68 votes

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

Oh, I can answer this one. In my structural geology class, we breezed over a few paragraphs on the tectonics of impact craters, but it was in the textbook, and, being space-related, I was intrigued. ...
Anton Hengst's user avatar
  • 10.7k
15 votes

What is the deepest part of the moon on the near side?

Looks like it's Hercules G, which is a crater nested inside the larger crater of Hercules. It's about 10 km across, and Hercules is about 45 km across. You can look on the LROC Quickmap for stuff like ...
kim holder's user avatar
  • 21.4k
13 votes

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

It's actually a rebound effect that occurs with an impact forming a large crater. https://www.lpi.usra.edu/education/explore/shaping_the_planets/impact-cratering/ explains: Central peaks – Peaks ...
Oscar Lanzi's user avatar
  • 8,505
13 votes

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

It might help to compare the crater formation to a drop impact: It seems that rock can behave like a viscous mass if you hit it fast enough.
Eric Duminil's user avatar
  • 1,678
11 votes

What is the deepest part of the moon on the near side?

Following Kim Holder's advice to "pan around", there's also Clavius D (-58.7, -12.4), another embedded crater inside the larger Clavius. It's one step lower in absolute elevation, in the -...
SE - stop firing the good guys's user avatar
7 votes

Did Conrad and Bean balk at entering the 650-foot-wide Surveyor Crater, or just express concern? What data had they seen?

Overall it seems that the NYT article has garbled the details: although the initial low-angle sunlight made Surveyor Crater look too steep, the estimated angle of about 11 degrees proved manageable by ...
Tom Goodfellow's user avatar
7 votes
Accepted

How does one get Context Camera (CTX) images from Mars with certain identification numbers?

Yes, just go to https://viewer.mars.asu.edu/viewer/ctx and then enter the image ID in the Product ID field. However, note that the image IDs are slightly different from what you posted: you have to ...
BlueCoder's user avatar
  • 2,113
7 votes
Accepted

Why do two craters in Utopia Planitia look like dark holes and are of the few ones on Mars that look this way?

This seems to be some unlucky stitching of two individual images taken at very different times of the day. In the first picture you can clearly see an almost vertical line stretching through the whole ...
asdfex's user avatar
  • 15k
6 votes
Accepted

Depth to diameter ratio of impact craters

As one might expect, detailing the key geometric features of craters, including the slope angle of the walls, involves more than a few additional dimensional measurements. In real craters the walls ...
Oscar Lanzi's user avatar
  • 8,505
6 votes
Accepted

How much is the difference of gravity attraction between the highest and lowest point on Mars?

tl;dr: Relative to Earth, the weight of an object on Mars would be about 37.36% and 38.09% on Olympus Mons and Hellas Planitia. The difference between those two is about 2.0%. That compares to only a ...
uhoh's user avatar
  • 149k
5 votes
Accepted

Where are the meteorite remnants related to the craters they've produced on the moon?

All over the place But as the whole surface of the Moon is either rock, or rock broken by meteor impacts, or meteors, it becomes very difficult to identify them. Moon meteorites will have none of the ...
CuteKItty_pleaseStopBArking's user avatar
5 votes
Accepted

Where on Mars are there other craters or collapse features with very high depth/diameter ratio?

The d/D ratio of Martian craters vary from 0.1 to 0.4 with mean value of 0.23. The largest crater with diameter 33m has d/D ratio of 0.2 but smaller craters have higher d/D value. One crater has a ...
Nilay Ghosh's user avatar
  • 1,024
4 votes

Moon craters. How deep do they get?

According to NASA, the deepest crater (and the widest) is the South Pole-Aitken basin, almost 1,500 miles (2500 km) across and more than five miles (8 km) deep. Wikipedia mentions Newton at 6.1 km, ...
Hobbes's user avatar
  • 128k
4 votes

Could Bepi-Colombo image the Messenger impact site?

NASA was predicting the Messenger would produce an impact crater 16 metres across. The imaging system on the BepiColombo MPO is called SIMBIO-SYS and this has a High spatial Resolution Imaging ...
Dave Gremlin's user avatar
  • 2,891
4 votes

Is crater counting accurate for relative dating between celestial bodies?

Crater density dating is used for each celestial object individually. A higher density for a particular object, say the Moon, implies that region of the Moon is older than a region on the Moon with a ...
Fred's user avatar
  • 13.1k
3 votes
Accepted

Is crater counting accurate for relative dating between celestial bodies?

It can be done, to a certain level of accuracy. The question boils down to whether cratering rates are unique to individual planets, or common between planets within the solar system. The answer is ...
Dan Hanson's user avatar
  • 2,218
3 votes

Is crater counting accurate for relative dating between celestial bodies?

In December of 2020 China's Change'e 5 brought a 3.81 lb sample from the moon. The dating of bits from that sample to about two billion years ago helps to estimate the age of celestial surfaces with a ...
Fredrick Germann's user avatar
3 votes

Why does the Moon's Anaxagoras crater seem sort of jumbled?

There have been a few internet post about the Anaxagoras Crater, on the Moon. Regarding the central peaks, the floor of the crater has "a section of the anorthositic central peak complex". ...
Fred's user avatar
  • 13.1k
3 votes
Accepted

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

NASA confirms the latter - 2600m: The depth of the crater -- about 2.6 kilometers (1.6 miles) -- also demonstrates that Mojave has experienced little infilling or erosion. The terrain was mapped ...
Jack's user avatar
  • 9,976
3 votes

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

The article contains several bits of information that will be useful: Extensive fields of large fractured plate-like features on a horizontal surface are visible near the south end of the High ...
Hobbes's user avatar
  • 128k
2 votes
Accepted

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

The Planetary Data System (PDS, pds.nasa.gov) contains data (including imagery) collected from all NASA planetary missions, including, of course, Mars. The PDS repositories include an entire archive (...
That60sKid's user avatar
2 votes

Did the rovers' cruise balance masses have a noticeable impact on Mars?

Photos from Mars Reconnaissance Orbiter show the impact sites from Curiosity's 2 main ballast weights about 80 km from the rover, plus the impact sites of the 6 smaller weights jettisoned just before ...
giles tester's user avatar
1 vote

Did Conrad and Bean balk at entering the 650-foot-wide Surveyor Crater, or just express concern? What data had they seen?

It helps to do the math. Tangent 21 degrees = .384 = 38.4 % grade. This is around 5 times steeper than most anything you'll see driving around the Rocky mountains of Western USA. Very difficult to ...
Robert DiGiovanni's user avatar
1 vote

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

Like the answer from @Jack already noted, the confusion is indeed from comparing depth vs elevation. What i really wanted to know was the depth below "sea level". With Mars Trek's "Calculate Elevation ...
Cornelis's user avatar
  • 7,545
1 vote

How deep a crater could an impactor spacecraft cause on Mars?

It comes down to how much spacecraft you want to throw at it. Newton tells us that a high speed impactor will be basically stopped by displacing it's own mass. (Although if what it hits is hard ...
Loren Pechtel's user avatar
1 vote

How deep is the regolith around this crater?

Using @TildalWave's suggested method of estimating the depth of the regolithe, I looked for boulders penetrating the surface layer. There are a couple of them: Most notable however are the large (...
SE - stop firing the good guys's user avatar

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