# How big is the moon?

How big is the moon ? proportional to Earth, the daydream is a little more than one one-fourth the size of our home planet. earth ‘s lunar month is the brightest object in our night flip. But how adult is the moon ? The moon ‘s entail radius is 1,079.6 miles ( 1,737.5 kilometers ) and the mean diameter is 2,159.2 miles ( 3,475 kilometer ). Compared to Earth, the moon is less than a third the width of our home planet, according to NASA ( opens in new tab key ). The daydream ‘s equatorial circumference is 6,783.5 miles ( 10,917 kilometer ). At first gear, the daydream may appear quite boastfully, but that is only because it is our close celestial consistency — approximately 238,855 miles ( 384,400 kilometer ) away on average.

moon stats – Radius: 1,079.6 miles ( 1,737.5 kilometer ) – Diameter: 2,159.2 miles ( 3,475 kilometer ). – Surface area: 14.6 million public square miles ( 38 million square kilometer ) – Mass: 7.35 ten 10^22 kilogram – Density: 3.34 grams per cubic centimeter ( 3.34 g/cm3 ) The moon is a bite more than one-fourth ( 27 percentage ) the size of Earth, a a lot larger proportion ( 1:4 ) than any other planets and their moons. earth ‘s moon is the one-fifth largest lunar month in the solar system. “ If Earth were the size of a nickel, the moonlight would be about american samoa adult as a coffee attic, ” according to a statement from NASA ( opens in new check ). The moonlight ‘s open area is about 14.6 million square miles ( 38 million square kilometer ), which is less than the total surface area of the celibate of Asia ( 17.2 million square miles or 44.5 million square kilometer ). Related: Does the moon rotate ?

### Moon mass, density and graveness

The moon ‘s aggregate is 7.35 x 1022 kilogram, about 1.2 % of Earth ‘s mass. Put another way, Earth weighs 81 times more than the daydream. The daydream ‘s concentration is 3.34 grams per cubic centimeter ( 3.34 g/cm3 ). That is about 60 % of Earth ‘s concentration. The moonlight ‘s gravitational force is merely 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 pound. on earth but alone 16.6 lbs. on the daydream. Long leap events on the lunar surface would surely be interesting as a person who can jump up 10 feet on Earth would be able to jump about 60 feet on the lunar month. Like most of the solar organization 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 dense 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 torso 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 instruction ( opens in raw tab ). “ When we see a luminary deepen in the gravity field, we can sync up this change with surface topography features such as craters, rilles or mountains. ” While the moon is the closest and one of the longest studied astronomic objects, scientists continue to press the celestial body for details. “ The moonlight is the Rosetta Stone by which we understand the rest of the solar arrangement, ” Noah Petro, deputy project scientist for NASA ‘s Lunar Reconnaissance Orbiter ( LRO ) deputation, said in a statement ( opens in newly yellow journalism ).

The moon is a short more than one quarter the size of Earth. The deep Space Climate Observatory satellite captured the moon and Earth together as the scope of the satellite crosses the orbital plane of the moon. ( persona credit : NASA/NOAA ) ( opens in new tab key )

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

According to the skill education website The Nine Planets ( opens in newfangled tab ) ( they placid love Pluto ), our daydream is the biggest in the solar system relative to the size of its satellite, it is the fifth-biggest overall. Jupiter ‘s lunar month Ganymede is the largest daydream in the solar organization. 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

A supermoon rises over Washington on Dec, 3. 2017. ( double citation : NASA/Bill Ingalls ) ( opens in raw check ) Have you ever gazed up and the night flip and thought “ why is the daydream indeed big tonight ? ”. The suffice is in the lunar month ‘s orbit. Because the lunar month ‘s sphere is not circular, it is sometimes closer than at other times. When the daydream is closest to Earth — approximately 226,000 miles ( 363,300 kilometer ) –it is known as Perigee, according to an article by NASA ( opens in raw check ). When a full moon coincides with perigee, we get a supermoon, which appears 14 percentage larger and 30 percentage bright than usual. first applied by astrologer Richard Nolle in 1979, “ supermoon ” in the first place referred to a new or full moon that occurs when the moon is within 90 percentage of its closest approach to Earth. The astronomic term for the phenomenon is a perigee-syzygy daydream. According to NASA Jet Propulsion Laboratory “ Syzygy is the alignment of three celestial bodies, in this case, the Sun, Moon and Earth. But that does n’t quite roll off the tongue equally easily as supermoon ”. The dispute is n’t always obvious ; according to NASA, “ A 30 percentage remainder in luminosity can be easily masked by clouds or the competing glare of urban lights. ” “ The main reason why the sphere of the moon is not a arrant set is that there are a distribute of tidal, or gravitational, forces that are pulling on the moon, ” Petro told Space.com, adding that the graveness of the Earth, sun and planets of our solar system all impact the orb of the moon. “ You have all of these unlike gravitational forces pulling and pushing on the moon, which gives us opportunities to have these near passes. ” A supermoon occurs about every 414 days. That ‘s an average, however ; the year 2016 boasted not one but three supermoons. The moon wo n’t get a close to Earth as it got during the November 2016 supermoon until November 25, 2034 .

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

sometimes the daydream can look particularly big when rising or setting near the horizon. This image shows a stun supermoon rising up from behind the Cerro Armazones batch in Chile. ( image credit rating : G.Hüdepohl ( atacamaphoto.com ) /ESO ) ( opens in newly check ) It ‘s all an illusion. A little-understood ocular effect can make the moon seem bigger when rising behind aloof 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 by and large accepted explanation ( opens in new yellow journalism ), 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 big distance, we know it must be huge. And because the lunar month near the horizon is the lapp size as it normally is overhead, our brains mechanically tack on a like size increase.

But not everyone thinks clouds have worked their magic on our brains to such a great extent. One option guess holds that the daydream seems larger near the horizon because we can compare its size to nearby trees and other objects on Earth — and it looms boastfully in comparison ( opens in newfangled yellow journalism ). Overhead, amid the huge sweep of out space, the moon seems diminutive. One way to test whether it ‘s just an delusion is to hold your flick up adjacent to the moonlight and compare the daydream ‘s size with your thumbnail. When the moon is higher in the flip, look at it again ; the moon will be the same size compared to your thumbnail .

### extra resources

Looking for more fast daydream facts, these educational infographics by ESA ( opens in modern pill ) have got you covered. curious to see how a lot you would weigh on early worlds, this playfulness synergistic activeness from the science museum Exploratorium ( opens in new tab key ) will tell you ! If you would like to read more about the Ponzo delusion, The Illusion Index ( opens in new check ) from the University of Glasgow has a large collection of illusions for you to explore .

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