Earth

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Astronomical ObjectPlay
Used to refer specifically to the planet we inhabit, not just any planet. SlideScientists search space for conditions like those on earth.
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Not Always LiteralPlay
Can be used figuratively to mean the human world or all of nature. SlideWe must protect the earth for future generations.
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Capitalization VariesPlay
Capitalized as 'Earth' when specifically discussing the planet, lowercase otherwise. SlideAstronauts saw Earth from space.