# 10 how many times bigger is earth than the moon Ideas

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s the moon?

Earth’s moon is the brightest object in our night sky. But how big is the moon? The moon’s mean radius is 1,079.6 miles (1,737.5 kilometers) and the mean diameter is 2,159.2 miles (3,475 km). Compared to Earth, the moon is less than a third the width of our home planet, according to NASA (opens in new tab). The moon’s equatorial circumference is 6,783.5 miles (10,917 km).

At first, the moon may appear quite large, but that is only because it is our closest celestial body — approximately 238,855 miles (384,400 km) away on average.

moon stats

– Radius: 1,079.6 miles (1,737.5 km)

– Diameter: 2,159.2 miles (3,475 km).

– Surface area: 14.6 million square miles (38 million square km)

– Mass: 7.35 x 10^22 kg

– Density: 3.34 grams per cubic centimeter (3.34 g/cm3)

The moon is a bit more than one-quarter (27 percent) the size of Earth, a much larger ratio (1:4) than any other planets and their moons. Earth’s moon is the fifth largest moon in the solar system.

“If Earth were the size of a nickel, the moon would be about as big as a coffee bean,” according to a statement from NASA (opens in new tab).

The moon’s surface area is about 14.6 million square miles (38 million square km), which is less than the total surface area of the continent of Asia (17.2 million square miles or 44.5 million square km).

Related: Does the moon rotate?

### Moon mass, density and gravity

The moon’s mass is 7.35 x 1022 kg, about 1.2% of Earth’s mass. Put another way, Earth weighs 81 times more than the moon. The moon’s density is 3.34 grams per cubic centimeter (3.34 g/cm3). That is about 60% of Earth’s density.

The moon’s gravitational force is only about 16.6 % of Earth’s gravity which means a person would weigh six times less on the moon than they do on Earth. A 45-kilogram person would weigh 100 lbs. on Earth but only 16.6 lbs. on the moon. Long jump events on the lunar surface would certainly be interesting as a person who can jump up 10 feet on Earth would be able to jump almost 60 feet on the moon.

Like most of the solar system worlds, the moon’s gravity varies based on its surface features. In 2012, NASA’s Gravity Recovery and Interior Laboratory (GRAIL) mission (opens in new tab) mapped the moon’s gravity in unprecedented detail.

Did you know?

The moon is the second densest moon in the solar system; Jupiter’s moon Io is denser, with 3.53 g/cm3.

“What this map tells us is that more than any other celestial body we know of, the moon wears its gravity on its sleeve,” GRAIL principal investigator Maria Zuber of the Massachusetts Institute of Technology said in a statement (opens in new tab). “When we see a notable change in the gravity field, we can sync up this change with surface topography features such as craters, rilles or mountains.”

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While the moon is the closest and one of the longest studied astronomical objects, scientists continue to press the celestial body for details.

“The moon is the Rosetta Stone by which we understand the rest of the solar system,” Noah Petro, deputy project scientist for NASA’s Lunar Reconnaissance Orbiter (LRO) mission, said in a statement (opens in new tab)

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### How does our moon compare to others in the solar system?

According to the science education website The Nine Planets (opens in new tab) (they still love Pluto), our moon is the biggest in the solar system relative to the size of its planet, it is the fifth-biggest overall. Jupiter’s moon Ganymede is the largest moon in the solar system.

Swipe to scroll horizontally

10 biggest moons in the solar system
Rank Moon Equatorial radius Parent planet
1 Ganymede 1,635 miles (2,631 km) Jupiter
2 Titan 1,600 miles (2,575 km) 1,600 miles (2,575 km) Saturn
3 Callisto 1,497 miles (2,410.3 km) Jupiter
4 Io 1,131.7 miles (1,821.6 km) Jupiter
5 The moon 1,079.6 miles (1,737.5 km) Earth
6 Europa 969.84 miles (1,560.8 km) Jupiter
7 Triton 840.96 miles (1,353.4 km) Neptune
8 Titania 490.19 miles (788.9 km) Uranus
9 Rhea 474.91 miles (764.3 km) Saturn
10 Oberon 473.11 miles (761.4 km) Uranus

### Supermoon

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Have you ever gazed up and the night sky and thought “why is the moon so big tonight?”. The answer is in the moon’s orbit. Because the moon’s orbit is not circular, it is sometimes closer than at other times. When the moon is closest to Earth — approximately 226,000 miles (363,300 km) –it is known as Perigee, according to an article by NASA (opens in new tab). When a full moon coincides with perigee, we get a supermoon, which appears 14 percent larger and 30 percent brighter than usual.

First applied by astrologer Richard Nolle in 1979, “supermoon” originally referred to a new or full moon that occurs when the moon is within 90 percent of its closest approach to Earth. The astronomical term for the phenomena is a perigee-syzygy moon. According to NASA Jet Propulsion Laboratory “Syzygy is the alignment of three celestial bodies, in this case, the Sun, Moon and Earth. But that doesn’t quite roll off the tongue as easily as supermoon”.

The difference isn’t always obvious; according to NASA, “A 30 percent difference in brightness can be easily masked by clouds or the competing glare of urban lights.”

“The main reason why the orbit of the moon is not a perfect circle is that there are a lot of tidal, or gravitational, forces that are pulling on the moon,” Petro told Space.com, adding that the gravity of the Earth, sun and planets of our solar system all impact the orbit of the moon. “You have all of these different gravitational forces pulling and pushing on the moon, which gives us opportunities to have these close passes.”

A supermoon occurs about every 414 days. That’s an average, however; the year 2016 boasted not one but three supermoons. The moon won’t get as close to Earth as it got during the November 2016 supermoon until November 25, 2034.

### Why does the moon look big when rising or setting near the horizon?

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It’s all an illusion. A little-understood optical effect can make the moon seem bigger when rising behind distant objects on the horizon. This trick of the brain — known either as the moon illusion or the Ponzo illusion — has been observed since ancient times, but still has no generally accepted explanation (opens in new tab), according to NASA.

One theory holds that we’re used to seeing clouds just a few miles above us, while we know that clouds on the horizon can be tens of miles distant. If a cloud on the horizon is the same size as clouds normally are overhead despite its great distance, we know it must be huge. And because the moon near the horizon is the same size as it normally is overhead, our brains automatically tack on a similar size increase.

But not everyone thinks clouds have worked their magic on our brains to such a great extent. One alternative hypothesis holds that the moon seems larger near the horizon because we can compare its size to nearby trees and other objects on Earth — and it looms large in comparison (opens in new tab). Overhead, amid the vast expanse of outer space, the moon seems diminutive.

One way to test whether it’s just an illusion is to hold your thumb up next to the moon and compare the moon’s size with your thumbnail. When the moon is higher in the sky, look at it again; the moon will be the same size compared to your thumbnail.

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Looking for more fast moon facts, these educational infographics by ESA (opens in new tab) have got you covered. Curious to see how much you would weigh on other worlds, this fun interactive activity from the science museum Exploratorium (opens in new tab) will tell you! If you would like to read more about the Ponzo illusion, The Illusion Index (opens in new tab) from the University of Glasgow has a large collection of illusions for you to explore.

### Bibliography

• Lo Presto, Michael C. “How big is the Moon?.” The Physics Teacher (opens in new tab)38.3 (2000): 179-180.
• Rudrauf, David, Daniel Bennequin, and Kenneth Williford. “The moon illusion explained by the projective consciousness model.” (opens in new tab) Journal of Theoretical Biology 507 (2020): 110455.
• Schmidt, Johann Friedrich Julius. “Size and Mass of the Moon.” (opens in new tab) The Moon. Springer, Cham, 2020. 7-7

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Tim Sharp is the Reference Editor for Space.com. He manages articles that explain scientific concepts, describe natural phenomena and define technical terms. Previously, he was a Technology Editor at The New York Times and the Online Editor at the Des Moines Register. He was also a copy editor at several newspapers. Before joining Purch, Tim was a developmental editor at the Hazelden Foundation. He has a journalism degree from the University of Kansas. Follow Tim on Google+ and @therealtimsharp

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### How big is the moon? The size and weight compared to Earth

• Author: space.com

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• Sumary: The moon is a little more than one quarter the size of Earth.

• Matching Result: by D Dobrijevic — The moon is a bit more than one-quarter (27 percent) the size of Earth, a much larger ratio (1:4) than any other planets and their moons.

• Intro: How big is the moon? Home References Science & Astronomy How big is the moon? Relative to Earth, the moon is a little more than one quarter the size of our home planet. (Image credit: CochiseVista via Getty Images) Earth’s moon is the brightest object in our night sky. But…

### How many times bigger is the Earth than the Moon? – Socratic

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• Sumary: This is true, however the Earth is approximately 6 times more massive. We think the Earth-Moon system formed from a collision several billion years ago. The moon took a disproportionately large quantity of the surface of the earth, which is less dense, and the collision left us with…

• Matching Result: Jul 19, 2017 · 1 answer

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### How small is the Moon compared to Earth? – Cool Cosmos

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• Sumary: How small is the Moon compared to Earth?

• Matching Result: The Moon has a diameter of 2,159 miles (3,476 kilometers) and is about one-quarter the size of Earth. The Moon weighs about 80 times less than Earth.

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### The Moon Compared to Earth – Universe Today

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## Frequently Asked Questions About how many times bigger is earth than the moon

If you have questions that need to be answered about the topic how many times bigger is earth than the moon, then this section may help you solve it.

four or so times

### How many times smaller is the moon than Earth?

The size of Earth is 50 times that of the Moon.

### What if Earth were ten times larger?

The iron core and liquid mantle would also be 10 times bigger, and with more gravity acting on a larger mass, the pressure beneath Earth’s surface would increase, if the hypothetical super-Earth were even bigger, say 10 times its current mass.

### Does the Moon have a million times the size of Earth?

Quick Response: The Moon is 27% larger than Earth in surface area and 81 times less massive. The Moon has a surface area of 14.6 million square miles (38 million square kilometers).

### a segment from the YouTube video What If The Moon Were 10x Bigger? | Unveiled

Iframe with a src of “https://www.youtube.com/embed/y3uETanskrQ”

### What if the Moon were one hundred times larger?

Because of how much bigger the Earth is than the moon, about 50 moons could fit inside of its 260 billion cubic mile volume.

### The Moon is 400 times smaller than the Sun, is this true?

The Moon and Sun appear to be roughly the same size in the sky from Earth because, despite being 400 times smaller and 400 times closer to the planet than the Sun, respectively, the Moon is.

### Has a moon ever been lost from a planet?

The lost moon, which they call Chrysalis, may also aid in explaining the development of Saturn’s peculiarly tilted axis of rotation, which they claim occurred about 160 million years ago when its orbit brought it too close to the planet.

### Exists there a super-Earth?

Because they don’t exist in our own solar system, “we currently know as little as possible about super-Earths.” The majority of these enigmatic planets are found when they pass in front of tiny stars and cause the starlight to dim.

### Can the Earth continue to expand?

Cosmologists generally agree that the universe has a flat shape (i.e., parallel lines remain parallel) and will expand indefinitely.

### What would occur if the Moon suddenly vanished?

Without the Moon’s assistance, it is possible that the tilt of the Earth could change dramatically, going from having no tilt (which results in no seasons) to having a large tilt (which results in extreme weather and even ice ages).

### Two moons might exist.

Astronomers have speculated that Earth may have more than one moon for centuries, positing that the moons might be located at five specific points of stability in the universe.

### 4 moons are they visible?

The four largest moons of Jupiter, the largest planet in our solar system, are easily visible with a good pair of binoculars (or a telescope), with three of the four moons larger than the moon of Earth.

### Can people live on without the moon?

Without the moon’s gravitational pull, Earth’s wobble would be much greater over billions of years, causing different regions to experience extreme heat before descending into protracted ice ages. This would be bad for life.

### Can Earth exist without the moon?

Right now, thanks to our moon, our axis stays tilted at 23.5%, but without the moon the earth might tilt too far over or hardly tilt at all leading to no seasons or even extreme seasons. Without the moon the earth’s axis would tilt differently over time, which could lead to some very wild weather.

### What would occur if the sun went down for five seconds?

Though you might imagine that it would suddenly get very cold, our planet has enough heat reserves in its atmosphere and oceans to keep us warm for those five seconds without the Sun.