Search found 1570 matches

by JohnD
Fri Oct 19, 2007 5:31 pm
Forum: The Asterisk Café: Discuss Anything Astronomy Related
Topic: Hole in the clouds? What is this?
Replies: 13
Views: 4041

gordo, What spledid pics! The last on your website, in blue (moonlight?) are truely weird. But could not this be both 'natural' and the result of a passing aeroplane/ The first above appears to have a straight trail along the cloud before it goes through, and the central wisps seem to extend off in ...
by JohnD
Tue Oct 16, 2007 8:58 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Iapetus, WHITE on BLACK (APOD 19 Sep 2007)
Replies: 39
Views: 14598

We call that schoolboy humour.

Very funny,CC.

John
by JohnD
Tue Oct 16, 2007 1:44 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Iapetus, WHITE on BLACK (APOD 19 Sep 2007)
Replies: 39
Views: 14598

Re: Iapetus shape and composition theory

How about another far-fetched theory ... On object struck it with such force that it penetrated the surface and lodged itself somewhere near the core of the planet. Large impactors usually strike with so much energy that they splash, rather than shatter, let alone stay intact. Small meteorites can ...
by JohnD
Tue Oct 09, 2007 9:06 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Iapetus, WHITE on BLACK (APOD 19 Sep 2007)
Replies: 39
Views: 14598

The ESA site has just posted a long piece on the lastest images and opinion from the Cassini project. That is that the surface is black-on-white and not the other, and that the black, heat absorbtive surface is driving a process of 'thermal segregation' to exagerrate the contrast. See: http://www.es...
by JohnD
Sat Oct 06, 2007 8:25 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: 50th Anniversary of Sputnik (APOD 04 Oct 2007)
Replies: 7
Views: 2576

My apologies, "In 1954, amateur astronomers around the world were able to detect the radio signals emitted by Sputnik. But the Lovell telescope was the only instrument in the West able to track the beachball-sized metal ball's booster rocket through radar" From http://www.iht.com/articles/...
by JohnD
Fri Oct 05, 2007 9:23 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Saguaro Moon (APOD 26 Sep 2007)
Replies: 21
Views: 8298

Any of you paranoid sceptics looked at the site of origin of this pic? Collection of Moon pics by Stefan Seip (I think I got that right) at http://www.photomeeting.de/astromeeting/_index.htm (Click on 'Moon') The image right next to the Saguaro one is even spookier. Full Moon, surrounded by stars - ...
by JohnD
Fri Oct 05, 2007 9:12 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: 50th Anniversary of Sputnik (APOD 04 Oct 2007)
Replies: 7
Views: 2576

cc, Really? You could get a signal from the Apollo misisons on your DiY receiver? Wow! "Respect"! I've never heard before that as evidence for the truth of the Moon Missions. Not that I am an unbeliever, but couldn't those signals have been repeated from a mere transceiver soft-landed on t...
by JohnD
Thu Sep 20, 2007 5:56 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Iapetus, WHITE on BLACK (APOD 19 Sep 2007)
Replies: 39
Views: 14598

A Thousand Curses!
You have penetrated my disguise.
Cower, Earthlings, before the might of my Intergalactic Paint Gun.

Jong the Magnificent

Image
[/img]
by JohnD
Thu Sep 20, 2007 6:50 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Iapetus, WHITE on BLACK (APOD 19 Sep 2007)
Replies: 39
Views: 14598

Excellent, geckzilla! To add to your observations, without being able to construct such useful annotated pictures, there are some further markings, top left on the photo, that look exactly as if someone had spattered the globe with streaks of paint from a brush, or spatula. Not that they have, but t...
by JohnD
Wed Sep 19, 2007 4:04 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Iapetus, WHITE on BLACK (APOD 19 Sep 2007)
Replies: 39
Views: 14598

More pics from the recent flyby at http://ciclops.org//view_media.php?id=17290 This one shows a most puzzling picture. As it appears on the web, the craters appear as mounds, but if you invert it, or 'flip both', they appear as craters. In either case, a material apperas to be coating elevations and...
by JohnD
Wed Sep 19, 2007 3:44 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Iapetus, WHITE on BLACK (APOD 19 Sep 2007)
Replies: 39
Views: 14598

Geckzilla, A most interesting approach! But not one that convinces me, that the black covers the white. In the picture you reversed, the dark terrain is heavily and sharply edged with craters. The white is featureless, implying that it is more recent and covers the dark. Of course, the lack of featu...
by JohnD
Tue Sep 18, 2007 11:41 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Space walk - forbidden directions? (APOD 16 Sep 2007)
Replies: 22
Views: 8310

Just the simple physics of motion JohnD. Try to dock a sail boat under sail at a dock on a flowing river and you will understand a more complex concept of motions. :P I know EXACTLY what you mean, cc! If you can't get the jib to go across at the right moment- disaster looms! Fortunately for astrona...
by JohnD
Tue Sep 18, 2007 11:36 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Tungurahua eruption.
Replies: 11
Views: 4466

Splendid, dramatic photo!

Having just watched the 'Lord of the Rings' triology again as it was transmitted on terrestrial UK Tv for the first time, this could be the model for Mt.Doom!

John
(I know - it's a story!)
by JohnD
Mon Sep 17, 2007 7:06 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Space walk - forbidden directions? (APOD 16 Sep 2007)
Replies: 22
Views: 8310

Thank you ial13, Your explanation reminded me of a Larry Niven mantra from the Integral Trees, which goes something like "Down takes you out, out takes you up, up takes you back, back takes you down." I never understood it then. But searching for that lead me to an old thread on BAUT: http...
by JohnD
Sun Sep 16, 2007 5:47 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: A Path into Victoria Crater on Mars (APOD 04 Sep 2007)
Replies: 15
Views: 5330

It's got beyond that, Orin.
Opportunity has completely entered to the crater!

Keep an eye on this website for up to date news, rather than the johnny come lately news desks.
http://marsrovers.jpl.nasa.gov/gallery/ ... 0913a.html

John
by JohnD
Sun Sep 16, 2007 4:18 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Space walk - forbidden directions? (APOD 16 Sep 2007)
Replies: 22
Views: 8310

That's not the scenario that I thought William meant, Andy. To have the Shuttle go off ahead of you and then come around on another orbit, in effect doing one more owrbit that you have, wouldn't you have you be going a LOT slower and LOT further out from the original orbit, or else to wait a very lo...
by JohnD
Sun Sep 16, 2007 3:13 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Space walk - forbidden directions? (APOD 16 Sep 2007)
Replies: 22
Views: 8310

Thank you, William! But why do they drift back again? Left outside, would the hapless astronaut then drift inwards of the shuttle and back? In other words, they have distorted their own orbit to one more eccentrc than the Shuttles's? Ah! You said 45 minutes. That's half of a 90 minute Shutte orbit (...
by JohnD
Sun Sep 16, 2007 9:30 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Space walk - forbidden directions? (APOD 16 Sep 2007)
Replies: 22
Views: 8310

Space walk - forbidden directions? (APOD 16 Sep 2007)

All, APOD 16th September 2007 Great picture of an astronaut totally free of the Shuttle and 100meters away. What an experience! But I see that he has moved away 'to the side', not above or below the Shuttle. Would these be 'forbidden directions'? Because; If he moved straight up, his orbit would be ...
by JohnD
Sun Sep 16, 2007 8:54 am
Forum: The Asterisk Café: Discuss Anything Astronomy Related
Topic: Cassini imags of Lapetus.
Replies: 16
Views: 4876

OK, cc, I'll take that as a refusual to back up your assertion with evidence. Or an inability to do so. I'm sorry, cc, but this is a scientific website, and if you propose a theory, you must show the evidence and defend your thesis. Just saying you are too busy right now and anyway, a fool can see t...
by JohnD
Sat Sep 15, 2007 12:57 pm
Forum: The Asterisk Café: Discuss Anything Astronomy Related
Topic: Cassini imags of Lapetus.
Replies: 16
Views: 4876

Looking at something with a human eye notoriously produces such artefacts, as our eyes/brains have developed to see patterns. And while Richard Hoagland may have worked for NASA at one time, he was already describing "Cities on Mars" twenty years ago. This description amply demonstrates th...
by JohnD
Sat Sep 15, 2007 7:48 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Iapetus: Black and white? White and black? (APOD 14 Sep 07)
Replies: 20
Views: 7438

brian,
Perhaps you would like to consider the thesis in the post immediately before yours?
John
by JohnD
Fri Sep 14, 2007 9:36 pm
Forum: The Asterisk Café: Discuss Anything Astronomy Related
Topic: Cassini imags of Lapetus.
Replies: 16
Views: 4876

Well lets just say that they obviously wanted to show off the lineal alignment of the craters, , hmmmmm 8) I think you should demonstrate this lineal alignment, cc. Please post a picture with the lines drawn. And show that it is more than joining the dots in a random scatter. See: http://en.wikiped...
by JohnD
Fri Sep 14, 2007 9:33 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Iapetus: Black and white? White and black? (APOD 14 Sep 07)
Replies: 20
Views: 7438

I can't see how this black material can be from secondary impacts, bma. While in the centreof the image, the blackness is to one side of a larger crater, as if drifted, it is dead centre of others to top left of inverted image, and dotted around the interior of the large uppermost crater. Don't look...
by JohnD
Wed Sep 12, 2007 12:30 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Scorpio/Scorpius (APOD 11 Sep 2007)
Replies: 12
Views: 5981

The correct, anatomical name for your thumb is 'pollux'. But you call it a thumb. A surgeon would too, though they would use 'pollucis' (of the thumb) of the muscles that move the thumb. It's all in the context, don't you think? In a formal paper, nothing other than 'Scorpius' will do, but unless th...
by JohnD
Wed Sep 12, 2007 12:20 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Six Rainbows Across Norway... (APOD 12 Sep 2007)
Replies: 22
Views: 10068

I've seen a 'reflected' rainbow, without it's primary. The bow was diffuse and distorted, but distinct. It looked as if the moor beyond was smeared with colour. Such reflected bows could be termed 'virtual' as, like an ordinary bow, they are centered on an antisolar point, and are 42 degrees from th...