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### Theory:

Earth is the only planet where life is known to exist. Earth has only one natural satellite, called Moon.

Earth

Conditions responsible for life:
Some environmental conditions are mainly responsible for the existence of life on Earth. They are,
• Right temperature range
• Presence of water
• Suitable atmosphere, and
• A blanket of ozone
Colour of the planet:
The Earth appears bluish-green from space due to the reflection of light from the water and the landmass on the Earth surface.

Rotation and revolution of the planet:
The Earth's axis is tilted to a side by $$23.5\ degrees$$, which is responsible for the seasonal changes on Earth.

The seasonal cycle of Earth

Earth completes its rotation from west to east in $$23.93\ hours$$ which is approximately $$24\ hours$$, and the period of revolution is $$365.25\ days$$.

Important!
Fun fact!
A person at the age of $$20$$ years would have gone around the Sun $$20$$ times.