All About Earth

What we call Planet Earth is not just a planet in our Solar System or for that matter it is unlike any other planet in the thousands of galaxies know to us, it is the only planet in the entire Universe to host life, it is our Home.

It took the universe 9.6 billion years to create Earth and it took earth 3.5 billion years to create Life on it. Creation of life is an extremely complex and needless to say time taking process which requires fragile conditions to survive.

About

Our home planet Earth is a rocky, terrestrial planet. It has a solid and active surface with mountains, valleys, canyons, plains and so much more. Earth is special because it is an ocean planet. Water covers 70% of Earth’s surface.

Our atmosphere is made mostly of nitrogen and has plenty of oxygen for us to breathe. The atmosphere also protects us from incoming meteoroids, most of which break up in our atmosphere before they can strike the surface as meteorites.

Since we live here, you might think we know all there is to know about Earth. Not at all, actually! We have a lot we can learn about our home planet. Right now, there are many satellites orbiting Earth taking pictures and measurements. This is how we can learn more about weather, oceans, soil, climate change, and many other important topics.

Structure and Surface

Earth is a terrestrial planet. It is small and rocky. Earth’s atmosphere is the right thickness to keep the planet warm so living things like us can be there. It’s the only planet in our solar system we know of that supports life. It is mostly nitrogen, and it has plenty of oxygen for us to breathe.

 

 

Time on Earth

A day on Earth lasts a little under 24 hour. One year on Earth lasts 365.25 days. That 0.25 extra means every four years we need to add one day to our calendar. We call it a leap day (in a leap year).

Source: NASA.GOV

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