Sofia Martinez
The American flag is one of the most iconic images from the Apollo 11 mission, with Buzz Aldrin famously photographed saluting the flag on the Moon's surface. Six flags were planted on the Moon during the Apollo program, made from nylon and hung on telescoping staffs. However, due to the extreme conditions on the Moon, with temperatures fluctuating from +400°F during the day to -400°F at night, the flags are likely to have disintegrated. While it is impossible to see the flags using Earth-based telescopes, NASA's Lunar Reconnaissance Orbiter (LRO) has captured images that indicate the Apollo 12, 16, and 17 flags are still intact, while the status of the Apollo 14 and 15 flags is unknown.
| Characteristics | Values |
|---|---|
| Number of flags on the moon | 6 |
| Material | Nylon |
| Size | 3 by 5 feet (0.91 by 1.52 m) |
| Cost | $5.50 |
| Tube cost | $75 |
| Tube material | Anodized aluminum |
| Tube diameter | 1 inch |
| Tube colour | Gold |
| Tube construction | Two telescoping parts |
| Tube height | 28-66 inches (71-170 cm) |
| Flag status | Apollo 11 flag no longer standing; Apollo 12, 16, and 17 flags still intact; Apollo 14 and 15 flags' status unknown |
| Flag condition | Likely bleached white by UV radiation and temperature extremes; may have disintegrated |
| Observability from Earth | Not observable with current Earthbound telescopes; may be observable with space telescopes |
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What You'll Learn
The flags were made of nylon, not plastic
The flags on the moon were made of nylon, not plastic. They were ordinary three-by-five-foot flags, ordered from a government supply catalogue for $5.50 apiece. Nylon survives for a long time at room temperature, but the moon's temperature fluctuates between +400°F during the day and -400°F at night. The flags have also been exposed to unfiltered solar radiation, which has likely bleached them white and rendered the nylon thread brittle.
Photographs taken by the Lunar Reconnaissance Orbiter (LRO) show that the flags left by Apollo 12, 16, and 17 are still standing, but the first flag left by Apollo 11 cannot be seen and is presumed to no longer be standing. The LRO has not captured the Apollo 14 and 15 flags, so their status is unknown.
It is highly unlikely that the Apollo flags could have endured the harsh conditions on the moon, including temperature swings, micrometeorites, radiation, and ultraviolet light. The nylon flags were hung on telescoping staffs and horizontal bars constructed of anodized aluminum tubes. The flags were modified with a stitched hem at the top to accept a horizontal tube, allowing them to be displayed unfurled in the airless environment of the moon.
The decision to plant an American flag on the moon was made rather late in the lead-up to the Apollo 11 mission. The flag has symbolic significance as a gesture of national pride and achievement, but it was not intended to last forever on the moon's surface. The harsh conditions on the moon's surface would naturally disintegrate the flag's material over time.
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The flags were bought from a government catalogue
The flags on the moon were not specially designed for space travel. In fact, they were simple, off-the-shelf flags bought from a government supply catalogue. The flags were made of nylon and measured 3 by 5 feet (0.91 by 1.52 meters). They were modified with a stitched hem at the top to accept a one-inch diameter horizontal tube to keep the flag unfurled, as there is no wind on the Moon.
The decision to plant the American flag on the Moon was made rather late in the lead-up to the Apollo 11 mission. The flag cost $5.50, and the tubing used to keep it unfurled cost $75. Six flags were planted on the Moon, with the last one being slightly larger at 6 feet wide.
Due to the extreme conditions on the Moon, with temperatures fluctuating between +400°F and -400°F, it is unlikely that the flags are still intact. The intense solar radiation and temperature extremes have likely bleached the flags white and made the nylon thread very brittle. The flags may have disintegrated, and even if they are still there, they are probably in rough shape.
The Lunar Reconnaissance Orbiter (LRO) has captured images of the flags left by Apollo 12, 16, and 17, which appear to still be standing. However, the status of the Apollo 14 and 15 flags cannot be determined conclusively. The LRO has not yet captured the shadows of these flags, so their current condition remains unknown.
Despite the uncertainty surrounding the condition of the flags, they remain a powerful symbol of national pride and achievement. The images captured by the LRO provide valuable insights into the durability of materials in the harsh conditions of the Moon, which can inform future space exploration and the design of more resilient flags and other objects.
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The flags were modified to include a horizontal bar
The flags on the moon were modified to include a horizontal bar to make them appear as if they were flying. As there is no wind on the Moon, the flags would not move without this alteration. Jack Kinzler, head of technical services at the Manned Spacecraft Center (MSC) in Houston, Texas, was responsible for designing the Lunar Flag Assembly (LFA).
Kinzler's design involved inserting a horizontal pole through a hemmed pocket at the top of the flag. The flags were ordinary three-by-five-foot nylon flags ordered from a government supply catalogue for $5.50 each. The horizontal poles were constructed from one-inch anodized aluminum tubes in two telescoping parts, with a gold color. The total height of the flagpoles was limited to between 28 and 66 inches due to the constraints of the astronauts' spacesuits.
The flags were placed on the outside of the Apollo Lunar Module, typically on the descent ladder inside a thermally insulated tubular case. This was to protect them from exhaust gas temperatures that could reach 2,000 °F (1,090 °C). Six flags were planted on the Moon, with a seventh flag for Apollo 13 that was not planted due to a spacecraft malfunction.
Over time, the flags have likely been bleached white by the intense UV radiation and extreme temperature variations on the Moon. The nylon material has probably become brittle and may have disintegrated. However, images from the Lunar Reconnaissance Orbiter (LRO) show that the flags from Apollo 12, 16, and 17 are still standing, while the status of the Apollo 14 and 15 flags is unknown.
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The flags are no longer visible from Earth
The flags planted on the Moon during the Apollo missions are no longer visible from Earth. Six flags were planted in total, and while they were made of nylon, the harsh conditions on the Moon have likely caused them to disintegrate. The Moon's surface experiences extreme temperature fluctuations, with searing sunlight and heat of up to 100° C during the two-week-long lunar day, followed by two weeks of frigid -150° C darkness during the lunar night.
Additionally, the nylon flags have been subjected to intense unfiltered solar radiation, including ultraviolet (UV) light, which has likely bleached them white and rendered the nylon threads brittle. The combination of extreme temperatures, solar radiation, and micrometeorite impacts has likely destroyed the flags over time. While the Lunar Reconnaissance Orbiter (LRO) has captured images of the Apollo landing sites, it has only positively confirmed the continued presence of the Apollo 12, 16, and 17 flags. The status of the Apollo 14 and 15 flags is less clear, as their shadows have not been identified in LRO images, suggesting they may have suffered damage or disintegrated.
The largest of the American flags on the Moon, planted by Apollo 17, spans six feet when unfurled. At this size and at the distance of the Moon, even the most powerful telescopes on Earth cannot resolve the flags. To barely make out the Apollo 17 flag, a telescope would need an aperture of over 120 meters, and to identify it clearly, a telescope with an aperture of over 1.2 kilometers would likely be required. Such telescopes do not currently exist.
While the flags on the Moon may no longer be visible or intact, they were never intended to last. Historian Anne Platoff notes that "it wasn't the intention for the flag material itself to last. It was just to be there during the event - the landing and departing from the moon." The flags were ordinary nylon flags ordered from a government supply catalog, modified only by sewing a hem at the top to accept a horizontal tube for display. The flags were chosen to be symbolic gestures of national pride and achievement rather than designed for durability in the harsh lunar environment.
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The flags have likely disintegrated
The flags on the moon were made of nylon. While nylon is durable at room temperature, the moon's extreme temperatures, UV radiation, and micrometeorites would have disintegrated the flags over time. The flags have likely faded to white and become brittle, and they may have already turned to dust.
The Lunar Reconnaissance Orbiter (LRO) has taken images of the flags on the moon. While the LRO has positively confirmed that the Apollo 12, 16, and 17 flags are still erect, the Apollo 11 flag cannot be seen and is presumed no longer standing. The Apollo 14 and 15 flags have not been captured by the LRO, so their status remains unknown.
The largest of the American flags on the moon is the one left by Apollo 17, spanning six feet when unfurled. However, even the most powerful telescopes on Earth cannot resolve targets of this size on the lunar surface. Therefore, it is not possible to visually confirm the status of the flags using Earth-based telescopes.
The flags were not designed to withstand the harsh conditions on the moon indefinitely. Historian Anne Platoff notes that "it wasn't the intention for the flag material itself to last. It was just to be there during the event - the landing and departing from the moon." The flags were ordinary nylon flags ordered from a government supply catalog and modified with a stitched hem to accept a horizontal tube for display.
Given the extreme conditions on the moon, it is highly unlikely that the flags have survived intact. The combination of searing sunlight, extreme temperature swings, unfiltered UV radiation, and micrometeorite impacts would have degraded the nylon material over time. Therefore, it is reasonable to assume that the flags have disintegrated, and only their shadows remain.
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Frequently asked questions
No, the flag on the moon is not made of plastic. It is made of nylon.
There are a total of 6 flags on the moon.
The flags have likely faded to solid white and will disintegrate over time due to the extreme temperature and UV conditions on the moon. The Lunar Reconnaissance Orbiter (LRO) has captured images of the Apollo 12, 16, and 17 flags still standing, while the status of the Apollo 14 and 15 flags is unknown.
The flags on the moon are too small to be seen from Earth, even with the most powerful telescopes. The largest of the flags on the moon spans six feet when unfurled, and it would require a telescope with an aperture of over 120 meters to barely see it as a random dot.
The decision to plant the American flag on the moon was made as a symbolic gesture of national pride and achievement. It was inspired by President John F. Kennedy's plan to explore new worlds and share the adventure with other nations.
