this post was submitted on 08 Aug 2023
123 points (97.7% liked)

xkcd

8961 readers
19 users here now

A community for a webcomic of romance, sarcasm, math, and language.

founded 2 years ago
MODERATORS
top 19 comments
sorted by: hot top controversial new old
[–] [email protected] 19 points 1 year ago (2 children)

OP, you should always include the title alt-text with an xkcd comic. Like so:

Getting the utility people to run transmission lines to Earth is expensive, but it will pay for itself in no time.

[–] tja 1 points 1 year ago

Sorry, my app displays that automatically for xkcd links, so I did not think of that

[–] [email protected] 0 points 1 year ago
[–] [email protected] 14 points 1 year ago

So, a Dyson sphere

[–] [email protected] 11 points 1 year ago (1 children)
[–] [email protected] 20 points 1 year ago* (last edited 1 year ago) (2 children)

the only issue there is is you have to install the panel during night, it is quite hot there during the day.

[–] [email protected] 5 points 1 year ago

You could also wait for an eclipse.

[–] [email protected] 3 points 1 year ago

Who are you, who are so wise in the ways of science.

[–] [email protected] 5 points 1 year ago (1 children)

I guess connecting the panels to the net is an issue for Infra?

[–] [email protected] 8 points 1 year ago* (last edited 1 year ago)

They could send the energy wirelessly in the form of light beams, then use special panels to transform those beams of light on Earth. Let's call them "solar panels".

[–] [email protected] 5 points 1 year ago (2 children)

That number didn't really seem enough to me. However, the solar luminosity is about 3.8×10^26 watts and the surface area about 6.1×10^18 m2, ie. 62.3 MW / m2. 8760 hours in a year times 62300 kW equals 545 million kW/h, at twenty percent efficiency times twenty cents each is $21.8 M/a.

The sun might seem to be really, really hot; but in fact, it is just quite hot and really, really big.

[–] [email protected] 4 points 1 year ago

Xkcd always does the math.

[–] [email protected] 0 points 1 year ago (1 children)

The corona is around 1 million °C. That's really really hot

[–] [email protected] 2 points 1 year ago

The corona is indeed super hot, but also quite tenuous in comparison to the rest of the sun. The photosphere is only about 5500 °C. If our solar panels were made of diamond they would have melted at 3500, but it's not impossible to imagine a solar panel that could be positioned 'quite' close to the sun's surface - would just need to be made from some quite fancy materials.

[–] p1mrx 1 points 1 year ago

Installing a solar panel on the sun is easier said than done. The closest real example is probably the Parker Solar Probe: https://www.youtube.com/watch?v=pOZhPz92Dic

[–] [email protected] 0 points 1 year ago (1 children)

it really sucks having direct links instead of images on mobile

[–] [email protected] 2 points 1 year ago (1 children)

Connect app shows this as an image

[–] [email protected] 2 points 1 year ago

Same on Infinity.

[–] JohnDClay 0 points 1 year ago