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Astronomy Picture of the Day - Stickney Crater
NASA ^ | 9 Oct, 2026 | Credit: HiRISE, MRO, LPL (U. Arizona), NASA, Authors & editors: Jerry Bonnell, Cecilia Chirenti, Rob

Posted on 10/09/2026 11:33:37 AM PDT by MtnClimber

Explanation: Stickney Crater, the largest crater on the martian moon Phobos, is named for Chloe Angeline Stickney Hall, mathematician and wife of astronomer Asaph Hall. Asaph Hall discovered both the Red Planet's moons in 1877. Over 9 kilometers across, Stickney is nearly half the diameter of Phobos itself, so large that the impact that blasted out the crater likely came close to shattering the tiny moon. This enhanced-color image of Stickney and surroundings was recorded by the HiRISE camera onboard the Mars Reconnaissance Orbiter as it passed within some six thousand kilometers of Phobos in March of 2008. Even though the surface gravity of asteroid-like Phobos is less than 1/1000th Earth's gravity, streaks suggest loose material slid down inside the crater walls over time. Light bluish regions near the crater's rim could indicate a relatively freshly exposed surface. The origin of the curious grooves along the surface is mysterious but may be related to tidal stresses experienced by close-orbiting Phobos or the crater-forming impact itself.


TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: apod; nasa
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1 posted on 10/09/2026 11:33:37 AM PDT by MtnClimber
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To: MtnClimber

2 posted on 10/09/2026 11:33:54 AM PDT by MtnClimber (For photos of scenery, wildlife and climbing, click on my screen name for my FR home page.)
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To: 21stCenturion; 21twelve; 31R1O; 4everontheRight; A Navy Vet; A_perfect_lady; abb; AFB-XYZ; ...
Pinging the APOD list

🪐 🌟 🌌 🍔

3 posted on 10/09/2026 11:34:31 AM PDT by MtnClimber (For photos of scenery, wildlife and climbing, click on my screen name for my FR home page.)
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To: MtnClimber

Attempt no landing on Phobos.


4 posted on 10/09/2026 11:49:57 AM PDT by dljordan (Where's th"e rest of the Epstein files hmmmm?)
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To: MtnClimber

Looks kinda like a volleyball after our Akita gets through with it.


5 posted on 10/09/2026 11:52:17 AM PDT by Bullish (My tagline ran off with another man, but it's okay... I wasn't married to it.)
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To: MtnClimber

Looks like a jellyfish.


6 posted on 10/09/2026 12:10:35 PM PDT by No name given ( Anonymous is who you’ll know me as )
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To: No name given
Looks like a jellyfish.

Exactly, are we sure Phobos isn't a galactic Jellyfish.

7 posted on 10/09/2026 1:08:20 PM PDT by DannyTN
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To: MtnClimber

Those tracks might have something to do with that white stuff, whatever it is.


8 posted on 10/09/2026 2:06:55 PM PDT by Nateman (Democrats did not strive for fraud friendly voting merely to continue honest elections.)
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To: MtnClimber

That looks alive.


9 posted on 10/09/2026 2:12:26 PM PDT by ComputerGuy
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To: MtnClimber

That’s one messed-up moon.


10 posted on 10/09/2026 6:26:53 PM PDT by telescope115 (Ad Astra, Ad Deum…)
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To: dljordan

Fobos-Grunt
Just the name makes this worth reading.

“ Fobos-Grunt or Phobos-Grunt (Russian: Фобос-Грунт, lit. ‘Phobos-soil’) was an attempted Russian sample return mission to Phobos, one of the moons of Mars. Fobos-Grunt also carried the Chinese Mars orbiter Yinghuo-1 and the tiny Living Interplanetary Flight Experiment funded by the Planetary Society.[4][5]

It was launched on 8 November 2011, at 20:16 UTC, from the Baikonur Cosmodrome, but subsequent rocket burns intended to set the craft on a course for Mars failed, leaving it stranded in low Earth orbit.[6][7] Efforts to reactivate the craft were unsuccessful, and it fell back to Earth in an uncontrolled re-entry on 15 January 2012, over the Pacific Ocean, west of Chile.[8][9][10] The return vehicle was to have returned to Earth in August 2014, carrying up to 200 g (7.1 oz) of soil from Phobos.”

https://en.wikipedia.org/wiki/Fobos-Grunt#Mass_summary

The rest of the article is interesting, and parts are fun, but it only supports your statement.


11 posted on 10/09/2026 8:24:29 PM PDT by VanShuyten ("...that all the donkeys were dead. I know nothing as to the fate of the less valuable animals. )
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