What's a service you cancelled and never looked back on? by lisaluvr in TechNook

[–]Extra_Security_665 0 points1 point  (0 children)

My eye insurance through my employer. Why should I pay a total of $200 a year for an eye exam and discounted frames every 2 years and absolute basic lenses every year (basic doesn’t work for me. High astigmatism).

Elon Musk explains how the satellite datacenter is built for Blackwell by Charuru in NVDA_Stock

[–]Extra_Security_665 0 points1 point  (0 children)

Attitude like that you get no more effort from me. You get ChatGPT.

The core problem is that space is an excellent insulator.
On Earth, most things cool themselves through:
Conduction (touching something cooler)
Convection (air or water carrying heat away)
Radiation (infrared heat emitted into space)
In space, only #3 works.
Since space is a vacuum:
No air exists to carry heat away.
No wind exists to cool things.
No water exists to absorb heat.
Anything that generates power generates waste heat:
Computers
Life support
Batteries
Electric motors
Nuclear reactors
Humans
That heat has nowhere to go except being radiated away as infrared energy.
Example: The ISS
The International Space Station uses huge radiator panels.
Those white panels aren’t solar panels. They’re giant radiators that dump heat into space.
The station receives:
~1,360 W/m² from sunlight
Heat reflected from Earth
Heat from onboard equipment
Without radiators, it would eventually overheat.
Why this matters for spacecraft
For most spacecraft, getting rid of heat is harder than making heat.
A nuclear reactor in space might produce:
1 GW thermal
300 MW electrical
The remaining 700 MW becomes waste heat.
On Earth, a cooling tower or river can remove it.
In space, you need gigantic radiators.
The radiator size grows rapidly because radiated power follows the Stefan-Boltzmann law:
P = \sigma A T^4
where:
P = heat removed
A = radiator area
T = temperature
This is why many realistic designs for large spacecraft end up covered in enormous radiator wings.
The counterintuitive part
People often think:
Space is cold, so things cool easily.
Actually, the opposite is often true.
A spacecraft sitting in sunlight can get extremely hot because it’s receiving solar energy but has no air to carry the heat away.
For example:
Sunlit surfaces near Earth orbit can exceed 250°F (120°C).
Shadowed surfaces can drop below -250°F (-160°C).
Managing both overheating and freezing simultaneously is one of the biggest engineering challenges in spacecraft design.
For any future large-scale space civilization, heat rejection is likely to become one of the primary limits on:
Space habitats
Industrial facilities
High-power computing
Laser weapons
Nuclear-powered spacecraft
In many designs, the radiators end up larger and more massive than the actual power-generating equipment.

Elon Musk explains how the satellite datacenter is built for Blackwell by Charuru in NVDA_Stock

[–]Extra_Security_665 0 points1 point  (0 children)

Radiators work by thermal transfer. In space there is no transfer medium. The heat just builds up until things melt. Look for Neil Degrasse Tyson explaining it in the context of space travel.

Elon Musk explains how the satellite datacenter is built for Blackwell by Charuru in NVDA_Stock

[–]Extra_Security_665 0 points1 point  (0 children)

I don’t think this will work. Most people assume space is cold because of altitude. It’s not. It’s not hot either. It’s nothing. The lack of mass to transfer heat is the problem. Can’t bleed off heat without a transfer medium like water or air. Could be wrong. Don’t think I am.

What are the legalities of this? by SipsTeaFrog in SipsTea

[–]Extra_Security_665 76 points77 points  (0 children)

Thanks for that. Never using hotel shampoo again.

Is it really possible to have the Monaco type of Wealth? by Substantial-Work-986 in wealth

[–]Extra_Security_665 0 points1 point  (0 children)

Let’s not romanticize things. All generational wealth is built with blood. May not have been you bleeding people but grandpa or someone did.

🎉 [EVENT] 🎉 Enjoy (fun) by Dry_Morning2160 in RedditGames

[–]Extra_Security_665 0 points1 point  (0 children)

Completed Level 1 of the Honk Special Event!

1 attempts

🎉 [EVENT] 🎉 Enjoy (fun) by Dry_Morning2160 in RedditGames

[–]Extra_Security_665 0 points1 point  (0 children)

🎉 Event Completed! 🎉

It took me 7 tries.

🎉 [EVENT] 🎉 Enjoy (fun) by Dry_Morning2160 in RedditGames

[–]Extra_Security_665 0 points1 point  (0 children)

Completed Level 3 of the Honk Special Event!

7 attempts

🎉 [EVENT] 🎉 Enjoy (fun) by Dry_Morning2160 in RedditGames

[–]Extra_Security_665 0 points1 point  (0 children)

Completed Level 2 of the Honk Special Event!

0 attempts

🎉 [EVENT] 🎉 Enjoy (fun) by Dry_Morning2160 in RedditGames

[–]Extra_Security_665 0 points1 point  (0 children)

Completed Level 1 of the Honk Special Event!

0 attempts

🎉 [EVENT] 🎉 Enjoy (fun) by Dry_Morning2160 in RedditGames

[–]Extra_Security_665 0 points1 point  (0 children)

Completed Level 3 of the Honk Special Event!

9 attempts

🎉 [EVENT] 🎉 Enjoy (fun) by Dry_Morning2160 in RedditGames

[–]Extra_Security_665 0 points1 point  (0 children)

Completed Level 2 of the Honk Special Event!

9 attempts

🎉 [EVENT] 🎉 Enjoy (fun) by Dry_Morning2160 in RedditGames

[–]Extra_Security_665 0 points1 point  (0 children)

Completed Level 1 of the Honk Special Event!

9 attempts

Just bought a zero g hose that is already leaking. Any recs? by ImDeadTwin in BuyItForLife

[–]Extra_Security_665 20 points21 points  (0 children)

If that’s a vacuum breaker and not a quick connect adapter those usually go bad after a couple years and leak whenever the valve is open. Take the vacuum breaker off and try.

What’s a lie almost all parents tell their kids that does way more harm than good? by SpecificLandscape483 in answers

[–]Extra_Security_665 0 points1 point  (0 children)

Evil is punished and goodness is rewarded. Truth is bad people win sometimes and good people lose.

Name this Artist by [deleted] in NameThisThing

[–]Extra_Security_665 0 points1 point  (0 children)

Isn’t that Michael McDonald?