Author Topic: XKCD Webcomic  (Read 23530 times)

Offline mox386

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Re: XKCD Webcomic
« Reply #20 on: 07/30/2013 11:38 pm »
http://xkcd.com/681/


This one is still my all time favorite

Offline RanulfC

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Re: XKCD Webcomic
« Reply #21 on: 07/31/2013 06:03 pm »
http://xkcd.com/681/


This one is still my all time favorite
Remember this for reference! Gravity Wells will be a plot point in "Pacific Rim-II"!

(Naaa, I don't know anything, but it makes a good PSB-reason for the "rift" being at the bottom of the Pacific Ocean :) )

Randy
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British physics, old chap. It's undignified to belch flames and effluvia all over the pad, what. A true gentlemen's orbital conveyance lifts itself into the air unostentatiously, with the minimum of spectacle and a modicum of grace. Not like our American cousins' launch vehicles, eh?

Online Chris Bergin

Re: XKCD Webcomic
« Reply #22 on: 07/31/2013 06:22 pm »
Social Media
http://xkcd.com/1239/


That's so true.

Seems they are obsessed with Google Hangouts now.
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Offline Tuts36

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Re: XKCD Webcomic
« Reply #23 on: 12/17/2014 03:18 pm »
Maybe I'll get frowned at for bringing back an oldie, but...

http://xkcd.com/1461/

Offline ugordan

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Re: XKCD Webcomic
« Reply #24 on: 12/17/2014 03:23 pm »
Maybe I'll get frowned at for bringing back an oldie, but...

http://xkcd.com/1461/

A nice touch were custom units of measurement for Atlas-Centaur and Pegasus LVs.

Offline jongoff

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Re: XKCD Webcomic
« Reply #25 on: 12/17/2014 04:37 pm »
Maybe I'll get frowned at for bringing back an oldie, but...

http://xkcd.com/1461/

A nice touch were custom units of measurement for Atlas-Centaur and Pegasus LVs.

Thanks for mentioning that--I missed it when I saw that this morning.

~Jon

Online Chris Bergin

Re: XKCD Webcomic
« Reply #26 on: 12/17/2014 04:39 pm »
Random fact about me.....I love horses. Have since I was a kid.

I also love rockets.

Thus this all pleases me! :)
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Offline the_other_Doug

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Re: XKCD Webcomic
« Reply #27 on: 12/17/2014 06:28 pm »
I also liked the rating for a Thor launcher (the precursor of the Delta family) -- one horse and three dogs!  (And the slightly less powerful Unha, at one horse and two dogs...)

Also, I happened at one time to own a 1981 Oldsmobile...
-Doug  (With my shield, not yet upon it)

Offline p51

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Re: XKCD Webcomic
« Reply #28 on: 12/17/2014 11:59 pm »
"The years forever fashion new dreams when old ones go. God pity a one-dream man."
-Robert Goddard

Offline Nilof

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Re: XKCD Webcomic
« Reply #29 on: 01/12/2015 11:48 pm »
New XKCD what-if on swimming pools on the moon:

http://what-if.xkcd.com/124/

He notes that sending a decent-sized swimming pool's worth of water(135 Horses) is practical with not too many Falcon heavy launches. He does not mention oxygen ISRU though, which would make this even easier to the extent that it'd be possible to deliver the hydrogen with just one mission. I get 12.5 tonnes of Hydrogen for a 10m x 5m x 2m pool which would fit in a BA 330.

Huh. If Bigelow gets his lunar hotel running he'll need to include a swimming pool. It could lead to a significant increase in demand. I think the number of people who would be interested to pay for moon gravity swimming is probably larger than the number of people who'd want to pay to have their footprints on the moon.
« Last Edit: 01/12/2015 11:59 pm by Nilof »
For a variable Isp spacecraft running at constant power and constant acceleration, the mass ratio is linear in delta-v.   Δv = ve0(MR-1). Or equivalently: Δv = vef PMF. Also, this is energy-optimal for a fixed delta-v and mass ratio.

Offline the_other_Doug

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Re: XKCD Webcomic
« Reply #30 on: 01/13/2015 05:01 am »
New XKCD what-if on swimming pools on the moon:

http://what-if.xkcd.com/124/

He notes that sending a decent-sized swimming pool's worth of water(135 Horses) is practical with not too many Falcon heavy launches. He does not mention oxygen ISRU though, which would make this even easier to the extent that it'd be possible to deliver the hydrogen with just one mission. I get 12.5 tonnes of Hydrogen for a 10m x 5m x 2m pool which would fit in a BA 330.

Huh. If Bigelow gets his lunar hotel running he'll need to include a swimming pool. It could lead to a significant increase in demand. I think the number of people who would be interested to pay for moon gravity swimming is probably larger than the number of people who'd want to pay to have their footprints on the moon.

Forget swimming -- I'd rather fill a dome or sealed lava tube with air, strap on wings, and fly in lunar gravity.  You'd need a pretty high air pressure to make it work, but that would be cheaper than bringing, or making, water just to swim in, I'd think...
-Doug  (With my shield, not yet upon it)

Offline nadreck

Re: XKCD Webcomic
« Reply #31 on: 01/13/2015 06:25 am »
And I always wanted to hollow out an ice asteroid, spin it for artificial gravity and figure skate hard enough and fast enough that I could perturb the effect of the artificial gravity.
It is all well and good to quote those things that made it past your confirmation bias that other people wrote, but this is a discussion board damnit! Let us know what you think! And why!

Offline pagheca

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Re: XKCD Webcomic
« Reply #32 on: 01/13/2015 12:10 pm »
New XKCD what-if on swimming pools on the moon:

http://what-if.xkcd.com/124/

He notes that sending a decent-sized swimming pool's worth of water(135 Horses) is practical with not too many Falcon heavy launches. He does not mention oxygen ISRU though, which would make this even easier to the extent that it'd be possible to deliver the hydrogen with just one mission. I get 12.5 tonnes of Hydrogen for a 10m x 5m x 2m pool which would fit in a BA 330.

Huh. If Bigelow gets his lunar hotel running he'll need to include a swimming pool. It could lead to a significant increase in demand. I think the number of people who would be interested to pay for moon gravity swimming is probably larger than the number of people who'd want to pay to have their footprints on the moon.

Amazing... It would deserve a "Why would you go to the Moon?" thread on its own.

Offline Nilof

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Re: XKCD Webcomic
« Reply #33 on: 01/13/2015 08:19 pm »
New XKCD what-if on swimming pools on the moon:

http://what-if.xkcd.com/124/

He notes that sending a decent-sized swimming pool's worth of water(135 Horses) is practical with not too many Falcon heavy launches. He does not mention oxygen ISRU though, which would make this even easier to the extent that it'd be possible to deliver the hydrogen with just one mission. I get 12.5 tonnes of Hydrogen for a 10m x 5m x 2m pool which would fit in a BA 330.

Huh. If Bigelow gets his lunar hotel running he'll need to include a swimming pool. It could lead to a significant increase in demand. I think the number of people who would be interested to pay for moon gravity swimming is probably larger than the number of people who'd want to pay to have their footprints on the moon.

Forget swimming -- I'd rather fill a dome or sealed lava tube with air, strap on wings, and fly in lunar gravity.  You'd need a pretty high air pressure to make it work, but that would be cheaper than bringing, or making, water just to swim in, I'd think...

Domes/huge pressurized enclosures are a bit more far term. But indeed, they offer some really interesting possibillities.

The increased payload of multicopters is one interesting consequence. could easily lift a person on the Moon (and could almost do the same on Mars). So would we see people using multicopters as the lunar equivalent of scooters? Maybe.
For a variable Isp spacecraft running at constant power and constant acceleration, the mass ratio is linear in delta-v.   Δv = ve0(MR-1). Or equivalently: Δv = vef PMF. Also, this is energy-optimal for a fixed delta-v and mass ratio.

Offline Nilof

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Re: XKCD Webcomic
« Reply #34 on: 01/22/2015 11:09 pm »
New comic:
« Last Edit: 01/22/2015 11:10 pm by Nilof »
For a variable Isp spacecraft running at constant power and constant acceleration, the mass ratio is linear in delta-v.   Δv = ve0(MR-1). Or equivalently: Δv = vef PMF. Also, this is energy-optimal for a fixed delta-v and mass ratio.

Offline Ben the Space Brit

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Re: XKCD Webcomic
« Reply #35 on: 01/27/2015 11:59 am »
That new comic makes me think of the wham revelation in The Hitchhikers' Guide to the Galaxy that Earth was an engineered object. After all, if you're going to build the perfect planet for your experiment, why not also build the entire perfect solar system? Magrathea is doing a special on extreme-eccentricity KBOs this week!
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Offline Hotblack Desiato

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Re: XKCD Webcomic
« Reply #36 on: 01/28/2015 10:05 pm »
That new comic makes me think of the wham revelation in The Hitchhikers' Guide to the Galaxy that Earth was an engineered object. After all, if you're going to build the perfect planet for your experiment, why not also build the entire perfect solar system? Magrathea is doing a special on extreme-eccentricity KBOs this week!

sounds like a good place for a concert. ;-)

(but I'm unavailable due to being dead in the restaurant at end of the universe, due to tax reasons).
« Last Edit: 01/28/2015 10:17 pm by Hotblack Desiato »

Offline kch

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Re: XKCD Webcomic
« Reply #37 on: 01/28/2015 10:23 pm »
That new comic makes me think of the wham revelation in The Hitchhikers' Guide to the Galaxy that Earth was an engineered object. After all, if you're going to build the perfect planet for your experiment, why not also build the entire perfect solar system? Magrathea is doing a special on extreme-eccentricity KBOs this week!

sounds like a good place for a concert. ;-)

(but I'm unavailable due to being dead in the restaurant at end of the universe, due to tax reasons).

No worries -- Vader's guarding you well:

http://en.wikipedia.org/wiki/Dave_Prowse#Other_roles

;)

Offline wxmeddler

Re: XKCD Webcomic
« Reply #38 on: 02/09/2015 04:35 am »

Offline sghill

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Re: XKCD Webcomic
« Reply #39 on: 02/13/2015 01:23 pm »
For anyone watching the EM Drive thread in the Advanced Concepts general area, today's XKCD is an absolute scream!!!  http://www.xkcd.com/1486/

I wonder if he's a lurker on NSF...
Bring the thunder!

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