DB's absolutely amazing sci/tech thread

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Andrew
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Re: DB's absolutely amazing sci/tech thread

Post by Andrew » 02 Nov 2018, 18:04

A llama once bit my sister...
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Re: DB's absolutely amazing sci/tech thread

Post by Aresen » 03 Nov 2018, 10:48

Andrew wrote:
02 Nov 2018, 18:04
A llama once bit my sister...
A one-'l' lama or a two-'l' llama?
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Re: DB's absolutely amazing sci/tech thread

Post by lunchstealer » 03 Nov 2018, 21:10

moose bites can be veri nasti
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Re: DB's absolutely amazing sci/tech thread

Post by Kolohe » 07 Dec 2018, 22:23

This is literally your jam, right Docktor T?

https://what-if.xkcd.com/145/
when you wake up as the queen of the n=1 kingdom and mount your steed non sequiturius, do you look out upon all you survey and think “damn, it feels good to be a green idea sleeping furiously?" - dhex

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Re: DB's absolutely amazing sci/tech thread

Post by thoreau » 07 Dec 2018, 23:04

I'm not convinced that they're right about the reflected light. They're right about a lot of stuff in there, but if I reflect direct sunlight off of a mirror before focusing it with a magnifying glass I should still be able to start a fire. So I'm not convinced that they're right about the moonlight argument. The reflected sunlight is not in thermal equilibrium with the moon.

The part about etendue is right though.

I need to think about this.
"They were basically like D&D min maxers, but instead of pissing off their DM, they destroyed the global economy. Also, instead of their DM making a level 7 paladin fight a beholder as punishment, he got a +3 sword of turning."
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Eric the .5b
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Re: DB's absolutely amazing sci/tech thread

Post by Eric the .5b » 07 Dec 2018, 23:47

Even if you couldn't do so with the moon, could you start a fire with enough starlight, then?

Personally, while the explanation made sense, I thought one of the whole points of using telescopes was that they made target objects, like low-magnitude stars, brighter.
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Re: DB's absolutely amazing sci/tech thread

Post by thoreau » 08 Dec 2018, 01:12

Eric the .5b wrote:Even if you couldn't do so with the moon, could you start a fire with enough starlight, then?

Personally, while the explanation made sense, I thought one of the whole points of using telescopes was that they made target objects, like low-magnitude stars, brighter.
In principle, sure. But I can't even begin to imagine the size of the telescope needed and I'm too lazy to look up numbers.

I actually did the calculation just now for the moon. They are right about the etendue argument but kind of wrong about the thermodynamic argument. There is a very subtle link between the thermodynamic argument and the etendue argument but I have never seen a good explanation of the link, and I am not convinced that anyone has adequately explored it. I am sort of convinced that if I could sort that out I could understand a few other results that are known in small specialist communities but have never been carefully explained in terms accessible to other physicists.
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Eric the .5b
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Re: DB's absolutely amazing sci/tech thread

Post by Eric the .5b » 08 Dec 2018, 02:37

thoreau wrote:
08 Dec 2018, 01:12
Eric the .5b wrote:Even if you couldn't do so with the moon, could you start a fire with enough starlight, then?

Personally, while the explanation made sense, I thought one of the whole points of using telescopes was that they made target objects, like low-magnitude stars, brighter.
In principle, sure. But I can't even begin to imagine the size of the telescope needed and I'm too lazy to look up numbers.
I remember someone (Robert L. Forward?) writing an article on settling the Oort Cloud, and one of the power systems he suggested was solar sail-like starlight collection devices the size of North America...
"Better that ten guilty persons escape than that one innocent suffer."
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Re: DB's absolutely amazing sci/tech thread

Post by Warren » 08 Dec 2018, 10:54

thoreau wrote:
08 Dec 2018, 01:12
Eric the .5b wrote:Even if you couldn't do so with the moon, could you start a fire with enough starlight, then?

Personally, while the explanation made sense, I thought one of the whole points of using telescopes was that they made target objects, like low-magnitude stars, brighter.
In principle, sure. But I can't even begin to imagine the size of the telescope needed and I'm too lazy to look up numbers.

I actually did the calculation just now for the moon. They are right about the etendue argument but kind of wrong about the thermodynamic argument. There is a very subtle link between the thermodynamic argument and the etendue argument but I have never seen a good explanation of the link, and I am not convinced that anyone has adequately explored it. I am sort of convinced that if I could sort that out I could understand a few other results that are known in small specialist communities but have never been carefully explained in terms accessible to other physicists.
Hey, Newton had the apple, Feynman got his big idea from some frat bro throwing a plate, you should look into this. If you figure it out, maybe you'll understand something only you understand. Then you tell us about it. Seriously, tell us about it before you publish.
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Re: DB's absolutely amazing sci/tech thread

Post by Aresen » 20 Dec 2018, 11:35

I completely missed this announcement a few weeks back, but LIGO has confirmed four more black hole mergers
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Re: DB's absolutely amazing sci/tech thread

Post by thoreau » 20 Dec 2018, 11:47

Aresen wrote:I completely missed this announcement a few weeks back, but LIGO has confirmed four more black hole mergers
Ocasio-Cortez is asking NASA and the Antitrust Division of the Department of Justice to block further mergers.
"They were basically like D&D min maxers, but instead of pissing off their DM, they destroyed the global economy. Also, instead of their DM making a level 7 paladin fight a beholder as punishment, he got a +3 sword of turning."
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Aresen
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Re: DB's absolutely amazing sci/tech thread

Post by Aresen » 20 Dec 2018, 12:18

thoreau wrote:
20 Dec 2018, 11:47
Aresen wrote:I completely missed this announcement a few weeks back, but LIGO has confirmed four more black hole mergers
Ocasio-Cortez is asking NASA and the Antitrust Division of the Department of Justice to block further mergers.
I approve of Ocasio-Cortez getting between any two black holes attempting to merge.
If Trump supporters wanted a tough guy, why did they elect such a whiny bitch? - Mo

Those who know history are doomed to deja vu. - the innominate one

Never bring a knife to a joke fight" - dhex

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thoreau
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Re: DB's absolutely amazing sci/tech thread

Post by thoreau » 03 Jan 2019, 02:53

China just landed a probe on the Dark Side of the Moon.

https://www.nytimes.com/2019/01/02/worl ... -moon.html

Makes sense. They've already done The Wall.
"They were basically like D&D min maxers, but instead of pissing off their DM, they destroyed the global economy. Also, instead of their DM making a level 7 paladin fight a beholder as punishment, he got a +3 sword of turning."
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Re: DB's absolutely amazing sci/tech thread

Post by Warren » 03 Jan 2019, 12:41

thoreau wrote:
03 Jan 2019, 02:53
China just landed a probe on the Dark Side of the Moon.

https://www.nytimes.com/2019/01/02/worl ... -moon.html

Makes sense. They've already done The Wall.
Was the first transmission from Chang’e-4 "Wish You Were Here"?
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Re: DB's absolutely amazing sci/tech thread

Post by Highway » 03 Jan 2019, 12:53

I'm kind of hoping it's the start of their nuclear waste dump so that we can have a real life Space:1999.
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Re: DB's absolutely amazing sci/tech thread

Post by Pham Nuwen » 03 Jan 2019, 15:51

Fools! Why are you not asking the real questions? Huh? What are you gryll peeps hiding with your false flag redirects and pop culture references?

ARE THERE TRANSFORMERS UP THERE OR NOT? IS THE HUMAN RACE IN DANGER????? ARE THEY GOING TO TRY TO STEAL OUR SUN???? ANSWER ME DAMMIT!
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Re: DB's absolutely amazing sci/tech thread

Post by Aresen » 03 Jan 2019, 18:10

Highway wrote:
03 Jan 2019, 12:53
I'm kind of hoping it's the start of their nuclear waste dump so that we can have a real life Space:1999.
But who would you place at Moonbase Alpha to be blasted out of the Solar System to eternally wander the galaxy?
If Trump supporters wanted a tough guy, why did they elect such a whiny bitch? - Mo

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Highway
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Re: DB's absolutely amazing sci/tech thread

Post by Highway » 03 Jan 2019, 20:14

Aresen wrote:
03 Jan 2019, 18:10
Highway wrote:
03 Jan 2019, 12:53
I'm kind of hoping it's the start of their nuclear waste dump so that we can have a real life Space:1999.
But who would you place at Moonbase Alpha to be blasted out of the Solar System to eternally wander the galaxy?
I can make a list? It would never end!
"Sharks do not go around challenging people to games of chance like dojo breakers."

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Re: DB's absolutely amazing sci/tech thread

Post by Warren » 03 Jan 2019, 21:46

Highway wrote:
03 Jan 2019, 20:14
Aresen wrote:
03 Jan 2019, 18:10
Highway wrote:
03 Jan 2019, 12:53
I'm kind of hoping it's the start of their nuclear waste dump so that we can have a real life Space:1999.
But who would you place at Moonbase Alpha to be blasted out of the Solar System to eternally wander the galaxy?
I can make a list? It would never end!
We fucked up, so we're going to need more money. - Tuco

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Pham Nuwen
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Re: DB's absolutely amazing sci/tech thread

Post by Pham Nuwen » 03 Jan 2019, 21:47

YOU PEOPLE NEED TO STAY ON TOPIC!!!! ARE THERE TRANSFORMERS OVER THERE OR NOT???
Goddamn libertarian message board. Hugh Akston

leave me to my mescaline smoothie in peace, please. dhex

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Kolohe
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Re: DB's absolutely amazing sci/tech thread

Post by Kolohe » 03 Jan 2019, 21:50

Pham Nuwen wrote:
03 Jan 2019, 21:47
YOU PEOPLE NEED TO STAY ON TOPIC!!!! ARE THERE TRANSFORMERS OVER THERE OR NOT???
Image
when you wake up as the queen of the n=1 kingdom and mount your steed non sequiturius, do you look out upon all you survey and think “damn, it feels good to be a green idea sleeping furiously?" - dhex

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Andrew
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Re: DB's absolutely amazing sci/tech thread

Post by Andrew » 03 Jan 2019, 22:18

Moon Nazis. I hate Moon Nazis.
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Re: DB's absolutely amazing sci/tech thread

Post by Warren » 03 Jan 2019, 22:18

Pham Nuwen wrote:
03 Jan 2019, 21:47
YOU PEOPLE NEED TO STAY ON TOPIC!!!! ARE THERE TRANSFORMERS OVER THERE OR NOT???
What are you, seven?
They're going to dig up the Tycho Magnetic Anomalie.
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Pham Nuwen
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Re: DB's absolutely amazing sci/tech thread

Post by Pham Nuwen » 03 Jan 2019, 22:26

Warren wrote:
03 Jan 2019, 22:18
Pham Nuwen wrote:
03 Jan 2019, 21:47
YOU PEOPLE NEED TO STAY ON TOPIC!!!! ARE THERE TRANSFORMERS OVER THERE OR NOT???
What are you, seven?
They're going to dig up the Tycho Magnetic Anomalie.
I know you are but what am I. Also. Not going to google your old, dated reference. More importantly, why were those people smoking in a fucking space station? Can't explain that.
Goddamn libertarian message board. Hugh Akston

leave me to my mescaline smoothie in peace, please. dhex

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Pham Nuwen
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Re: DB's absolutely amazing sci/tech thread

Post by Pham Nuwen » 03 Jan 2019, 22:27

Andrew wrote:
03 Jan 2019, 22:18
Moon Nazis. I hate Moon Nazis.
Do ... do they look similar to the one pictured?
Goddamn libertarian message board. Hugh Akston

leave me to my mescaline smoothie in peace, please. dhex

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