The Home Planet
Most know about our planet Earth. It is round and mostly water. We are currently in a crises of global warming. The world will not last much longer if something is not done. This concerns many. So far this is the only inhabitable planet we have found in our solar system.
Earth is the third planet from the sun and has 5 atmospheric layers, Troposphere the closest, Stratosphere this is where most planes fly, Mesosphere here most meteors and rock burn up, Thermosphere most space shuttles orbit in this layer, and last is the Exosphere. The exosphere is where space and the atmospheres merge, it is extremely thin.
For a long time people believed that the earth was the center of the universe and that it was flat. Christopher Columbus had the idea that the world is round and set out to prove it. In setting out upon his quest Columbus took a wrong turn and ended up in what is currently called North America.
Nicolaus Copernicus was a Renaissance mathematician and astronomer who made a heliocentric model of the universe which placed the Sun, rather than the Earth, at the center. This model was rejected by many but was proved to be correct. This changed many things and many people’s thinking.