IPB
X   Site Message
(Message will auto close in 2 seconds)

Welcome Guest ( Log In | Register )

462 Pages V  « < 152 153 154 155 156 > » 

djellison
Posted on: Jul 17 2008, 05:30 PM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1


Ahhhhh - thanks.
  Forum: MSL · Post Preview: #120938 · Replies: 157 · Views: 160952

djellison
Posted on: Jul 17 2008, 04:55 PM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1


Congratulations Mike, those text images are very promising. Sharp, vivid, no noticeable noise and an artistic amount of motion blur smile.gif

Is that a set of in-flight-calibration lights of some sort bolted on via what looks like a D9 serial port on the top right of the electronics box?

I like the 4 0's in the serial number. biggrin.gif
  Forum: MSL · Post Preview: #120936 · Replies: 157 · Views: 160952

djellison
Posted on: Jul 17 2008, 04:05 PM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1


QUOTE (ugordan @ Jul 17 2008, 04:10 PM) *
IMHO it's stretching this thread a bit too far. This is becoming nitpicking; we need to lighten up a bit!


I agree. Using that phrase isn't inaccurate - it's just a turn of phrase.

ESA's recent gaff, however, is inaccurate, and in quite a bad way.
  Forum: Chit Chat · Post Preview: #120934 · Replies: 549 · Views: 459727

djellison
Posted on: Jul 17 2008, 12:20 PM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1


I'll probably be doing it again, but in a pub in London next time.

Essentially, UMSF and my entire Mars enthusiasm is a front for my alcoholism wink.gif

  Forum: Chit Chat · Post Preview: #120919 · Replies: 28 · Views: 21724

djellison
Posted on: Jul 17 2008, 11:55 AM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1


It was this group - http://leicester.skepticsinthepub.org/ - and the talk went down very well. I think you may have the definition of skeptic inverted.
  Forum: Chit Chat · Post Preview: #120913 · Replies: 28 · Views: 21724

djellison
Posted on: Jul 17 2008, 10:41 AM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1


I'm very lucky, it seems. Helen really enjoyed the Imax film - and infact was a great 'taste test' when I tried some Mars imagery in full-dome video some months ago. She wont come to every talk I do but she'll come to any new talk, like the one I gave to a skeptics group on Tuesday.
  Forum: Chit Chat · Post Preview: #120907 · Replies: 28 · Views: 21724

djellison
Posted on: Jul 17 2008, 10:37 AM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1


NH got off the bad with barely a squeek from the anti-RTG crowd. I'd expect the same from MSL really.

Doug
  Forum: Past and Future · Post Preview: #120906 · Replies: 579 · Views: 574619

djellison
Posted on: Jul 17 2008, 08:23 AM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1


Some words on img2png and the MDIS imagery would be good- - which tags we should be using for calibrated results.

D

  Forum: Messenger · Post Preview: #120894 · Replies: 48 · Views: 126804

djellison
Posted on: Jul 17 2008, 07:18 AM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1


I agree - it's just a turn of phrase - but ' Sees the Universe in a new light' would perhaps be better.

ESA have pulled a blinder - as Phil Stooke pointed out...
http://www.esa.int/SPECIALS/Mars_Express/SEMVGAWIPIF_0.html
"As it flies by at a distance of 97 km, Mars Express will image areas of Phobos that have never been glimpsed before"

WRONG. It's been glimpsed in full by the Viking orbiters. No excuses for that sort of misinformation.
  Forum: Chit Chat · Post Preview: #120892 · Replies: 549 · Views: 459727

djellison
Posted on: Jul 16 2008, 10:15 PM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1


Technically, I think Carl has been honored in that way already with the renaming of the Pathfinder Lander to the Sagan Memorial Station.
  Forum: MSL · Post Preview: #120870 · Replies: 177 · Views: 121762

djellison
Posted on: Jul 16 2008, 09:50 PM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1


See - you would fit right in!
  Forum: Chit Chat · Post Preview: #120865 · Replies: 28 · Views: 21724

djellison
Posted on: Jul 16 2008, 07:38 PM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1


'Just going into the shed to do some forum stuff'

'Oh. OK'

smile.gif

To be fair - Helen will happily come along to most of the talks I do, and seems to enjoy them (no matter how beardy and wierd the audience might be smile.gif )

D
  Forum: Chit Chat · Post Preview: #120835 · Replies: 28 · Views: 21724

djellison
Posted on: Jul 16 2008, 05:22 PM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1



I'm afraid the line you're taking is bordering on pseudoscience. I would suggest that other fora are probably better suited to the discussion you're after.
  Forum: Phoenix · Post Preview: #120818 · Replies: 11 · Views: 14091

djellison
Posted on: Jul 16 2008, 04:05 PM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1


QUOTE (Steve39 @ Jul 16 2008, 04:44 PM) *
The images from the rover sites could be explained by fines being expelled by subsurface gas that could also be the source of planetary water vapor in the northern hemisphere of Mars.


Could you go into more detail here - we have two quite different landing sites with Meridiani and Gusev. Very different materials structured in rather different ways. Conretions, layering, cross bedding, sulphates, vugs and so on. How does what you propose, explain those features.

Doug
  Forum: Phoenix · Post Preview: #120808 · Replies: 11 · Views: 14091

djellison
Posted on: Jul 16 2008, 07:47 AM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1


Unjustified rant, and replies to it - deleted. If people wish to debate the rules or the application of them, send me a private message. This thread is not the place.
  Forum: Phoenix · Post Preview: #120779 · Replies: 405 · Views: 222848

djellison
Posted on: Jul 14 2008, 07:39 PM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1


QUOTE (slinted @ Jul 14 2008, 05:37 PM) *
I even left in the rainbow of CCD bleed


And it's very pretty smile.gif
  Forum: Phoenix · Post Preview: #120673 · Replies: 60 · Views: 87904

djellison
Posted on: Jul 14 2008, 07:38 PM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1


Actually the Eee PC's are on about the same performance as that celeron. They're rolling out new Eee's with the Intel Atom chip in them, but I don't know how powerfull that is.


Doug
  Forum: Chit Chat · Post Preview: #120672 · Replies: 20 · Views: 17294

djellison
Posted on: Jul 14 2008, 07:34 PM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1


QUOTE (dvandorn @ Jul 14 2008, 08:27 PM) *
Just exactly how much sample do you expect to return to Earth with a MAV that weighs, grand total with sample container and fuel, 100 kg?


Typical figures quoted are about 1kg
  Forum: Past and Future · Post Preview: #120670 · Replies: 579 · Views: 574619

djellison
Posted on: Jul 14 2008, 07:22 AM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1


The mirror will survive, but that's about it.

Doug
  Forum: Manned Spaceflight · Post Preview: #120622 · Replies: 25 · Views: 67069

djellison
Posted on: Jul 13 2008, 08:49 PM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1


There's no need to fill the UMSF server by downloading and then attaching all the Phoenix imagery in question - simply provide links to it at the Phoenix website.
  Forum: Phoenix · Post Preview: #120606 · Replies: 60 · Views: 87904

djellison
Posted on: Jul 13 2008, 06:47 PM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1


QUOTE (John Whitehead @ Jul 13 2008, 06:16 PM) *
Has anyone met a planetary scientist who finds propulsion systems to be interesting?


Has anyone met a propulsion engineer who finds mossbauer spectra interesting?


  Forum: Past and Future · Post Preview: #120599 · Replies: 579 · Views: 574619

djellison
Posted on: Jul 13 2008, 10:17 AM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1


OK - so several orders of magnitude out smile.gif Infact, just about an order of magnitudes worth of orders of magnitude.

But still no in the realms of feasable.

A space station in orbit around the moon is a great idea ( although a romantic one - I can't actually imagine any usefull purpose for it - if you change your perspective, we're all just in a high lunar orbit right now smile.gif ) - but the ISS has never, is not nor will ever be the right tool for any other job than the one it is doing.

Doug
  Forum: Manned Spaceflight · Post Preview: #120570 · Replies: 26 · Views: 75903

djellison
Posted on: Jul 12 2008, 11:13 PM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1


Incidentally - thermally, I would expect the environment at LEO compared to anywhere else, with half the 'sky' being full of a warm blue marble, to be significantly different requiring non-trival modifications to ISS. Power wise, you've going to need twice the solar arrays if you take it to Mars. We're 4 months from Zarya being 10 years old. Mir lasted 14 years as a crewed vehicle. The author of that article has written a book I once flicked through. I find it hard to believe it's the same guy.

Doug
  Forum: Manned Spaceflight · Post Preview: #120537 · Replies: 26 · Views: 75903

djellison
Posted on: Jul 12 2008, 11:07 PM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1


"There are good answers to all these objections."

There are not.

"How likely is any of this to happen? Not very"

Thank god.

He doesn't understand one iota of the challenges involved.

419,000 kg when finished

Let's guess a conventional ( rather than months-in-the-van-allen-belts ion ) ISP - 390s

http://www.strout.net/info/science/delta-v/intro.html suggests 4.1km/sec required

You would need something like 16,000,000,000 kg of fuel. 16 MILLION tons.

A fully laden Saturn V rocket on the pad carried 2,708 tons of fuel. It had a max payload of 118 tons.

Let's go optimistic - lets say it's a 1600 ISP Ion engine.

The requirement then is just 5,000 tons. 42 Saturn V launched laden with Xenon.

Someone please check the numbers on that - they may well be orders of magnitude off - but they do, to me at least, seem to be in the right sort of 'bloody stupid idea' ball park.

The phrase ' hand waving over the details ' has never been more appropriate


  Forum: Manned Spaceflight · Post Preview: #120535 · Replies: 26 · Views: 75903

djellison
Posted on: Jul 12 2008, 07:46 PM


Founder
****

Group: Chairman
Posts: 14457
Joined: 8-February 04
Member No.: 1


- 1.5 The manned vs unmanned debate will be never ending, always heated, and it is not allowed on this forum

Three posts deleted.
  Forum: Past and Future · Post Preview: #120522 · Replies: 579 · Views: 574619

462 Pages V  « < 152 153 154 155 156 > » 

New Posts  New Replies
No New Posts  No New Replies
Hot topic  Hot Topic (New)
No new  Hot Topic (No New)
Poll  Poll (New)
No new votes  Poll (No New)
Closed  Locked Topic
Moved  Moved Topic
 

RSS Lo-Fi Version Time is now: 17th December 2024 - 07:11 AM
RULES AND GUIDELINES
Please read the Forum Rules and Guidelines before posting.

IMAGE COPYRIGHT
Images posted on UnmannedSpaceflight.com may be copyrighted. Do not reproduce without permission. Read here for further information on space images and copyright.

OPINIONS AND MODERATION
Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators.
SUPPORT THE FORUM
Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member.