What Color Is the Moon

Short answer

• The Moon itself is brownish gray: the color of its dusty surface, called regolith, seen without Earth's atmosphere in the way. The dark plains are a darker gray, the bright highlands a lighter gray, and the whole surface sits in a narrow range of reddish gray tones. That short answer does not match what most people see. From Earth, the Moon often looks white or silvery, sometimes yellow or orange near the horizon, red during a total lunar eclipse, and, very rarely, blue. None of those changes means the Moon has changed color. They happen because Earth's atmosphere filters sunlight on its way to the Moon or to your eyes, or because your eyes judge brightness against a black sky. So two questions hide inside "what color is the moon": what the surface is made of and what color that material is, and why the Moon looks different on different nights. This article answers both, in that order.

Two Questions, Not One

Color is not a property stamped on an object. It is the result of light hitting a surface, some of that light bouncing back, and an eye or a camera reading what comes back. Change the light, the path, or the background, and the same surface can look different. The Moon is a perfect example because all three changes happen to it.

First, the light changes. The Moon makes no light of its own. Everything we call moonlight is sunlight reflected off the lunar surface, and that reflected light passes through Earth’s atmosphere before it reaches us, with the atmosphere editing it. Second, the path changes. When the Moon is high, its light takes a short path through the atmosphere. Near the horizon, it takes a much longer path through much more air, and more of that light gets scattered away. Third, the background changes. Against a black night sky, even a fairly dark surface looks bright, while the same surface next to a bright landscape can look dull and dark.

Keep those three effects in mind. The surface stays brownish gray throughout. The sky, the angle, and your eyes do the rest.

The Surface Itself: Brownish Gray Rock Dust

The Moon’s surface is covered by regolith, a layer of broken rock and fine dust built up over billions of years of meteorite impacts. There is no wind, rain, or plant life to soften it, and no thick atmosphere to weather rock the way Earth weathers rock. The result is a landscape of gray dust, scattered rocks, craters, and two main kinds of terrain: the bright highlands, made mostly of pale rock rich in plagioclase, a calcium and aluminum rich silicate mineral that is gray in color, and the dark patches visible to the naked eye, the maria, the Latin word for seas, although they hold no water. The maria are large plains of darker volcanic rock, basalt, laid down by ancient lava flows. They are darker than the highlands, but they are still gray, not black and not blue.

Lunar scientist Paul Spudis, writing in Smithsonian Magazine, summed up the true color this way: the true color of the Moon is a brownish, that is reddish, gray, but overall the surface is fairly neutral in tone. “Brownish gray” is not a strong brown like garden soil. It is gray with a slight warm lean, noticeable mainly when you compare two samples side by side. If Earth had no atmosphere, no oceans, and no life, Spudis noted, it too would be largely brownish gray, since its crust holds much the same silicate and oxide minerals as the Moon. Weathering by air and water, plus biological activity, makes Earth’s surface so colorful. The Moon, with none of those processes, shows the plain color of rocky planet crust.

The Apollo astronauts saw this at close range. During Apollo 8, the first mission to orbit the Moon, Jim Lovell described the Moon as basically gray, with no color. The Apollo 10 crew saw brownish hues from bright tan to dark chocolate brown, and Apollo 11 astronaut Buzz Aldrin saw interesting colors within some rocks, mentioning purple rocks during the surface walk. None of this contradicts the brownish gray answer. It refines it: mostly gray, with small local patches leaning brown, tan, or purple when you look closely.

Small Patches of Real Color

If the Moon were one flat gray, this article would be short. It is not. Up close, the surface holds small, genuine colors, and they tell geologists what the rocks are made of. Three Apollo finds make the point.

During Apollo 15, the crew caught a fleeting glimpse of green on the surface. The green was still there when they raised their helmet visors, and the material was still green when brought back to Earth. It was volcanic glass, erupted from deep inside the Moon under high pressure. Study of Apollo samples has found glass fragments in almost every color in the spectrum, from red to yellow and brown, in addition to the green and orange examples here.

During Apollo 17, the crew found orange soil at Shorty crater, also volcanic glass, made of tiny beads erupted from great depth. It is orange, rather than green like the Apollo 15 glass, because of its relatively high titanium content, and it was mixed with black glass beads of identical composition that had partly crystallized.

A third kind of color difference is visible from orbit and in telescopes, once you know where to look. The dark plain called Mare Tranquillitatis, on the eastern near side, is noticeably darker and more bluish gray than the dark mare plains just to the north in Mare Serenitatis. In lunar science, “blue” here does not mean sky blue. It means bluer, or less reddish, than comparable mare deposits elsewhere on the Moon. The blue units in the maria are lavas rich in ilmenite, an iron and titanium oxide, and high titanium lavas come from those blue regions.

So the honest summary is layered: gray at a glance, brownish gray on closer inspection, and at fine scale small patches of green, orange, brown, and purple tinted material, plus broad mare units leaning slightly blue or slightly red relative to each other. All of those differences are subtle. Spudis notes that color differences on the Moon are typically less than about one percent, which is why mapping lava flow boundaries requires image processing. Your eye alone, from Earth, will almost never pick them out.

Why a Dark Surface Looks So Bright

Here is the second surprise. The Moon is not only gray, it is dark gray. The commonly quoted geometric albedo of the Moon, the fraction of light reflected in the visible spectrum, is about 0.12, meaning about 12 percent of the light is reflected and the rest is absorbed. Other ways of measuring give lower figures, in the range of about 7 to 11 percent, because the Moon does not reflect light evenly in every direction. Whichever measure you use, the conclusion is the same: the Moon is a dark object, roughly comparable to worn asphalt or coal, not to fresh snow or white paper.

Then why does it blaze in the night sky? Three reasons work together. First, the Sun is extremely bright, so even 12 percent of direct sunlight is a lot of light, and the full Moon is the brightest object in the night sky by a wide margin. Second, the background is black. Your visual system judges brightness by contrast, not by absolute measurement, so a dark gray disc against total darkness looks brilliant, and Spudis notes that the Moon dazzles the eye when first looked at, whether with the naked eye or through a telescope. Third, the Moon is close, so its reflected light does not have far to travel. A dark surface nearby can easily outshine a bright surface far away.

This contrast effect also explains why Moon photographs differ: one exposed for the bright lunar surface shows gray tones and a black sky, while one exposed for a dark landscape in the foreground washes the Moon out to white. Neither is lying. Each shows the same dark gray surface under different exposure choices.

Why the Moon Looks White or Silvery

On most clear nights, when the Moon is well above the horizon, it looks white, silver, or pale gray to the naked eye: the combined effect of a gray surface, bright sunlight, a black background, and an eye that adapts to darkness. There is no separate physical process that turns the Moon white at night. The whiteness is mostly perception. The surface reflects all visible wavelengths of sunlight in roughly similar amounts, which is what gray means, and your eye reads that even, bright reflection against black sky as white or silver. The exact word you choose says more about the lighting and your eyes than about the rock.

Phase does not change the surface color either. A crescent Moon, a half Moon, and a full Moon all show the same gray material. What changes is how much of the sunlit surface faces Earth, and how bright the whole disc appears. A full Moon looks much brighter than a crescent, not because its rock got lighter, but because the Sun shines straight onto the face we see and the light bounces more directly back toward us.

Why the Moon Turns Yellow, Orange, or Red Near the Horizon

The most common color change happens every month, and anyone can watch it. When the Moon is low in the sky, near moonrise or moonset, it often looks yellow, golden, orange, or even red. As it climbs higher, it fades back to white or pale gray. The Moon has not changed. The amount of atmosphere its light passes through has.

The process is called Rayleigh scattering, named for the physicist Lord Rayleigh. Sunlight, and therefore moonlight, holds many wavelengths. Short wavelengths, at the blue and violet end of the spectrum, are scattered much more strongly by air molecules than long wavelengths, at the red and orange end. When the Moon is overhead, its light passes through a relatively short column of air, so most wavelengths still reach your eyes in similar amounts, and the Moon looks pale. Near the horizon, its light must travel through a much thicker slice of atmosphere, and on that long journey most of the blue light is scattered away before it reaches you. What is left over is richer in yellow, orange, and red light, so the Moon takes on a warm tint. This is the same reason the Sun looks yellow at noon and orange or red at sunset, and NASA makes the same connection in its lunar eclipse guide: blue light scatters widely in air, redder light travels a straighter path, and we see that redder light spread across the sky at sunrise and sunset.

Dust, smoke, and pollution strengthen the effect. On a hazy evening, the low Moon can look deeply orange or red, while on a crisp, clean night it may look only faintly yellow. None of this is a change in the Moon. It is a change in the filter between the Moon and you.

The Blood Moon: Red During a Total Lunar Eclipse

During a total lunar eclipse, the Moon can turn deep red, copper, or rust colored, a sight often called a blood moon. This is the most dramatic Moon color most people will ever see, and it is also the easiest to misunderstand. The Moon is not glowing red on its own. It is being lit by Earth’s sunrises and sunsets.

A lunar eclipse happens when the Sun, Earth, and Moon line up with Earth in the middle, blocking direct sunlight from the full Moon. If Earth had no atmosphere, the eclipsed Moon would go almost completely dark, but Earth’s atmosphere bends and filters some sunlight around the edge of the planet and into Earth’s shadow.

NASA describes the result in plain terms. During a lunar eclipse, some heavily filtered morning and evening light makes it all the way through Earth’s atmosphere and reaches the lunar surface, dimly lighting it with red orange light left over from all the sunsets and sunrises happening around the world at that time. Blue light has been scattered away on the way, so only the longer red and orange wavelengths survive. It is, in NASA’s image, as if all the world’s sunrises and sunsets are projected onto the Moon at once.

The exact shade varies from one eclipse to the next. NASA notes that the more dust or clouds in Earth’s atmosphere during the eclipse, the redder the Moon will appear: a very clean atmosphere gives a brighter, more orange eclipse, while a dusty atmosphere, for example after a large volcanic eruption, gives a darker, deeper red eclipse, or in extreme cases a Moon so dark it nearly vanishes in the shadow. The surface underneath is still brownish gray, and the light falling on it during totality is red, so the gray surface reflects red light back to Earth.

Two confusions are worth clearing up. A blood moon is not a different kind of Moon, only an ordinary full Moon seen during a total lunar eclipse, lit by filtered sunlight. And a lunar eclipse is safe to watch with the naked eye: unlike a solar eclipse, you are looking at reflected sunlight off a dark surface, not staring at the Sun itself.

The Blue Moon: A Calendar Name, Not a Color

“Once in a blue moon” sounds like a description of color, but in its usual meaning it is not. A monthly blue moon is the second full Moon in a single calendar month. It happens because the cycle from one full Moon to the next is about 29.5 days, slightly shorter than the average calendar month, so occasionally two full Moons fit into one month. NASA puts the frequency at every two to three years for the monthly kind. There is also a seasonal blue moon: the third full Moon in a season that has four full Moons instead of the usual three. NASA is clear on the key point for both kinds: a blue moon will not look blue. The name refers to timing, not color, and a calendrical blue moon looks pale gray and white, just like the Moon on any other night.

Very rarely, the Moon genuinely does look blue, and the cause is again Earth’s atmosphere, not the Moon. NASA explains that tiny particles in the air, typically smoke or dust, can scatter away red wavelengths of light, causing the Moon to appear blue. In its blog on the October 2020 blue moon, NASA gives the famous example of the Krakatoa eruption in 1883. Ash particles from that eruption, many about 1 micron in size, scattered red light and acted as a blue filter, so blue tinted Moons appeared for years after the eruption. NASA adds a rule of thumb: to make a bluish Moon, dust or ash particles must be larger than about 0.6 microns, which is the wavelength of red light. Large wildfire smoke can do the same thing on a smaller scale.

That is the opposite of the normal horizon effect. Normally, small air molecules scatter blue light away and leave red. When the air is full of larger particles of just the right size, those particles scatter red light away instead, and blue gets through. Both effects are atmospheric filtering, and neither changes the Moon’s surface. So the next blue moon will be gray, unless the atmosphere happens to be full of unusual dust or smoke that night.

False Color Images: Beautiful, But Not What Your Eye Sees

Search for Moon color images online and you will find spectacular pictures in vivid blue, orange, and red. Many of those images are real data, but they are not true color photographs. Lunar scientists routinely work with “false color” composite images, where color variations are stretched to extreme degrees to exaggerate differences and make them easier to study.

Spudis explains the practice directly. Color differences on the Moon are extremely subtle, so scientists stretch them in processing to map the boundaries of individual lava flows. The typical false color version of the near side shows brilliantly colored blue and red maria, but those colors do not match what the eye sees, and the color units do not even coincide with mare and highland boundaries. Different color units in the maria represent lava flows of differing composition, with titanium rich lavas in the blue regions.

That does not make false color images fake. They are a visualization tool, like a heat map, revealing real composition differences that would otherwise stay invisible. But they must not be read as photographs: a false color Moon is a data map wearing color as a label, while a true color photograph, correctly exposed, shows a gray disc with faint warm and cool patches. The same caution applies to heavily edited social media photographs, where raising saturation pulls faint tints up into strong colors never visible to the eye. If a Moon photograph looks like a rainbow, check whether the caption says false color or enhanced color.

Supermoons, Harvest Moons, and Size

Two popular Moon labels are often mixed up with color, so they are worth separating here.

A supermoon is a full Moon that happens at or near perigee, the point in its orbit closest to Earth. Because the full Moon is a little closer than usual, it appears especially large and bright. NASA notes that a Moon at perigee can look up to 14 percent bigger than a Moon at apogee, its farthest point, a difference similar to that between a quarter and a nickel, but that you probably will not notice a big difference in size. Nothing in the supermoon definition changes the Moon’s color. A supermoon is the same brownish gray surface, seen slightly closer and slightly brighter.

A harvest moon is the full Moon closest to the autumnal equinox, the first day of fall, named from farming tradition, when the bright Moon gave extra light for gathering crops in the evening. A harvest moon can look orange, but only for the usual horizon reason: in autumn, the full Moon rises soon after sunset and stays low for a while, so its light travels through a long stretch of atmosphere and picks up a warm tint. The name does not mean the Moon itself turns orange in autumn, and the same logic covers a hunter’s moon and any other traditional Moon name, which describe timing, farming, or hunting, not a change in the rock.

How to See the Colors for Yourself

You do not need expensive equipment to check most of this article. Start at moonrise and watch the Moon as it climbs. Note the warm yellow or orange tint near the horizon, then watch it fade toward pale gray or white as the Moon rises. That single observation demonstrates Rayleigh scattering more clearly than any diagram.

On a clear night when the Moon is high, look at the dark patches with binoculars. The maria will stand out as darker gray areas, and you may notice that some look slightly cooler or warmer than others. Do not expect strong blue or red, only faint differences in gray.

During a total lunar eclipse, watch the whole event if you can. The Moon will darken, then take on a copper or red glow, often uneven, and the shade tells you about Earth’s atmosphere that night, not the Moon’s surface: bright orange suggests cleaner air, while dark, deep red suggests dustier air.

Common Mistakes to Avoid

First, do not say the Moon is white as if that were its surface color. White is how it often looks from Earth, against a black sky. Its surface is brownish gray. Second, do not say the Moon changes color. The surface stays the same; Earth’s atmosphere, the Moon’s height in the sky, and the lighting change how it looks. Third, do not read false color images as photographs. False color stretches tiny differences into vivid colors to reveal composition, not appearance. Fourth, do not assume a blue moon will be blue. The name is about calendar timing, while a genuinely blue looking Moon is a rare atmospheric effect. Fifth, do not assume a blood moon is a different Moon. It is an ordinary full Moon during a total lunar eclipse, lit by filtered sunlight. Sixth, do not assume a supermoon changes color. A supermoon is closer and brighter, not a different shade. Seventh, do not judge brightness as proof of a pale surface. The Moon is dark, reflecting only about 12 percent of sunlight by the common geometric albedo measure, and it looks bright because the Sun is bright, the sky is black, and the Moon is close.

Frequently Asked Questions

What color is the Moon really?

Brownish gray. The dusty surface, made mostly of gray plagioclase rich rock in the highlands and darker basalt in the maria, is gray with a slight warm, reddish lean. From space, without Earth’s atmosphere in the way, that is the color you would see.

Why does the Moon look white?

It looks white or silvery because it is bright against a black night sky. The surface reflects sunlight fairly evenly across visible wavelengths, which reads as gray, and your visual system judges that bright gray disc against darkness as white or silver. The surface itself is dark gray, not white.

Why does the Moon look yellow or orange?

Near the horizon, its light travels through a much thicker layer of atmosphere than when it is overhead. Blue light is scattered away on that long path, leaving yellow, orange, and red light to reach your eyes. As the Moon climbs higher, it fades back to pale gray or white.

Why does the Moon turn red during a lunar eclipse?

Earth blocks direct sunlight from the Moon, but some sunlight passes through Earth’s atmosphere around the edge of the planet and into Earth’s shadow. That light has been filtered so blue wavelengths are scattered away and red and orange wavelengths survive, lighting the eclipsed Moon with red orange light, as if all the world’s sunrises and sunsets were projected onto it at once. More dust or cloud makes the red deeper.

Is a blue moon actually blue?

No, not in its usual meaning. A monthly blue moon is the second full Moon in a calendar month, and a seasonal blue moon is the third full Moon in a season with four. Both look like an ordinary pale gray Moon. Very rarely, dust or smoke particles of a particular size can scatter red light away and make the Moon genuinely look blue, as happened for years after the Krakatoa eruption in 1883, but that is a separate atmospheric effect, not what the calendar name means.

Does the Moon make its own light?

No. The Moon shines only by reflecting sunlight, which is why its appearance depends so much on the Sun, on Earth’s atmosphere, and on the angle of the light.

What are the dark patches on the Moon?

The dark patches are the maria, large plains of darker volcanic basalt from ancient lava flows. They look dark compared with the bright highlands, but they are still gray, and the contrast between the two is what gives the face of the Moon its familiar pattern.

Can you see the Moon’s real colors with a telescope?

You can see faint differences between mare units, some slightly cooler or warmer than others, but not strong colors. The real differences are less than about one percent in most places, which is why scientists use false color processing. A telescope shows gray tones, crater detail, and maria highland contrast far more clearly than color.

Keep reading: Does the Moon Have an Atmosphere

Sources & references

• National Aeronautics and Space Administration, Science, "Super Blood Moon: Your Questions Answered," published 18 May 2021, updated 27 November 2024. Lunar eclipse definition and filtered light giving the Moon a deep rosy glow; why the Moon turns red during a lunar eclipse, with blue and violet light scattering more widely than red and orange light, red orange light from sunsets and sunrises around the world reaching the lunar surface, and more dust or clouds making the Moon redder.
• National Aeronautics and Space Administration, Science, "Super Blue Moons: Your Questions Answered," updated 21 October 2024. Monthly blue moon as the second full Moon in a single month, with the Moon's cycle at 29.5 days, happening every two to three years; seasonal blue moon as the third full Moon in a season with four; a blue moon will not look blue; rare blue appearance from tiny smoke or dust particles scattering away red wavelengths; supermoon up to 14 percent bigger at perigee than apogee.
• National Aeronautics and Space Administration, blogs, "'Once in a Blue Moon' Coming Soon," by Lauren Lambert, 23 October 2020. Blue moon as a second full Moon in a calendar month, occurring every two to three years, with nothing to do with a blue hue; genuinely blue tinted Moons from particles thrown into the atmosphere, including the Krakatoa eruption in 1883, with ash particles about 1 micron in size scattering red light and acting as a blue filter, and blue Moons appearing for years after; particles larger than about 0.6 microns needed for a bluish Moon.
• Paul D. Spudis, Smithsonian Magazine, "Once in a Blue Moon," 10 October 2012, updated 17 November 2013. Apollo crew observations, including Apollo 8, Apollo 10, Apollo 11, Apollo 15 green volcanic glass, and Apollo 17 orange soil at Shorty crater; most returned samples gray from very dark charcoal to light almost white gray; olivine and ilmenite as sources of green, brownish yellow, and bluish black tints; Mare Tranquillitatis as darker and more bluish gray than Mare Serenitatis; false color composites stretching subtle differences; color differences typically less than about one percent; the true color of the Moon as brownish, that is reddish, gray, fairly neutral in tone, with plagioclase as the dominant mineral in the lunar crust.
• Scientific American, "The Dirtiest Lunar Mystery of All," on lunar albedo. Lunar albedo about 0.12 in the visible spectrum, reflecting about 12 percent of the light hitting it. Used in this article only for the commonly quoted geometric albedo figure, with the article's own qualification that other measures give lower figures.