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What is the biosphere and how does it compare to Earth's size?

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The biosphere is the part of the earth that can sustain life. It goes from the highest level of the atmosphere that can sustain microbial life, down to the surface, to the bottom of the seas, and into the ground wherever there is liquid water and ... read more

The biosphere is one of the four layers that surround the Earth along with the lithosphere (rock), hydrosphere (water) and atmosphere (air) and it is the sum of all the ecosystems. The biosphere is unique. So far there has been no existence of life elsewhere in the universe. Life on Earth depends on the sun. read more

Below is a model showing the number of Earths you can get inside the Sun. On the other hand if you could melt the Earth into a liquid and pour it into an empty sphere the size of the Sun, then you really could fit in the equivalent of about 1,300,000 Earths, as we calculated before. read more

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