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Earth & Moon
By Ben
Jan 27, 2003, 9:23am

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Topic: Science

ClassBrain Visitor:

What is the size of Earth? How many moons does Earth have?

ClassBrain Response:

Good Questions! There are many ways to measure the size of the earth such as weight, volume, diameter and circumference. You can also compare the Earth' size by relation to other celestial bodies such as the sun.

Our planet weighs in at approximately 5.972 sextillion tons - that is 5,972 followed by 18 zeros!

The earth is approximately a sphere and its volume is 1,097,509,500,000,000,000,000 cubic meters. Very big! It would take you over eight million years to count to the number of cubic meters the earth is.

Earth is 12,742 kilometers (7,900 miles) in diameter. That's how far you would have to tunnel to dig to the other side of the Earth!

The circumference of the earth at the equator is 24,901.55 miles (40,075.16 kilometers).

Kid's Astronomy page, go here.

For an activity to find the circumference of Earth, go here.

To compare the size of the earth to other planets, go here.

The answer to your second question is one moon! The Earth has just one natural satellite, the Moon.

Why does the Earth have only one moon? Go here.

Find out about the moon, go here.