THE CLAIM / THE FLAG
Why does a flag ripple where there is no wind?
RECORD / AT A GLANCE
FALSE
The flag hung from a horizontal rod that did not fully extend, leaving ripples. It moved only when the astronauts twisted the pole, then stopped. Tests in a NASA vacuum chamber reproduced this.
THE EVENTS / THE CLAIM / THE RECORD
20 July 1969
Armstrong and Aldrin struggle to push the pole into the hard soil.
2001
The Fox special presents the “waving” flag as evidence of air.
August 2008
The team moves a replica flag in a NASA vacuum chamber.
READ THE FILE
Cloth only ripples like that in moving air.
A rod, a stuck telescope and a pole that was twisted.
Open an article for its evidence, labeled AI assessment and numbered sources. Read the complete static edition ↗
WHAT PEOPLE SAY ABOUT THIS FILE
3 claims people make about this file, each rated documented, partly true, disputed, unproven or false. Think a rating is wrong? Use Dispute or Support, or join the Discussion.
NASA added a crossbar to hold it out in vacuum.
Who says it: NASA records.
LRO images show flag shadows at later sites; Aldrin saw Apollo 11’s blown over at liftoff.
Who says it: LROC team.
It moved only while being handled; a rod held it out, and it then stayed still.
Who says it: Kaysing, Fox 2001.
WATCH THE ORIGINAL
NASA · The Apollo 11 flag sequence. Watch the pole and the hands: the cloth moves when the astronauts move it.
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OPEN THE RECORD
Numbered citations in each article identify the relevant sources. These records have different purposes and evidentiary weight.
Primary institutional record. Carried from the first edition and re-listed 23 October 2026; cited for the specific point in the text.
Primary institutional record. Carried from the first edition and re-listed 23 October 2026; cited for the specific point in the text.
Primary institutional record. Carried from the first edition and re-listed 23 October 2026; cited for the specific point in the text.
Report on the 2008 episode’s vacuum-chamber, reduced-gravity and laser tests.
Russian state news agency interview with the first spacewalker, who trained for the Soviet Moon program. Original Russian; our translation.
Primary institutional record. Carried from the first edition and re-listed 23 October 2026; cited for the specific point in the text.
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Cloth only ripples like that in moving air.
In the still photos the flag is not hanging limp; it is spread out with waves in it. In the film it swings back and forth as the astronauts plant it. On Earth those are the signs of wind, and a sealed studio with air-conditioning would produce exactly that. [1]
Primary institutional record. Carried from the first edition and re-listed 23 October 2026; cited for the specific point in the text.
A rod, a stuck telescope and a pole that was twisted.
NASA knew a flag would hang limp in a vacuum, so the design added a horizontal telescoping rod along the top. On Apollo 11 the rod did not fully extend, which left the nylon bunched in ripples. The crews later liked the look and left it that way. [1][2]
The flag moves only when the astronauts are touching or twisting the pole. Without air to damp it, the swing lasts a little longer than on Earth, then stops. Watch the full sequence, not a cropped clip, and you see the motion begin and end with the astronauts’ hands. [3]
In 2008 the MythBusters team took a replica flag into a NASA vacuum chamber at Marshall Space Flight Center and twisted it. It moved the same way. [4] Even Soviet cosmonaut Alexei Leonov explained the effect this way in 2009. [5]
Primary institutional record. Carried from the first edition and re-listed 23 October 2026; cited for the specific point in the text.
Primary institutional record. Carried from the first edition and re-listed 23 October 2026; cited for the specific point in the text.
Primary institutional record. Carried from the first edition and re-listed 23 October 2026; cited for the specific point in the text.
Report on the 2008 episode’s vacuum-chamber, reduced-gravity and laser tests.
Russian state news agency interview with the first spacewalker, who trained for the Soviet Moon program. Original Russian; our translation.
Approved reader comments and ratings appear here when JavaScript is on.