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September 11 in spaceflight
Wikipedia records 7 spaceflight and astronomy events on September 11. Below are the pictures NASA published on September 11 in 5 different years — each one taken or released on this exact date.
Recorded events
IN THE RECORD7ENTRIES
Spaceflight and astronomy entries from Wikipedia's record of this date, oldest first — from 1851 onward.
Pictures from this date
PUBLISHED5IMAGES
NASA's Astronomy Picture of the Day for September 11, one per year. Some are public domain and some belong to the photographer — each says which.
Published on September 11
NASA’s Astronomy Picture of the Day, for this calendar date in each of the last several years.
2025
The Umbra of Earth
The dark, inner shadow of planet Earth is called the umbra. Shaped like a cone extending into space, it has a circular cross section most easily seen during a lunar eclipse. And on the night of September 7/8 the Full Moon passed near the center of Earth's umbral cone, entertaining eclipse watchers around much of our fair planet, including parts of Antarctica, Australia, Asia, Europe, and Africa. Recorded from Zhangjiakou City, China, this timelapse composite image uses successive pictures from the total lunar eclipse, progressing right to left, to reveal the curved cross-section of the umbral shadow sliding across the Moon. Sunlight scattered by the atmosphere into Earth's umbra causes the lunar surface to appear reddened during totality. But close to the umbra's edge, the limb of the eclipsed Moon shows a distinct blue hue. The blue eclipsed moonlight originates as rays of sunlight pass through layers high in the upper stratosphere, colored by ozone that scatters red light and transmits blue. In the total phase of this leisurely lunar eclipse, the Moon was completely within the Earth's umbra for about 83 minutes.
© Wang Letian — used with the credit NASA publishes
2024
A Night Sky over the Tatra Mountains
A natural border between Slovakia and Poland is the Tatra Mountains. A prominent destination for astrophotographers, the Tatras are the highest mountain range in the Carpathians. In the featured image taken in May, one can see the center of our Milky Way galaxy with two of its famous stellar nurseries, the Lagoon and Omega Nebula, just over the top of the Tatras. Stellar nurseries are full of ionized hydrogen, a fundamental component for the formation of Earth-abundant water. As a fundamental ingredient in all known forms of life, water is a crucial element in the Universe. Such water can be seen in the foreground in the form of the Bialka River. Portal Universe: Random APOD Generator
NASA · public domain
2023
Beautiful Comet Nishimura
This scene would be beautiful even without the comet. By itself, the sunrise sky is an elegant deep blue on high, with faint white stars peeking through, while near the horizon is a pleasing tan. By itself, the foreground hills of eastern Slovakia are appealingly green, with the Zadňa hura and Veľká hora hills in the distance, and with the lights of small towns along the way. Venus, by itself on the right, appears unusually exquisite, surrounded by a colorful atmospheric corona. But what attracts the eye most is the comet. On the left, in this composite image taken just before dawn yesterday morning, is Comet Nishimura. On recent mornings around the globe, its bright coma and long ion tail make many a morning panoramic photo unusually beautiful. Tomorrow, C/2023 P1 (Nishimura) will pass its nearest to the Earth for about the next 434 years.
© Petr Horálek / Institute of Physics in Opava — used with the credit NASA publishes
2022
Planets of the Solar System: Tilts and Spins
How does your favorite planet spin? Does it spin rapidly around a nearly vertical axis, or horizontally, or backwards? The featured video animates NASA images of all eight planets in our Solar System to show them spinning side-by-side for an easy comparison. In the time-lapse video, a day on Earth -- one Earth rotation -- takes just a few seconds. Jupiter rotates the fastest, while Venus spins not only the slowest (can you see it?), but backwards. The inner rocky planets across the top underwent dramatic spin-altering collisions during the early days of the Solar System. Why planets spin and tilt as they do remains a topic of research with much insight gained from modern computer modeling and the recent discovery and analysis of hundreds of exoplanets: planets orbiting other stars.
NASA · public domain
2021
Saturn at Night
Still bright in planet Earth's night skies, good telescopic views of Saturn and its beautiful rings often make it a star at star parties. But this stunning view of Saturn's rings and night side just isn't possible from telescopes closer to the Sun than the outer planet. They can only bring Saturn's day into view. In fact, this image of Saturn's slender sunlit crescent with night's shadow cast across its broad and complex ring system was captured by the Cassini spacecraft. A robot spacecraft from planet Earth, Cassini called Saturn orbit home for 13 years before it was directed to dive into the atmosphere of the gas giant on September 15, 2017. This magnificent mosaic is composed of frames recorded by Cassini's wide-angle camera only two days before its grand final plunge. Saturn's night will not be seen again until another spaceship from Earth calls.
NASA · public domain
What happened on September 11
1851
Christiana Resistance: Escaped slaves led by William Parker fight off and kill a slave owner who, with a federal marshal and an armed party, sought to seize three of his former slaves in Christiana, Pennsylvania, thereby creating a cause célèbre between slavery proponents and abolitionists.
Christiana Riot ↗
1857
A legion of Mormon militiamen completed a massacre of at least 120 California-bound Arkansas pioneers at Mountain Meadow, Utah.
Nauvoo Legion ↗
1857
The Mountain Meadows massacre: Mormon settlers and Paiutes massacre 120 pioneers at Mountain Meadows, Utah.
Mountain Meadows Massacre ↗
1995
Mir EO-19, the first expedition to the Russian space station Mir launched on an American Space Shuttle, returned to Earth after approximately 75 days in space.
Mir EO-19 ↗
2024
Soyuz MS-26 is launched to the International Space Station, setting a record of 19 people in orbit at the same time.
Soyuz MS-26 ↗
2025
Progress MS-32 is launched to resupply the International Space Station. It is the 300th spacecraft launched to the ISS.
Progress MS-32 ↗
Sources and licences
Event text and thumbnails come from Wikipedia and are used under CC BY-SA 4.0. Images are drawn only from Wikimedia Commons, which does not accept non-free content — each thumbnail links to its file page, where its licence and author are recorded.
Launch records are from The Space Devs’ Launch Library 2. This archive is still being mirrored, so some days are incomplete. Pictures are NASA’s Astronomy Picture of the Day; NASA imagery is generally not subject to copyright, but individual APOD entries are frequently the property of the photographer, and each caption says which applies.
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Cosmos — Carl Sagan
Still the best single argument for why any of this matters, and it leaves the arithmetic in. For a reader who wants the science, not just the awe.
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Pale Blue Dot — Carl Sagan
The case for leaving Earth, written by someone unsentimental about how hard that is. Suits readers who want the argument rather than the poster.
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Project Hail Mary — Andy Weir
Hard-SF problem solving in The Martian's key — for anyone who liked the engineering more than the peril. The only novel on this list.
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