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You asked:

How big is the Earth?

Earth

Earth: mass - 5,973,600,000,000,000,000,000,000 kilograms; radius - 6,371 kilometres; diameter - 12,742 kilometres; circumference - 40,076 kilometres

wikipedia

How big (in any sense) is Earth, the third planet from the Sun in the Solar System, home to many life forms, including human beings?

Assuming you meant

Earth, the third planet from the Sun in the Solar System, home to many life forms, including human beings

Did you mean?

the world (the geographical area corresponding to the entire surface area of planet earth)

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Analyse this question

▶ How do we know?

Facts

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I used the following facts to provide this answer:

Earth is or has been a terrestrial planet

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Earth is or has been an oblate spheroid

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Earth is a planet

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Earth is a planet

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Earth is an astronomical object

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Earth is having the relationship 'commonly translates as' with "Earth"

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'is the mass of' is a size relation

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5,973,600,000,000,000,000,000,000 kilograms is or has been the mass of Earth

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"Mass" is the right descriptor for 'is the mass of'

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mass is a subclass of scalar quantity

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'is the radius of' is a size relation

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6,371 kilometres is the radius of Earth

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"Radius" is the right descriptor for 'is the radius of'

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length is a subclass of scalar quantity

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'is the diameter of' is a size relation

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12,742 kilometres is the diameter of Earth

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"Diameter" is the right descriptor for 'is the diameter of'

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'is the circumference of' is a size relation

agree disagree edit

40,076 kilometres is the circumference of Earth

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"Circumference" is the right descriptor for 'is the circumference of'

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Answering questions based on 635,025,637 facts on 27,916,402 things

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VERRYYY BIG

This answer was supplied by one of our users. View details.
Posted at 7:30 on February 19, 2012.

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i think is 165,000000000000000000000000000000000000000000000

This answer was supplied by one of our users. View details.
Posted at 8:43 on March 19, 2011.

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External web pages (using standard web search):

Earth - Wikipedia, the free encyclopedia

Earth (or the Earth) is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's ...