September 13, 2016 Zimmerman/Batchelor podcast
Embedded below the fold. Tonight was a special double podcast, lasting almost 40 minutes. The first segment looks at the September 1 SpaceX launchpad situation, the second segment looks at Blue Origin and its new proposed rocket, the third segment looks at the state of Virgin Galactic and the Russian space industry as well as the Mars rovers, and the last segment looks at Mars, the Moon, earthquakes, and the coming end of Rosetta.
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Embedded below the fold. Tonight was a special double podcast, lasting almost 40 minutes. The first segment looks at the September 1 SpaceX launchpad situation, the second segment looks at Blue Origin and its new proposed rocket, the third segment looks at the state of Virgin Galactic and the Russian space industry as well as the Mars rovers, and the last segment looks at Mars, the Moon, earthquakes, and the coming end of Rosetta.
Readers!
My annual February birthday fund-raising drive for Behind the Black is now over. Thank you to everyone who donated or subscribed. While not a record-setter, the donations were more than sufficient and slightly above average.
As I have said many times before, I can’t express what it means to me to get such support, especially as no one is required to pay anything to read my work. Thank you all again!
For those readers who like my work here at Behind the Black and haven't contributed so far, please consider donating or subscribing. My analysis of space, politics, and culture, taken from the perspective of an historian, is almost always on the money and ahead of the game. For example, in 2020 I correctly predicted that the COVID panic was unnecessary, that the virus was apparently simply a variation of the flu, that masks were not simply pointless but if worn incorrectly were a health threat, that the lockdowns were a disaster and did nothing to stop the spread of COVID. Every one of those 2020 conclusions has turned out right.
Your help allows me to do this kind of intelligent analysis. I take no advertising or sponsors, so my reporting isn't influenced by donations by established space or drug companies. Instead, I rely entirely on donations and subscriptions from my readers, which gives me the freedom to write what I think, unencumbered by outside influences.
You can support me either by giving a one-time contribution or a regular subscription. There are four ways of doing so:
1. Zelle: This is the only internet method that charges no fees. All you have to do is use the Zelle link at your internet bank and give my name and email address (zimmerman at nasw dot org). What you donate is what I get.
2. Patreon: Go to my website there and pick one of five monthly subscription amounts, or by making a one-time donation.
3. A Paypal Donation or subscription:
4. Donate by check, payable to Robert Zimmerman and mailed to
Behind The Black
c/o Robert Zimmerman
P.O.Box 1262
Cortaro, AZ 85652
You can also support me by buying one of my books, as noted in the boxes interspersed throughout the webpage or shown in the menu above.
Hello.
Starting at roughly 37:25, you / Mr. Batchelor discussed how the Moon might possibly cause earthquakes at high (Earth) tides during new / full Moon phases. You basically said that based on tidal effects and the effects of gas giants on their own moons that the Moon might well influence earthquake activity. I’m wondering about the effect of the Earth on the Moon, if this might cause moonquakes. Space.com
http://www.space.com/18135-how-big-is-the-moon.html
says that the Moon has 1.2% of Earth mass, so FWIW that differential is “fairly” large, but nothing like the Jupiter / Saturn / etc. systems, of course. The Moon has tidal locking, Earth does not, so the Moon does not rotate and therefore, its surface does not flex and would not heat the interior. Based on this, it looks like Earth does not cause moonquakes. Thoughts?
Thanks!
Sorry – the Moon obviously DOES rotate – just not relative to the Earth. They call that tidal locking!
Greg Jones,
Nice observation. I haven’t looked into this topic before, because the moon is fairly solid. It has a small liquid core (about 20% of the diameter) so plate tectonics is unlikely, thus no tidal effects. Thus the only moonquakes would be from meteorite impacts, right?
But wait! I came across this tidbit on NASA’s site:
http://science.nasa.gov/science-news/science-at-nasa/2006/15mar_moonquakes/
“There are at least four different kinds of moonquakes: (1) deep moonquakes about 700 km below the surface, probably caused by tides”
As you pointed out, Greg, the Moon does rotate, so the tides would be caused by the sun.
Whether there is enough flexing to heat the interior is a mystery to me, but I would have said “no, obviously not” just a few minutes ago.
Good show, always enjoy the longer-form! (the mp3 download only has the 1 intro-commercial, priceless!)
Greg Jones/Edward–
Fairly good read you might find of interest. Not a full-blown geology-techie text-book, but not dumbed down. (originally published 1995 with a revision in 2007)
They cover all the Planets but you can only read chapter 4 for free on-line. (or I should say– I have the hard-copy ’95 edition. The online version is the 2007 revision, & I don’t think it’s available in its entirety for free but I haven’t looked.)
“Exploring the Planets”
Chapter 4: The Geology of the Moon
http://explanet.info/Chapter04.htm#
(I wouldn’t be surprised that Gravity is having its way with all of us & everything!)