tag:blogger.com,1999:blog-22973357.post7165441133416960214..comments2023-09-27T07:44:19.769-04:00Comments on Sabine Hossenfelder: Backreaction: A "Black Hole" on MarsSabine Hossenfelderhttp://www.blogger.com/profile/06151209308084588985noreply@blogger.comBlogger19125tag:blogger.com,1999:blog-22973357.post-7155014412115876112007-06-06T22:31:00.000-04:002007-06-06T22:31:00.000-04:00"Now it looks like a crater with ripples in some n..."Now it looks like a crater with ripples in some nonreflecting material at the bottom. My guess would be ice mixed with black volcanic dust."<BR/><BR/>Sounds plausible... but not as exciting as a "skylight in a lava tube cavern". <BR/><BR/>Hopefully we'll find out soon.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-1826555839143448142007-06-03T18:45:00.000-04:002007-06-03T18:45:00.000-04:00Of course one can see details in that black hole, ...Of course one can see details in that black hole, if you have ACDSee on your computer take a look at the "detailed picture" in the beginning of the article and use the "embossing" function, then look at the right picture. It definitively shows, in relief, details. Now it looks like a crater with ripples in some nonreflecting material at the bottom. My guess would be ice mixed with black volcanic Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-47358065402303578872007-05-30T19:41:00.000-04:002007-05-30T19:41:00.000-04:00Stefan, as it turns out, my day job involves getti...Stefan, as it turns out, my day job involves getting environmental permits in order for a biofuel plant. One of the things I had to write up yesterday was a description of the hydrology of the site. Turns out that it's on basalt which is, sure enough, run through with lava tubes through which water moves very well.CarlBrannenhttps://www.blogger.com/profile/17180079098492232258noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-75174301483314726422007-05-29T15:20:00.000-04:002007-05-29T15:20:00.000-04:00Hm, just noticed, if you klick on the maps.google ...Hm, just noticed, if you klick on the <A HREF="http://maps.google.com/maps?t=k&q=22.993347,-98.161331&ie=UTF8&om=1&ll=22.993321,-98.161297&spn=0.094498,0.103512&z=13" REL="nofollow">maps.google link for Zacaton</A>, you have to zoom out a little bit before you can see something...<BR/><BR/><BR/><BR/>Hi RaeAnn,<BR/><BR/><I>I just heard about NASA (I think?) testing a deep diving device for future stefanhttps://www.blogger.com/profile/09495628046446378453noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-64175533134697429732007-05-29T15:07:00.000-04:002007-05-29T15:07:00.000-04:00Hi changcho, CarlIf you look in detail at Emily La...Hi changcho, Carl<BR/><BR/><BR/><I>If you look in detail at Emily Lakdawalla's Planetary Society weblog, there are several of these 'holes'</I><BR/><BR/>yes, indeed - and interestingly, the Zacaton sinkhole is also only one hole of a whole system of caverns - you can see them on the satellite photos at <A HREF="http://maps.google.com/maps?ll=22.993347,-98.161331&spn=0.01,0.01&t=k&q=22.993347,stefanhttps://www.blogger.com/profile/09495628046446378453noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-20597980231335367442007-05-29T14:04:00.000-04:002007-05-29T14:04:00.000-04:00maybe it's not a cavern at all, but a wormhole ;-)...<I>maybe it's not a cavern at all, but a wormhole ;-) </I><BR/><BR/>I thought that planet looked a little too <A HREF="http://jwgibbs.cchem.berkeley.edu/pete/dune.gif" REL="nofollow">familiar</A>.<BR/><BR/>Hi Rae Ann,<BR/><BR/>Actually Venus is the runaway greenhouse planet, whereas Mars represents the opposite extreme end of <A HREF="http://www.astronomynotes.com/solarsys/s9.htm" REL="nofollow">islandhttps://www.blogger.com/profile/16774086177497447408noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-28554333992066943522007-05-29T11:28:00.000-04:002007-05-29T11:28:00.000-04:00Of course it's been caused by global warming on Ma...Of course it's been caused by global warming on Mars. ;-) I just heard about NASA (I think?) testing a deep diving device for future use in exploring Europa, and I'm pretty sure they are testing it in the Mexican sinkhole.Rae Annhttps://www.blogger.com/profile/10239791074376508016noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-28162633996797810622007-05-29T10:42:00.000-04:002007-05-29T10:42:00.000-04:00Somebody call Louise and tell her that one of her ...Somebody call Louise and tell her that one of her pets got loose again...islandhttps://www.blogger.com/profile/16774086177497447408noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-24074319209322903932007-05-29T04:27:00.000-04:002007-05-29T04:27:00.000-04:00Another picture. They're on the side of a volcano...<A HREF="http://antwrp.gsfc.nasa.gov/apod/ap070528.html" REL="nofollow">Another picture.</A> They're on the side of a volcano so they're almost certainly <A HREF="http://en.wikipedia.org/wiki/Lava_tube" REL="nofollow">lava tubes</A> that form when lava empties out of a lava flow.CarlBrannenhttps://www.blogger.com/profile/17180079098492232258noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-12589273486787036352007-05-29T04:11:00.000-04:002007-05-29T04:11:00.000-04:00Hmmm. Here is the scientific paper.Hmmm. Here is the <A HREF="http://www.lpi.usra.edu/meetings/lpsc2007/pdf/1371.pdf" REL="nofollow">scientific paper.</A>CarlBrannenhttps://www.blogger.com/profile/17180079098492232258noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-34915488674329914482007-05-29T04:07:00.000-04:002007-05-29T04:07:00.000-04:00Dear Stefan, maybe it is not a hole but just a sta...Dear Stefan, maybe it is not a hole but just a stain or black spot in the HiRISE camera on board <BR/>due to some martian bird waste.<BR/><BR/>Happens to me all the time just after washing my car<BR/>;-)<BR/><BR/>bestAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-49472201158263954782007-05-29T04:04:00.000-04:002007-05-29T04:04:00.000-04:00The only way I can see to make something like this...The only way I can see to make something like this is to (a) have an ocean of water, (b) have it freeze, (c) have it covered with dirt, perhaps from a volcano, and then (d) have part of it remove its protective cover and begin to sublimate away.CarlBrannenhttps://www.blogger.com/profile/17180079098492232258noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-40570784836076374322007-05-29T02:30:00.000-04:002007-05-29T02:30:00.000-04:00What this is,a guess would be: we have a shallow l...What this is,<BR/><BR/>a guess would be: we have a shallow lake with water-soaked sand at its bottom. <BR/>The water-sand mix goes down to a couple of hundred meters dept.<BR/><BR/>a meteor impacts with a force in the range of kilotonnes.<BR/><BR/>Water explodes as it is instantaneously heated to a phase of superheated steam. (answer to: where did the displaced material go?)<BR/><BR/>Steam + Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-74681095387625681182007-05-28T23:41:00.000-04:002007-05-28T23:41:00.000-04:00Just hope Smolin's Cosmic Selection is quickly pro...Just hope Smolin's Cosmic Selection is quickly proven wrong, otherwise this black hole could very well spawn offspring. ;-) And before we know it, there'll be baby black holes invading planet Earth!<BR/><BR/>Thus, our only hope for survival would be to devise a weapon containing eternal inflation. So then we can aim this high-powered weapon at these black holes of Martian descent blasting them Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-9155452826141955242007-05-28T22:16:00.000-04:002007-05-28T22:16:00.000-04:00OK, let's stay with both feet firmly on the ground...OK, let's stay with both feet firmly on the ground of reason and common sence.<BR/><BR/>1)it is a cavern.<BR/>2) what made it cave in? (where is the displaced material)<BR/>3)how stable are the outer edges, (is it safe to get near?)<BR/>4) is this the best location to search for water on Mars?<BR/><BR/>The seatch for water should be the only reason for spending (half a day's Irak-war worth of)Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-52365947682568439342007-05-28T21:06:00.000-04:002007-05-28T21:06:00.000-04:00If you look in detail at Emily Lakdawalla's Planet...If you look in detail at Emily Lakdawalla's Planetary Society weblog, there are several of these 'holes', and they are all relatively close to each other (they are all nearby in lat. & long.). Weird! I'd like to go explore that; who know what one will find down there!<BR/><BR/>changchoAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-87283357207477855372007-05-28T19:11:00.000-04:002007-05-28T19:11:00.000-04:00can one measure the temperature of the black body ...<I>can one measure the temperature of the black body radiation</I><BR/><BR/>funny, I also thought that it looks like a perfect realisation of the "black body", as an old-fashioned Hohlraum ;-)... I don't know, though, whether they have suitable infrared sensors on board.. <BR/><BR/>Best, stefanstefanhttps://www.blogger.com/profile/09495628046446378453noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-64219930104697954162007-05-28T18:51:00.000-04:002007-05-28T18:51:00.000-04:00maybe it's not a cavern at all, but a wormhole ;-)...maybe it's not a cavern at all, but a wormhole ;-)Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-71495265624279237612007-05-28T18:50:00.000-04:002007-05-28T18:50:00.000-04:00weird! at first glimpse I thought the photo is con...weird! at first glimpse I thought the photo is contemporary art. can one measure the temperature of the black body radiation and find out something about the cavern (i.e. if the Martians live in there?) Best, B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.com