
Earth
Astronomical Object
Used to refer specifically to the planet we inhabit, not just any planet.

Scientists search space for conditions like those on earth.
Not Always Literal
Can be used figuratively to mean the human world or all of nature.

We must protect the earth for future generations.
Capitalization Varies
Capitalized as 'Earth' when specifically discussing the planet, lowercase otherwise.

Astronauts saw Earth from space.
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