/sci/ - Science & Math

>>14885533
Hrmm...they can use a optical device to focus enough light on a point on a rock to make lava...

Sun powered Jetsons cars when?

>>14885538
I don't know about the sun-driven Jetson car. This is for light sail driven spacecraft leaving the solar system for interstellar space

>>14885547
>This is for light sail driven spacecraft leaving the solar system for interstellar space

Uh, yeah...Jestons car.

But seriosuly, if youre leaving the sun behind you have to acvount for some inverse square law of some nerd stuff, idk...Im just a Jetsons fan.

lets keep the grandiose science fiction fantasies where they belong so this board can be reserved for actual science discussion, if you have a grandiose science fiction fantasy you want to discuss, use the fiction section. science is nonfiction.
>>>/lit/21049217

>>14885561
>science is nonfiction

A Star Trek trocorder was science fiction. Now most people in the world carry one around in their pocket.

Science fiction is the precursor to science fact, for if you cannot dream it...how could you hope to build it?

>>14885561
>"Hurr DERP!!! No actual scientists seriously discussed interstellar travel!!!!!! Lol!!!!!!

Would you like to ban discussions on submarines because some French guy wrote a sci-fi book about one in the 1800s too. We should also ban any discussions on space travel of any sort since that's just sci-fi shit too.

>>14885589
Not to mention the serious proposals for traveling between star systems are interpolations of current technology.

>>14885606
>traveling between star systems are interpolations of current technology.

This. I think it would be more fruitful to try and figure out a way to communicate interstellarly in real than than to try and create stasis pods for millenia so people can land on a quasi-inhabitable planet with no supporting life sources.

>>14885614
*in real time

Like some "subspace signalling", idk...Star Trek has a term for it and if its found we'll use it.

>>14885614
We can communicate across interstellar distances...but it takes time and power to send a radio or laser signal across light-years that isn't drown out by background noise and you have to be willing to wait about a decade at the absolute minimum for a reply. What you are referring to go beyond interpolating current technology or even understanding of physics. Right now, from what we know, information can only travel at the speed of light. You would first have to prove Einstein's theory of relativity wrong or find an exploitable loophole. Stuff like wormholes or tachyons are highly theoretical and would have to be proven to exist first. If someone can produce either even on the scale of a laboratory, then it could be considered. Until then, it can't be considered an interpolation of current technology.

>>14885589
https://archive.macleans.ca/article/2005/5/30/the-star-trek-connection
>THE STAR TREK CONNECTION
>A surprising number of child sex abusers appear to be Trekkies. Trying to figure out what that means, however, shows how little we really know about pedophiles

>>14885685
>"HERR DERP!!!! Pointing out yesterday's sci-fi concept is today's commonplace technology makes you a pedophile!!!"

You're an idiot.

>>14885703
portable handheld radio communication devices predate your soience fiction comic book charades by several decades, the fact that you're unaware of that reveals where you got your popsoi education from.

>>14885533
Solar panel is 400w/meter2... 10 wing is 4 joules/sec , so velocity at an hour is 30 m/s ... given its 10 kilos

but thats a solar panel, a mirror is 5x reflectivity

>>14885744
>"HURR DERP!!! STAR TREK ONLY SCIENCE FICTION IP IN ALL OF EXISTENCE!!!! HURR DERP!!!!"

Your stupidity knows no limit just you know nothing.

>>14886474
>>>/lit/21049217

your solar sail is ideally large but thin thus lightweight (low mass) what is it going to be made out of OP that won't melt away under this concentrated beam of raw sunlight?

>>14887212
What isn't reflected will be radiated as heat on both sides of the thin structure.

https://onlinelibrary.wiley.com/doi/10.1002/adom.202102835

https://aip.scitation.org/doi/10.1063/1.4947274

A reflective coefficient of 99.5 to 99.8% for optical surfaces is not out of the question.

If light sail material can safely operate at a radiating temperature of 400 K with heat radiating on both sides, then the sail will radiate 2900 watts per square meter on both sides. If the sails reflects 99.8% of the light shining on it, then it will reflect 500× that number or 1.45 megawatt per square meter of sail.

This will generate (1,450,000 watts/m^2) × (1+0.998)/(299792458 m/s) = 0.0097 Newtons per square meter of sail. For one square kilometers of sails, that would be almost 10,000 Newtons of thrust. That would be a 1-g acceleration if the payload and sails weighed 1 metric ton.