DB's absolutely amazing sci/tech thread

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

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

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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

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

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This is literally your jam, right Docktor T?

https://what-if.xkcd.com/145/
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Re: DB's absolutely amazing sci/tech thread

Post by thoreau »

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.
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Eric the .5b
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Re: DB's absolutely amazing sci/tech thread

Post by Eric the .5b »

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

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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

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

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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

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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

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

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

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

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

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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

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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

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

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

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

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YOU PEOPLE NEED TO STAY ON TOPIC!!!! ARE THERE TRANSFORMERS OVER THERE OR NOT???
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Re: DB's absolutely amazing sci/tech thread

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Pham Nuwen wrote: 03 Jan 2019, 21:47 YOU PEOPLE NEED TO STAY ON TOPIC!!!! ARE THERE TRANSFORMERS OVER THERE OR NOT???
Image
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Re: DB's absolutely amazing sci/tech thread

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

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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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Re: DB's absolutely amazing sci/tech thread

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

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Andrew wrote: 03 Jan 2019, 22:18 Moon Nazis. I hate Moon Nazis.
Do ... do they look similar to the one pictured?
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leave me to my mescaline smoothie in peace, please. dhex
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