Questions tagged [geology]

Questions regarding surface features of celestial bodies.

Filter by
Sorted by
Tagged with
1 vote
0 answers
100 views

After one year exploring Jezero's crater floor, (why) hasn't there been any investigation into the presence of trace elements with PIXL?

PIXL instrument chart sample Credit:NASA/JPL-CALTECH Of course PIXL has been used already in Jezero crater, but as far as I know only to identify mineral compositions and textures, as described in ...
user avatar
  • 7,050
14 votes
3 answers
5k views

Rock arches on the moon?

The large rock in the centre right position (cut off by the image's right edge) of this photo seems to include the left part of a (small) natural arch: Is this indeed a rock arch? Are complete ...
user avatar
  • 1,587
3 votes
0 answers
111 views

How does Curiosity's X-ray diffractometer work? Does it measure only one angle at a time or does it have an area detector?

Per this answer to Are quasicrystals common on the Moon and Mars?, Curiosity has an X-ray diffractometer. X-ray diffraction from 3D crystals can (begin to) be understood by embracing Bragg's law. A 3D ...
user avatar
  • 148k
8 votes
1 answer
634 views

Are quasicrystals common on the Moon and Mars?

According to this 594, 7861 Nature article called First nuclear detonation created ‘impossible’ quasicrystals, the quasicrystals are readily created when where is an explosion or a meteorite impact ...
user avatar
6 votes
1 answer
382 views

White crack infill on the surface of Mars in the Gale Crater

The following picture, taken by the Curiosity rover in the Gale Crater on Mars in 2016 shows what appears to be a cracked Martian surface, with the Egg Rock nickel-iron meteorite. Ignoring the ...
user avatar
  • 10.6k
4 votes
1 answer
196 views

Difference between "mafic floor" and "olivine-bearing floor" in Jezero crater? (Perseverance landing site)

Figure 3: Main geologic units within Jezero crater shown on a basemap constructed from images from the High Resolution Imaging Science Experiment (HiRISE) camera onboard the Mars Reconnaissance ...
user avatar
  • 148k
0 votes
0 answers
70 views

Why Perseverance's landing ellipse straddled the cliffs in the river delta; why so ambivalent about the two different geologies?

The Perseverance landing site has now been named for Octavia E. Butler and from here there will be a meandering climb to get up on top of the "cliffs" that are in the delta. I think that ...
user avatar
  • 148k
5 votes
0 answers
63 views

Eyes on Mars; are these craters mentioned or described in any paper or (scientific) article?

Credit: NASA/JPL/University of Arizona HiRISE ESP_025334_2035 For a closer view, click on the image, and then, click again. This pair of similar craters is located in the northern part of Oyama crater,...
user avatar
  • 7,050
27 votes
4 answers
4k views

Do other planets and moons share Earth’s mineral diversity?

Earth is full of different minerals. Each patch of land, between plate tectonics and other forces, finds itself brimming with a variety of interesting and more importantly, different, minerals. Does ...
user avatar
3 votes
2 answers
367 views

How to determine the distance between Olympus Mons and Valles Marineris?

How can I determine the distance between Olympus Mons and the closest point of Valles Marineris? What tools are available to the general public for these kinds of queries?
user avatar
  • 135
10 votes
1 answer
194 views

Significance of Venus surface photos

Out of curiosity, I started looking for photos of Venus surface taken by various Russian probes. There is a nice collection here: http://mentallandscape.com/C_CatalogVenus.htm Not being a geologist, I ...
user avatar
  • 203
4 votes
0 answers
57 views

Why is the along track resolution of the MRO's SHARAD limited to >300m?

I've been reading about the SHAllow RADar instrument on the Mars Reconnaissance Orbiter, but I am struggling to understand why the along track resolution of its radargrams is so large. As I ...
user avatar
1 vote
0 answers
25 views

Theories Clarification

I attended a seminar and the presenter was discussing various theories to explain the strong magnetic anomalies on Mars as spotted from orbit. One theory was that the "Lithology is rich in ...
user avatar
20 votes
4 answers
3k views

Do scientist who study martian geology typically use the term areology?

In the book Red Mars by Kim Stanley Robinson, I came across the word "areology". Is this word often used in scientific publications, or is it a term limited to the scope of science-fiction, ...
user avatar
  • 4,812
4 votes
1 answer
107 views

Possible explanations to Mars' exceptionally strong magnetic anomalies

Some of the magnetic anomalies spotted in the southern hemisphere of Mars from orbit are exceptionally high in magnitude and they are an order of magnitude greater than what we would expect ...
user avatar
4 votes
2 answers
197 views

Where exactly are those eight steep slopes on Mars revealing structures of buried ice?

Credit:NASA/JPL-Caltech/UA/USGS The image above is from Phys.org's article Steep slopes on Mars reveal structure of buried ice that I came upon by the link in a comment from @Mark Adler after his ...
user avatar
  • 7,050
35 votes
3 answers
5k views

Why are there mountains/mounds in the centre of craters on the lunar surface?

From clear images of moon's surface we can see many of the craters have small mountains/mounds (or montes) in the centre. So, what is the mechanism behind the formation of these mountains and which ...
user avatar
  • 667
7 votes
1 answer
221 views

How did Spirit and Opportunity identify ferric sulfate and jarosite on Mars?

In the short BBC video Spain's otherworldly red river, Ricardo Amils, a researcher in Spain's Astrobiology Center says the following (amateur transcription): Río Tinto is a peculiar place in our ...
user avatar
  • 148k
1 vote
1 answer
143 views

Does the polygonal pattern on the floor of this "crater" on Mars mean that there's water ice below its surface?

This presentation of the Program of the Second MSL Landing Site Workshop shows an image of a "crater" near the equator that is 2.4 km wide and 750 meters deep ! On the Mars Image explorer you can ...
user avatar
  • 7,050
2 votes
1 answer
130 views

Can mineralogy maps be made without dedicated instruments? MAGIC at Callisto

While we are still waiting for the official Discovery finalists announcement, and it's perhaps a bit premature to be discussing the proposals, I've been thinking about the exciting MAGIC mission to ...
user avatar
10 votes
2 answers
409 views

What likely is the chemical composition of the thin piece of material on the surface of Mars on the image below?

Note: The MAHLI images below were acquired when both the two groups of white light LEDs and the ultraviolet LEDs were off. When looking for the damage on the wheels of Curiosity on the raw images i ...
user avatar
  • 7,050
3 votes
1 answer
582 views

Which scientific articles together give proof of all the chemical elements found on Mars?

Wikipedia about the elemental composition of Mars: Based on these data sources, scientists think that the most abundant chemical elements in the Martian crust, besides silicon and oxygen, are iron, ...
user avatar
  • 7,050
3 votes
1 answer
65 views

Is it recorded and/or documented when and where Curiosity's ChemCam's laser has zapped on Mars?

The article with the title "NASA Rover's Images Show Laser Flash on Martian Rock" tells us that the ChemCam's laser had zapped more than 600 rock and soil targets on Mars since Curiosity landed in ...
user avatar
  • 7,050
5 votes
1 answer
877 views

What is the white stuff emerging from a hole on the surface of Mars?

Edit: It can almost certainly be excluded that the white spot was caused by Curiosity's ChemCam's laser, because it doesn't make sense that the laser was used at that time without taking images with ...
user avatar
  • 7,050
6 votes
1 answer
290 views

Were launchpads at KSC built with pilings or footings?

Considering the importance of keeping a launchpad level, were pads 39A or 39B at Kennedy Space Center built with pilings or footings down to the bedrock? As seen in the quotes below, I have found ...
user avatar
  • 46.3k
3 votes
1 answer
283 views

Why was Apollo 17 considered to have "achieved a very successful geological survey"?

They listed out all the apollo missions, with blurbs about what the outcomes were, for example here's 15, 16 and 17: 15 - Landed on moon and deployed lunar rover. 16 - Landed on moon and deployed ...
user avatar
5 votes
2 answers
404 views

Does Mars have badlands?

This excellent answer addresses the amazing 3D structures shown in the image below: The terrain examples show some striking similarities to what is referred to in the United States as "Badlands" - ...
user avatar
  • 148k
6 votes
1 answer
300 views

Have the rovers on Mars encountered anything unrecognizable to geologists?

We have quite a few rovers trundling around Mars. Just from reading the popular news, I get the impression that everything encountered so far (minerals, rocks, strata, formations, structures, etc.) ...
user avatar
  • 163
5 votes
1 answer
302 views

What kinds of instruments do you need to detect whether liquid water/ice is on a planet?

Somewhat of a two-part question. Firstly I'm interested to know if it is expected that a planet/asteroid has water/ice on it, what kinds of scientific instruments you need to identify the presence and ...
user avatar
  • 273
6 votes
2 answers
379 views

Where on Mars did the largest river once flow?

It is generally accepted that once there was running water on the surface of Mars. Can it be determined from remote sensing data from space where the biggest, largest and longest ones were?
user avatar
  • 7,050
10 votes
1 answer
811 views

Is there any reason Cyanobacteria or Lichens can't survive on Mars?

According to this article "Mars atmosphere is supersaturated with water" & according to answers to this physics stack exchange question conditions do exist on the surface of Mars where fluid water ...
user avatar
  • 620
8 votes
1 answer
812 views

What's the deepest a trench could theoretically be dug on Mars?

Given the physical characteristics of Mars (the crust's thickness, its composition, gravity, etc.) how deep a trench (that could be expected to continue to exist indefinitely, or rather, for periods ...
user avatar
  • 620
3 votes
1 answer
115 views

Has the HP$^3$ on the Insight lander actually a probe to detect water and ice in the subsurface of Mars?

The Heat Flow and Physical Properties Package (HP$^3$) is a science instrument onboard the Insight lander that features a self-penetrating probe to determine how heat flows inside Mars. Nicknamed "the ...
user avatar
  • 7,050
2 votes
0 answers
53 views

Why are the heat sensor probes in HP3 probe spaced with reducing gap with depth?

The HP3 probe used for studying the geothermal features of Martian surface, hammers upto 5m deep and inserts a tether lined with heat sensor probes. This link shared earlier by @uhoh, is an ...
user avatar
  • 4,405
6 votes
4 answers
2k views

How could InSight's seismometers be intentionally and meaningfully "pinged"?

I had a friend whose summer job, a long long time ago, was to travel around an unsuspecting rural area, lay a heavy steel plate on the ground, and whack the plate with a sledge hammer. Apparently he ...
user avatar
  • 148k
2 votes
1 answer
300 views

What are the temperature and pressure inside the CO$_2$ deposit on Mars?

Within the CO$_2$ deposit near the south pole on Mars, according to this article 3 subunits have been found with one having a top CO$_2$ layer of about 300 meters thick covered by a water ice layer ...
user avatar
  • 7,050
2 votes
1 answer
155 views

What were the 21 potential landing sites for the Mars 2020 mission?

In August 2015 more than 150 scientists attended a conference to evaluate 21 potential landing sites for NASA's next rover, a mission called Mars 2020. Out of those proposed landing sites the Mars ...
user avatar
  • 7,050
7 votes
1 answer
251 views

Where on Mars are the possible other collapse features with very high depth/diameter ratio?

Figure 1 of this article about craters and collapse features on Mars with high depth/diameter ratios shows that ratios higher than 0.2 are exceptional. This presentation of the Program of the Second ...
user avatar
  • 7,050
13 votes
1 answer
470 views

Are there microclimates with better weather conditions on Mars?

On Earth, a microclimate mostly refers to an area which differs from the surrounding areas in temperature or humidity. And what about Mars ? Are there places with atmospheric conditions that are less ...
user avatar
  • 7,050
1 vote
3 answers
336 views

Would a circular saw on one arm and a trowel on another on the Mars 2020 rover add scientific value? [closed]

Edit: I changed the question from one arm with a shovel to two arms, with one with a circular saw and the other with a trowel, some time after the first answer of @Hobbes. I did this because in his ...
user avatar
  • 7,050
5 votes
2 answers
541 views

Which potential landing sites were identified at the MSL Landing Site workshops?

In the Wikipedia article Timeline of Mars Science Laboratory it is mentioned that at the first MSL Landing Site workshop, 33 potential landing sites were identified, and that by the second workshop in ...
user avatar
  • 7,050
3 votes
2 answers
185 views

What is the real depth of the Mojave crater on Mars?

The Mojave crater on Mars is interesting because among other things, it has alluvial fans that look remarkably similar to landforms in the Mojave desert. On the image1 above the crater has about ...
user avatar
  • 7,050
9 votes
1 answer
513 views

Why is the northeastern region of Syrtis Major Planum a selected landing site for the Mars 2020 mission?

Image below: One of the 3 selected landing sites, on the left side of Jezero crater, which is also selected ! A workshop for the Mars 2020 Rover mission was held in February 2017 that selected 3 ...
user avatar
  • 7,050
4 votes
2 answers
177 views

How does one get the exact location of imaged features on the surface of Mars?

The image above is from the article "Evidence from the Mars Express High Resolution Stereo Camera for a frozen sea close to Mars' equator". It shows 3 flooded or partially flooded craters 4.8, 2.3 ...
user avatar
  • 7,050
10 votes
1 answer
562 views

Is there really a frozen lake near the equator on Mars?

Figure 1. Views of plate-like terrain on Mars, and pack-ice on Earth. From the paper linked below. a, Part of an HRSC image of Mars from orbit 32, with a resolution of 13.7 m per pixel, centred at ...
user avatar
  • 7,050
9 votes
1 answer
608 views

What type of rock or soil on Mars will give Nostoc Commune cyanobacteria the best chance to survive there?

Photo taken by YAMAMAYA Cyanobacteria are a group of photosynthetic bacteria, who use the energy of light to synthesize organic compounds from carbon dioxide, and producing oxygen this way. Nostoc ...
user avatar
  • 7,050
6 votes
2 answers
503 views

Why is Curiosity remaining on the Vera Rubin Ridge for so long?

Have the MSL mission team members become overwhelmed by the iron-rich rocks on the ridge ? Image from: https://mars.nasa.gov/msl/mission/mars-rover-curiosity-mission-updates/?mu=sol-2018-rock-...
user avatar
  • 7,050
0 votes
1 answer
135 views

What are the geological features for a save place to land in the chaos terrains on Mars? [closed]

Chaos terrains on Mars generally consist of irregular groups of large blocks, some tens of kilometers across and a hundred meters high. The tilted and flat topped blocks form depressions hundreds ...
user avatar
  • 7,050
19 votes
1 answer
1k views

Why is Curiosity not heading for Peace Vallis?

For over 5 years Curiosity has been successfully searching for many signs that water was once present at Gale crater. Its geology is notable for containing both clays and sulfate minerals that may ...
user avatar
  • 7,050
2 votes
1 answer
336 views

Why does the Mars Global Surveyor carry a bit of the Zagami meteorite?

The NASA News item A Piece of Mars is Going Home begins: A piece of a meteorite called Sayh al Uhaymir 008 (SaU008) will be carried on board NASA's Mars 2020 rover mission, now being built at the ...
user avatar
  • 148k