact.

$\bold\pink ❂$ ❥ If all these conditions/ matters match on another planetary / solar system other than ours, then possibly, there might have LIFE, otherwise Nill.

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