MESSENGER Mercury Updates.

MeteorWayne · Oct 7, 2008

Replying to: <DIV CLASS='Discussion_PostQuote'>Hi Wayne, is that book still in print? Can I have the ISBN please. Posted by 3488</DIV> I doubt it, I bought it from the US gummint 20 or more years ago. However, I will get the ISBN so you can look. I'll give more details when I drag it out from below the 48 "must do today" daily piles

<div class="Discussion_UserSignature"> But the Krell forgot one thing John. Monsters. Monsters from the Id. I really, really, really, really miss the "first unread post" function </div>

MeteorWayne · Oct 8, 2008

Below are two views of the double ringed crater Vivaldi. The first was taken in January at sunset. The second just days ago at sunrise. <img src="http://sitelife.space.com/ver1.0/Content/images/store/0/9/00ea5463-dcca-4320-b9e2-4d530c5d6464.Medium.png" alt="" /> <img src="http://sitelife.space.com/ver1.0/Content/images/store/9/3/990378df-1cc7-4c9d-b30a-c3101355a427.Medium.png" alt="" /> <div class="Discussion_UserSignature"> But the Krell forgot one thing John. Monsters. Monsters from the Id. I really, really, really, really miss the "first unread post" function </div>

MeteorWayne · Oct 8, 2008

The WAC snapped this image just 8 minutes and 47 seconds after the MESSENGER spacecraft passed 200 kilometers (124 miles) above Mercury’s surface, its closest distance to the planet during the mission’s second Mercury flyby. The closest approach occurred over the dark night side of Mercury <img src="http://sitelife.space.com/ver1.0/Content/images/store/14/7/de193157-6395-487b-8761-a2a48b2f2dee.Medium.png" alt="" /> <div class="Discussion_UserSignature"> But the Krell forgot one thing John. Monsters. Monsters from the Id. I really, really, really, really miss the "first unread post" function </div>

3488 · Oct 8, 2008

Replying to: <DIV CLASS='Discussion_PostQuote'>The WAC snapped this image just 8 minutes and 47 seconds after the MESSENGER spacecraft passed 200 kilometers (124 miles) above Mercury’s surface, its closest distance to the planet during the mission’s second Mercury flyby. The closest approach occurred over the dark night side of Mercury Posted by MeteorWayne</DIV>Thank you very much Wayne for the updates.I am just very quickly chiming in. I will return later when I have time.Equatorial Lava Plains, inbound on previously unimaged terrain.North is to the right, West is up. <img src="http://sitelife.space.com/ver1.0/Content/images/store/0/0/00cefa66-0792-4319-b03c-39f8dd86a756.Medium.png" alt="" />Andrew Brown. <div class="Discussion_UserSignature"> "I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before". Linda Morabito on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.http://www.launchphotography.com/ http://anthmartian.googlepages.com/thisislandearthhttp://web.me.com/meridianijournal </div>

MeteorWayne · Oct 8, 2008

Replying to: <DIV CLASS='Discussion_PostQuote'>Thank you very much Wayne for the updates.I am just very quickly chiming in. I will return later when I have time.Equatorial Lava Plains, inbound on previously unimaged terrain.North is to the right, West is up.Andrew Brown. Posted by 3488</DIV> I find that an eerily fascinating view...could be a new desktop! <div class="Discussion_UserSignature"> But the Krell forgot one thing John. Monsters. Monsters from the Id. I really, really, really, really miss the "first unread post" function </div>

halcyondays · Oct 8, 2008

Replying to: <DIV CLASS='Discussion_PostQuote'>Thank you very much Wayne for the updates.I am just very quickly chiming in. I will return later when I have time.Equatorial Lava Plains, inbound on previously unimaged terrain.North is to the right, West is up.Andrew Brown. Posted by 3488</DIV>What might the white/shiny 'stuff' be to the far upper right of the image ?  Is it just a lighting effect, solar reflection, or something (rays ?) actually there on the griund ?    Thanks.

3488 · Oct 8, 2008

Replying to: <DIV CLASS='Discussion_PostQuote'>What might the white/shiny 'stuff' be to the far upper right of the image ?  Is it just a lighting effect, solar reflection, or something (rays ?) actually there on the griund ?    Thanks.  Posted by halcyondays</DIV>Hi halcyondays,Yes that 'sheen' is quite something & to me that is very significant, It is indeed a lighting effect, usually caused by sunlight shining on a fairly smooth surface.To me, together with the general lack of impact craters in the shiny area makes me think that this lava may not be as old as much of the surface of Mercury. By terrestrial standards, it is old, but certainly not going back to the early days. This area IMO has been volcanicaly active till fairly 'recently'.I will suggest to the MESSENGER team to include this area as a point of focus for the September 2009 Encounter #3. I assume that this is the highest resolution image of this area during this encounter???Replying to: <DIV CLASS='Discussion_PostQuote'>I find that an eerily fascinating view...could be a new desktop! Posted by MeteorWayne</DIV>It is indeed Wayne, that view is an absolute cracker. I think that scene is evidence of volcanic avtivity, maybe not to long ago. Still a long time by standards of Earth & especially Io, but is not ancient, early solar system period volcanism either. The sheen, lack of major cratering within the 'shiny' area, lava embayed craters & the fact Mercury is only approx 0.34 AU from the gravity well of the entire solar system, which IMO puts Mercury in the firing line of impactors from further out in the solar system, makes me think, that this area is not 'old' as I explained in my answer to halcyondays.Andrew Brown. <div class="Discussion_UserSignature"> "I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before". Linda Morabito on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.http://www.launchphotography.com/ http://anthmartian.googlepages.com/thisislandearthhttp://web.me.com/meridianijournal </div>

3488 · Oct 8, 2008

Mercury, filling in the gaps.Mariner 10 imaged most of one hemisphere, aside from one annoying finger shaped area covering approx 3% of said hemisphere. MESSENGER has now filled most of it. <img src="http://sitelife.space.com/ver1.0/Content/images/store/2/0/f29e9971-5b57-4c5e-b0ee-f5ab18cdf2f7.Medium.jpg" alt="" />  Andrew Brown.  <div class="Discussion_UserSignature"> "I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before". Linda Morabito on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.http://www.launchphotography.com/ http://anthmartian.googlepages.com/thisislandearthhttp://web.me.com/meridianijournal </div>

Mee_n_Mac · Oct 8, 2008

Replying to: <DIV CLASS='Discussion_PostQuote'>The sheen, lack of major cratering within the 'shiny' area, lava embayed craters & the fact Mercury is only approx 0.34 AU from the gravity well of the entire solar system, which IMO puts Mercury in the firing line of impactors from further out in the solar system, makes me think, that this area is not 'old' as I explained in my answer to halcyondays.Andrew Brown. Posted by 3488</DIV> As you say Mercury is closer to the Sun and so potential impactors are running faster there than they are out by us.  I wonder what percentage were "crust busters" as a result of this and the thin crust ?  Would this have effected the vulcanism/outflow (back when) to any noticable degree ? <div class="Discussion_UserSignature"> -----------------------------------------------------Ask not what your Forum Software can do do on you,Ask it to, please for the love of all that's Holy, STOP ! </div>

efron_24 · Oct 8, 2008

Replying to: <DIV CLASS='Discussion_PostQuote'>I find that an eerily fascinating view...could be a new desktop! Posted by MeteorWayne</DIV> That is indeed an amazing view The  Desktop image here is of  course the color photo of Phoenix that shows the Red landscape with frostbut this is indeed a facsinating image.. there seem to be a lot of lava flows thereit took me awhile to see what the black dots were.. It looked like rocks.. but are craters <div class="Discussion_UserSignature"> </div>

efron_24 · Oct 8, 2008

Replying to: <DIV CLASS='Discussion_PostQuote'>Hi halcyondays,Yes that 'sheen' is quite something & to me that is very significant, It is indeed a lighting effect, usually caused by sunlight shining on a fairly smooth surface.To me, together with the general lack of impact craters in the shiny area makes me think that this lava may not be as old as much of the surface of Mercury. By terrestrial standards, it is old, but certainly not going back to the early days. This area IMO has been volcanicaly active till fairly 'recently'.I will suggest to the MESSENGER team to include this area as a point of focus for the September 2009 Encounter #3. I assume that this is the highest resolution image of this area during this encounter???It is indeed Wayne, that view is an absolute cracker. I think that scene is evidence of volcanic avtivity, maybe not to long ago. Still a long time by standards of Earth & especially Io, but is not ancient, early solar system period volcanism either. The sheen, lack of major cratering within the 'shiny' area, lava embayed craters & the fact Mercury is only approx 0.34 AU from the gravity well of the entire solar system, which IMO puts Mercury in the firing line of impactors from further out in the solar system, makes me think, that this area is not 'old' as I explained in my answer to halcyondays.Andrew Brown. Posted by 3488</DIV> Aha.. I should have gone to page 6 instantly

so it are indeed lava flows.. GREATIf I understood it well.. the crust of Mercury is immense thick.. it must still have been ages ago since that lava made it to the planes.. and ice is or course out of any question with the temperatures over there <div class="Discussion_UserSignature"> </div>

3488 · Oct 8, 2008

Replying to: <DIV CLASS='Discussion_PostQuote'> Aha.. I should have gone to page 6 instantly

so it are indeed lava flows.. GREATIf I understood it well.. the crust of Mercury is immense thick.. it must still have been ages ago since that lava made it to the planes.. and ice is or course out of any question with the temperatures over there Posted by efron_24</DIV>Hi Chris,Yes the crust of Mercury is indeed thought to be very thick now. But remember it has not always been so as the rupes & scarps testify. Mee_n_Mac is correct. Impactors in that part of the solar system will be very fast moving & some almost certainly would have been in retrograde orbits, travelling at least as fast as Mercury would be in the prograde orbit or nearly meeting at a speed that would cover the distance from the Earth to the Moon in one hour!!!!! There are at least two Mercury Oribit crossing asteroids, 1566 Icarus, 3200 Phaethon & 5786 Talos (shame MESSENGER could not pass closely to any). Such impacts with even moderately sized impactors with dig deep. Imaging Mercury lets say running into asteroid 951 Gaspra  (17 x 11 KM) in a retrograde orbit. How big a crater would that make. How deep would it go? I have identified that the real shiny area is indeed circular.My blow up & crop here. <img src="http://sitelife.space.com/ver1.0/Content/images/store/8/8/c83f609b-514a-4df8-a8bc-71016b7121e3.Medium.jpg" alt="" /> Andrew Brown.  <div class="Discussion_UserSignature"> "I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before". Linda Morabito on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.http://www.launchphotography.com/ http://anthmartian.googlepages.com/thisislandearthhttp://web.me.com/meridianijournal </div>

efron_24 · Oct 8, 2008

Replying to: <DIV CLASS='Discussion_PostQuote'>Hi Chris,Yes the crust of Mercury is indeed thought to be very thick now. But remember it has not always been so as the rupes & scarps testify. Mee_n_Mac is correct. Impactors in that part of the solar system will be very fast moving & some almost certainly would have been in retrograde orbits, travelling at least as fast as Mercury would be in the prograde orbit or nearly meeting at a speed that would cover the distance from the Earth to the Moon in one hour!!!!! There are at least two Mercury Oribit crossing asteroids, 1566 Icarus & 3200 Phaethon (shame MESSENGER could not pass closely to either). Such impacts with even moderately sized impactors with dig deep. Imaging Mercury lets say running into asteroid 951 Gaspra  (17 x 11 KM) in a retrograde orbit. How big a crater would that make. How deep would it go? I have identified that the real shiny area is indeed circular.My blow up & crop here. Andrew Brown.  Posted by 3488</DIV> Circular and not alone..there is more of that shiny material overthere.could it be minerals ? <div class="Discussion_UserSignature"> </div>

3488 · Oct 9, 2008

213 KM wide Vivaldi Crater at dawn & dusk Encounters 1 & 2 respectively. <img src="http://sitelife.space.com/ver1.0/Content/images/store/11/15/dbf2bf44-f156-48c0-9fa5-f53a88c14741.Medium.jpg" alt="" />  Andrew Brown.  <div class="Discussion_UserSignature"> "I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before". Linda Morabito on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.http://www.launchphotography.com/ http://anthmartian.googlepages.com/thisislandearthhttp://web.me.com/meridianijournal </div>

3488 · Oct 9, 2008

62 KM wide Kuiper Crater. <a href="http://sitelife.space.com/ver1.0/Forums/#" title="Click to view a larger photo" onclick="return gSiteLife.LoadForumPage('ForumImage', 'plckPhotoId', '38729941-4450-43b2-ad27-3ee2e1b02462', 'plckRedirectUrl', gSiteLife.EscapeValue(window.location.href));"><img src="http://sitelife.space.com/ver1.0/Content/images/store/8/13/38729941-4450-43b2-ad27-3ee2e1b02462.Medium.png" alt="" /> </a>Andrew Brown. <div class="Discussion_UserSignature"> "I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before". Linda Morabito on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.http://www.launchphotography.com/ http://anthmartian.googlepages.com/thisislandearthhttp://web.me.com/meridianijournal </div>

3488 · Oct 9, 2008

110 KM wide ray crater on newly imaged terrain, post periherm. <img src="http://sitelife.space.com/ver1.0/Content/images/store/5/0/057b7ca2-492b-47de-90ae-958ec00fbfea.Medium.png" alt="" />Andrew Brown. <div class="Discussion_UserSignature"> "I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before". Linda Morabito on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.http://www.launchphotography.com/ http://anthmartian.googlepages.com/thisislandearthhttp://web.me.com/meridianijournal </div>

MeteorWayne · Oct 9, 2008

Replying to: <DIV CLASS='Discussion_PostQuote'>110 KM wide ray crater on newly imaged terrain, post periherm.Andrew Brown. Posted by 3488</DIV> Wanted to point out that this crater is the source of the planetwide rays seen in the full disk image. <div class="Discussion_UserSignature"> But the Krell forgot one thing John. Monsters. Monsters from the Id. I really, really, really, really miss the "first unread post" function </div>

efron_24 · Oct 9, 2008

Replying to: <DIV CLASS='Discussion_PostQuote'>Wanted to point out that this crater is the source of the planetwide rays seen in the full disk image. Posted by MeteorWayne</DIV>It indeed looks relatively fresh... strange in fact as there is no wind or water erotion..Must have been a big rock, but older theories of moons that might have slammed into this planet now seem less likely as we see more and more of Mercury.   <div class="Discussion_UserSignature"> </div>

efron_24 · Oct 9, 2008

If one would walk on Mercury with a good space suit ... what would one see of these white rays ?It will not be meters thick I think.. so no height differences in the terrain i suspectbut would it be powerly material that you can kick up with your shoes ?Can anyone take a quess what this would be like <div class="Discussion_UserSignature"> </div>

3488 · Oct 9, 2008

Replying to: <DIV CLASS='Discussion_PostQuote'>Wanted to point out that this crater is the source of the planetwide rays seen in the full disk image. Posted by MeteorWayne</DIV>Thanks Wayne,I should have mentioned that but I forgot, duh <img src="http://sitelife.space.com/ver1.0/Content/images/store/7/11/7798cc81-fabb-4a70-abc3-ec2d4723eec6.Medium.gif" alt="" />  <img src="http://sitelife.space.com/ver1.0/Content/images/store/2/9/92f510c0-3156-48f1-b995-e81e169ef321.Medium.gif" alt="" />   <img src="http://sitelife.space.com/ver1.0/Content/images/store/3/6/c368b6bb-4d37-4325-9620-8f0805d481f3.Medium.gif" alt="" />   <img src="http://sitelife.space.com/ver1.0/Content/images/store/6/2/f6ec95de-353a-419e-a21c-a1e65846ec4b.Medium.gif" alt="" />. I have cropped & enlarged a portion of that image with the 110 KM crater.The crater appears to be much like Kuiper of even Copenrnicus on the Moon. Terraced, with as Wayne says in this case a ray system of ejecta that appears to dominate that side of Mercury. <img src="http://sitelife.space.com/ver1.0/Content/images/store/9/11/c9e10ed5-630c-4a93-8b6b-03a31b3309c8.Medium.jpg" alt="" /> # Andrew Brown. <div class="Discussion_UserSignature"> "I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before". Linda Morabito on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.http://www.launchphotography.com/ http://anthmartian.googlepages.com/thisislandearthhttp://web.me.com/meridianijournal </div>

3488 · Oct 9, 2008

Replying to: <DIV CLASS='Discussion_PostQuote'>It indeed looks relatively fresh... strange in fact as there is no wind or water erotion..Must have been a big rock, but older theories of moons that might have slammed into this planet now seem less likely as we see more and more of Mercury.  Posted by efron_24[/QUOTE]Hi Chris,Yes indeed. That creater IS young on the hermeological time scale. Ejecta & the craters themselves over time darken as radiation & the surface regolith is slowly 'gardened ' by micrometeoroid impacts. With Mercury as Wayne said earlier, the actual cratering rate & I would also expect in conjunction with that, the micrometeoroid impact rate is poorly known, due to Mercury being on average only 0.34 AU from the gravity well of the the Solar System, namely the Sun. Also does solar energy this close in (currently on Mercury just over 11 KW per square metre or approx nine times that on Earth or the Moon), affect the micrometeoroid impact rate? Is it less on Mercury than the Moon, or Phobos, or 1 Ceres, etc? or could it be more due to the Sun's gravity, more than enough to counteract the radiation pressure?Wayne I would expect will know very much more than I do on this.  We do know that particles can survive this close & even closer to the Sun than this due to the Geminid meteor stream left behind the now extinct comet that is now asteroid 3200 Pheathon. Once again, Wayne will know much more than I do on this.Also I agree with you that there appears to be no evidence of impacted former moons of Mercury. We cannot discount that Mercury may have had small moons like Phobos, Deimos or Dactyl (the 1.5 KM wide moon of main belt Asteroid 243 Ida) at some time that could have impacted, but certainly no large ones. We have now seen enough of Mercury in sufficient detail now to rule that out. It was something I was looking for myself, as well as more volcanoes, though as yet, there have not been enough NAC frames released for me to study, but I think we can discount impacted former moons unless they were very small, certainly less than a few KM across. Replying to: <DIV CLASS='Discussion_PostQuote'>If one would walk on Mercury with a good space suit ... what would one see of these white rays ?It will not be meters thick I think.. so no height differences in the terrain i suspectbut would it be powerly material that you can kick up with your shoes ?Can anyone take a quess what this would be like Posted by efron_24</DIV>Yes I think you are spot on with this Chris. The ejecta blanket close to the crater will be deep, certainly many metres in depth, maybe even a few hundred metres in depth. But further away, that depth will decrease as obviously less material will travel further. Although those rays look impressive further away & dominating that side of Mercury, really they are very superficial, maybe for the most part, millimetres or even shallower than that. An astronaut would certainly be able to kick it clear with space boots. I suspect at surface level, it may look like frost, looking not too unlike the frost that Phoenix has seen on Mars, except in this case, it will be rock dust (the daytime surface temperature of approx +420 C here & lack of atmosphere will not allow for frost, though at dawn even on the equator, the temperature is approx -186 C, similar to the moons of Saturn, but lack of atmosphere would IMO still rule out frost). For the most part except near the actual crater, there will be no elevation difference from the actual surface.Andrew Brown.  <div class="Discussion_UserSignature"> "I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before". Linda Morabito on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.http://www.launchphotography.com/ http://anthmartian.googlepages.com/thisislandearthhttp://web.me.com/meridianijournal </div>

3488 · Oct 9, 2008

550 KM wide area with a dark holoed 100 KM wide crater near limb post periherm. <img src="http://sitelife.space.com/ver1.0/Content/images/store/1/7/11389257-b72e-455e-a71c-d5f9b25798d8.Medium.jpg" alt="" />  Crop & enlargement of 100 KM wide dark haloed crater. Not sure if it darkened glass from the impact melt of even if it is marial type lava? Spectral data obtained from the encounter should be able to reveal the nature of this dark material. <img src="http://sitelife.space.com/ver1.0/Content/images/store/12/14/3ce3e6f6-021b-4fb7-9e7e-75d20f721d09.Medium.jpg" alt="" />  Andrew Brown.  <div class="Discussion_UserSignature"> "I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before". Linda Morabito on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.http://www.launchphotography.com/ http://anthmartian.googlepages.com/thisislandearthhttp://web.me.com/meridianijournal </div>

3488 · Oct 10, 2008

A few images I have worked on.Crop & enlargement of South east quadrant of the receding gibbous Mercury. <img src="http://sitelife.space.com/ver1.0/Content/images/store/10/15/9a7e6c0e-0515-4751-bf6a-45c959df4460.Medium.jpg" alt="" />http://my1.photodump.com/uploads/3488/9c85895141a52462.bmp<a href="http://my1.photodump.com/uploads/3488/9c85895141a52462.bmp" target="_blank">Crop & contrast enhancement of the inbound view of the Southern Hemisphere basin on Mercury.http://www.photodump.com/3488/9c85895141a52462.bmp.html</a> <img src="http://sitelife.space.com/ver1.0/Content/images/store/6/3/b6c0f605-0333-4626-b34e-9c8dc81bfc89.Medium.jpg" alt="" /> Crop of Vivaldi Crater.Contrast & brightness enhanced to show detail within the 213 KM wide crater under the low dawn Sun. Worked quite well by the looks of it. The lava flooded floor shows very well as do the westward pointing shadows from the rims. <img src="http://sitelife.space.com/ver1.0/Content/images/store/11/7/3b393a47-5dcd-4434-a78d-b0f1a3fab703.Medium.jpg" alt="" />  Andrew Brown. <div class="Discussion_UserSignature"> "I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before". Linda Morabito on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.http://www.launchphotography.com/ http://anthmartian.googlepages.com/thisislandearthhttp://web.me.com/meridianijournal </div>

3488 · Oct 10, 2008

A cliff runs through it.On the small finger of terrain in the northern hemisphere, missed by Mariner 10 on the side of the First Rock from the Sun Mariner 10 did image a very large scarp was missed. <img src="http://sitelife.space.com/ver1.0/Content/images/store/3/15/437c8b51-52f9-45be-8f52-7df0e3bd8728.Medium.png" alt="" /> MESSENGER observes Arecibo Vallis.  <img src="http://sitelife.space.com/ver1.0/Content/images/store/1/4/71464556-4102-4ab8-a408-37f5e6f76eb7.Medium.png" alt="" />Andrew Brown. <div class="Discussion_UserSignature"> "I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before". Linda Morabito on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.http://www.launchphotography.com/ http://anthmartian.googlepages.com/thisislandearthhttp://web.me.com/meridianijournal </div>

3488 · Oct 10, 2008

Mercury through time.How impact craters degrade over time. This area was imaged by Mariner 10 previously but the sun was shining from the opposite direction then. <img src="http://sitelife.space.com/ver1.0/Content/images/store/9/15/c9c0dfa9-df43-4687-afb7-40ec797280b7.Medium.png" alt="" />Andrew Brown. <div class="Discussion_UserSignature"> "I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before". Linda Morabito on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.http://www.launchphotography.com/ http://anthmartian.googlepages.com/thisislandearthhttp://web.me.com/meridianijournal </div>

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