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Astronomy Picture of the Day -- Lunar Farside
NASA ^ | April 05, 2014 | (see photo credit)

Posted on 04/05/2014 4:06:18 AM PDT by SunkenCiv

Explanation: Tidally locked in synchronous rotation, the Moon always presents its familiar nearside to denizens of planet Earth. From lunar orbit, the Moon's farside can become familiar, though. In fact this sharp picture, a mosaic from the Lunar Reconnaissance Orbiter's wide angle camera, is centered on the lunar farside. Part of a global mosaic of over 15,000 images acquired between November 2009 and February 2011, the highest resolution version shows features at a scale of 100 meters per pixel. Surprisingly, the rough and battered surface of the farside looks very different from the nearside covered with smooth dark lunar maria. The likely explanation is that the farside crust is thicker, making it harder for molten material from the interior to flow to the surface and form the smooth maria.

April 05, 2014

(Excerpt) Read more at 129.164.179.22 ...


TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: apod; astronomy; moon; science
[Credit: NASA / GSFC / Arizona State Univ. / Lunar Reconnaissance Orbiter]

1 posted on 04/05/2014 4:06:19 AM PDT by SunkenCiv
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To: brytlea; cripplecreek; decimon; bigheadfred; KoRn; Grammy; married21; steelyourfaith; Mmogamer; ...
The Big One

2 posted on 04/05/2014 4:07:00 AM PDT by SunkenCiv (Obama is now making Jimmy Carter look like Attila the Hun. /focus/news/3138768/posts)
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To: SunkenCiv
Surprisingly, the rough and battered surface of the farside looks very different from the nearside covered with smooth dark lunar maria.

Wouldn't it also protect earth so to speak? Things heading toward earth might be intercepted by the moon and they would impact on that side.

3 posted on 04/05/2014 4:30:12 AM PDT by raybbr (Obamacare needs a death panel.)
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To: raybbr

Pink Floyd will see you now!


4 posted on 04/05/2014 5:02:15 AM PDT by left that other site
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To: SunkenCiv

Civ, where’s the Nazi base?


5 posted on 04/05/2014 5:05:56 AM PDT by Dr. Bogus Pachysandra ( Ya can't pick up a turd by the clean end!)
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To: Dr. Bogus Pachysandra

They photoshopped it out...


6 posted on 04/05/2014 6:00:13 AM PDT by baddog 219
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To: raybbr
"Wouldn't it also protect earth so to speak?"

I suppose it can, and does; but probably not as much as one would think. Ask the Dinosaurs - well, you can't. From what I understand Jupiter offers us a great deal of help in that regard. Jupiter has a huge gravity well. Our Moon does 'help' us in a great many other ways. Life/Earth as we know it wouldn't exist without it.

7 posted on 04/05/2014 6:01:47 AM PDT by KoRn (Department of Homeland Security, Certified - "Right Wing Extremist")
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To: raybbr; SunkenCiv
The likely explanation is that the farside crust is thicker, making it harder for molten material from the interior to flow to the surface and form the smooth maria.

uh huh

Things heading toward earth might be intercepted by the moon and they would impact on that side.

Bingo

8 posted on 04/05/2014 6:28:44 AM PDT by bigheadfred
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To: baddog 219

By the moon fuhrer’s earthbound network of spies.


9 posted on 04/05/2014 7:09:50 AM PDT by wally_bert (There are no winners in a game of losers. I'm Tommy Joyce, welcome to the Oriental Lounge.)
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To: SunkenCiv

I bet Mr. Larson has a better maid...


10 posted on 04/05/2014 7:10:57 AM PDT by MortMan (Is a delayed shower a "stay of exablution"?)
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To: SunkenCiv

Sobering to think of the few people who have seen that side ....


11 posted on 04/05/2014 7:12:40 AM PDT by Robert A. Cook, PE (I can only donate monthly, but socialists' ABBCNNBCBS continue to lie every day!)
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To: All

Just a question ... does anyone know if the moon is a true sphere, or, like the earth, an oblate spheroid?


12 posted on 04/05/2014 8:34:17 AM PDT by IronJack
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To: bigheadfred

No. There would be little bias if any for farsIde impacts. It just doesn’t work that way, orbital mechanics 101.


13 posted on 04/05/2014 8:36:08 AM PDT by John Valentine (Deep in the Heart of Texas)
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To: SunkenCiv

People living on the far side of the Moon, don’t know that Earth exists.


14 posted on 04/05/2014 8:41:35 AM PDT by Starstruck (If my reply offends, you probably don't understand sarcasm or criticism...or do.)
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To: raybbr

Not a lot of opportunity for the moon to shield the earth. This is a picture of the earth and moon taken from Saturn in 2013.

15 posted on 04/05/2014 8:59:36 AM PDT by <1/1,000,000th%
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To: John Valentine; <1/1,000,000th%; bigheadfred; KoRn; raybbr

Thanks John Valentine and <1/1,000,000th%/, well explained.

The Moon is only about 2000 miles in diameter, and space debris is more likely to hit the 8000 mile diameter Earth. It can come from all directions. Impacts on the lunar surface have been observed a few times, I’ll scare up some links for the bottom of this post.

The difference between the two hemispheres of the Moon is analogous to the Martian surface, and as the fringe author Donald Patten suggested, the “Hemisphere of Craters” on Mars probably would look like the “Opposite Hemisphere”, vis a vis crater distribution, if it weren’t for a single large impact event sometime in the Martian past, during which a lot of craters formed more or less simultaneously.

The Moon probably had a very similar large impact event, or several, resulting in a resurfacing of the visible side, covering the original crater structure which looked a lot like the far side does now.

The tidal lock which the Moon now has with the Earth is due to the tidal transfer of momentum common to satellites; the Moon is about 1 percent the mass of the Earth, and while this tidal transfer is basically causing the distance between the Earth and Moon to increase over time, the energy for that comes out of a slow deceleration of the rotation on the axis.

Given enough time, the Earth could lose enough to be tidally locked with the Moon. The two globes might then show the same faces to each other from then on. Before that time the Moon will probably be pushed far enough away to leave the Earth’s sphere of influence and go on a field trip through the Solar System.

Thanks all.

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16 posted on 04/05/2014 9:27:49 AM PDT by SunkenCiv (Obama is now making Jimmy Carter look like Attila the Hun. /focus/news/3138768/posts)
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To: Dr. Bogus Pachysandra; baddog 219

After they abandoned their UFO base in Antarctica, they moved operations to the Moon, but they didn’t stay long — they headed to the Mars colony started by Marconi. At least, that’s what I remember from David Hatcher Childress. ;’)


17 posted on 04/05/2014 9:46:57 AM PDT by SunkenCiv (Obama is now making Jimmy Carter look like Attila the Hun. /focus/news/3138768/posts)
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To: Robert A. Cook, PE

And of those few, only six have seen it when they were alone.


18 posted on 04/05/2014 9:48:36 AM PDT by SunkenCiv (Obama is now making Jimmy Carter look like Attila the Hun. /focus/news/3138768/posts)
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Here’s a link to the full sized shot (it’s also linked in the ping message above):

http://129.164.179.22/apod/image/1404/farside_lro1600.jpg

In the lower right near the vertical centerline there’s a large, darker spot; notice how it’s mostly without craters, with perhaps a dozen small ones? That appears to have been a large “maria” impact scar like we see on the visible side, which resurfaced and erased the craters which had been there before; subsequently more small impacts left more conventional craters.


19 posted on 04/05/2014 9:53:27 AM PDT by SunkenCiv (Obama is now making Jimmy Carter look like Attila the Hun. /focus/news/3138768/posts)
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To: SunkenCiv
Uhh, you don't wanna know what's on the Lunar far-side ....


20 posted on 04/05/2014 10:46:11 AM PDT by mikrofon ("That's no moon...")
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To: mikrofon

That’s no moon...


21 posted on 04/05/2014 11:22:51 AM PDT by SunkenCiv (Obama is now making Jimmy Carter look like Attila the Hun. /focus/news/3138768/posts)
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To: SunkenCiv

Nice little ping there, Mr. Civilizations. Thank you.

My first thought was that it is far different from the side that faces Earth.

It is an interesting theory that the far side has a thicker crust which minimizes eruptions
and prevents large, smooth maria.

Perhaps the outward-facing side would also get more hits from wandering space rocks.
It certainly looks more pock marked than the Giant Rabbit/Man in the Moon side.


22 posted on 04/05/2014 11:31:40 AM PDT by TheOldLady
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To: SunkenCiv

And really, who doesn’t like a smooth Maria ?


23 posted on 04/05/2014 11:33:00 AM PDT by fieldmarshaldj (Resist We Much)
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To: mikrofon

LOL!


24 posted on 04/05/2014 1:37:10 PM PDT by <1/1,000,000th%
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