@nyrath@spacey.space
@nyrath@spacey.space avatar

nyrath

@nyrath@spacey.space

Star map and Atomic Rocket geek. The hard-science SF writer's tech support. The website is at
http://www.projectrho.com/public_html/rocket/

Refugee from the decline and fall of Google Plus.

In my long and misspent youth I did the artwork for various TTWG such as Ogre, WarpWar, GEV and such.

This profile is from a federated server and may be incomplete. Browse more on the original instance.

isaackuo, to space
@isaackuo@spacey.space avatar

How to launch from Titan with 3.9km/s TSTO:

(Geoffrey Landis and others)

https://ntrs.nasa.gov/api/citations/20210025383/downloads/Titan%20Sample%20Return_AIAA-SciTech_Finals%20(002).pdf

You first go slow - less than 100m/s (360kph, or 220mph) for the first stage, up to around 30-40km. This gets you above the thickest atmosphere. Then the second stage can take over with an engine more optimized for vacuum.

more commentary here: https://diaspora.glasswings.com/posts/a93f4630ffec013c9573448a5b29e257

#SpaceTechnology #SpaceExploration #Space #Titan #PostcardsFromCutty

nyrath,
@nyrath@spacey.space avatar

@isaackuo

Another example of LEO being "halfway to anywhere"

nyrath, to random
@nyrath@spacey.space avatar

US Army Airland Battle 2000 (1982 Version with Functional Areas) pdf file

https://apps.dtic.mil/sti/citations/ADA127471

image/jpeg
image/jpeg
image/jpeg

nyrath,
@nyrath@spacey.space avatar

@tkinias

I haven't read the paper yet. But I agree that is weird terminology

razumasu, to scifi
@razumasu@me.dm avatar

What’s your favorite book that features time travel? Let’s talk about bending time in literature!

nyrath,
@nyrath@spacey.space avatar

@razumasu

All of an Instant by Richard Garfinkle.

It takes place in the Block Universe model of time, eternalism version.

https://www.sfsite.com/10b/all67.htm

https://www.kirkusreviews.com/book-reviews/richard-garfinkle/all-of-an-instant/

cstross, to random
@cstross@wandering.shop avatar

I wonder what Dilbert Stark will make of this.

(Is it really wise of Trump to openly declare war on the owner of Twitter at this point?)
https://mstdn.social/@hkrn/112519375589535987

nyrath,
@nyrath@spacey.space avatar

@cstross

Maybe it is just me, but I have noticed what seems to be a tendency for people of that political persuasion to totally focus on short-term gain or satisfaction, and totally ignore any and all long-term consequences.

nyrath, to random
@nyrath@spacey.space avatar

Perhaps Space Mastodon can help me.

The image below is from Artificial Satellites of the Earth (1958)

I have a memory of seeing that image back in the 1960s, but I'm pretty sure I saw it in color. But the various image search engines are coming up empty.

Does any one else know where I can find the color version?

https://dreamsofspace.blogspot.com/2018/11/artificial-satellites-1958.html

nyrath,
@nyrath@spacey.space avatar

@60sRefugee

Thanks, but that is a group page that includes the exact same link from my question post.

Thanks anyway.

nyrath, to random
@nyrath@spacey.space avatar

https://youtu.be/5xG09d3WcGo?si=Kuzvsxx8z28UJGZc

johncarlosbaez, (edited ) to random
@johncarlosbaez@mathstodon.xyz avatar

Using his periodic table, Mendeleev predicted the properties of many elements that hadn't been discovered yet. But he missed others - and more than half of his predicted elements were never found!

Two of the most interesting are coronium and newtonium. He predicted both to have atomic masses lighter than hydrogen!

Mysterious green spectal lines had been seen in the Sun's corona in 1869. Mendeleev was not the only one who thought it was a new element: coronium. He estimated its atomic mass as 0.4. It later turned out to be a highly ionized form of iron, Fe¹³⁺, meaning that 13 electrons get knocked off by the extremely high temperatures.

Even more interesting is newtonium. Back then, a lot of people thought light consisted of vibrations in a mysterious substance called the aether. In 1904, in a 50-page paper called “An attempt towards the chemical conception of the aether”, Mendeleev hypothesized that the aether was a noble gas! A bunch of new noble gases had just been discovered, forcing a new column in his table. He dubbed this one newtonium, and he estimated its atomic mass as 0.17.

For Mendeleev's other never-found elements, and how he estimated the masses of coronium and newtonium, read this:

• Gábor Lente, Where Mendeleev was wrong: predicted elements that have never been found, https://link.springer.com/article/10.1007/s40828-019-0092-5

Moral: you don't have to be right all the time.

nyrath,
@nyrath@spacey.space avatar

@johncarlosbaez

I use Mendeleev's periodic table as a paradigm for science fiction authors brainstorming their scifi rubber-science. I call it the "interesting holes" technique.

https://www.projectrho.com/public_html/rocket/prelimnotes.php#interestingholes

nyrath,
@nyrath@spacey.space avatar

@johncarlosbaez

I noticed a reference to "coronium" in Fletcher Pratt's scifi novel Alien Planet (1960).
The alien ship uses it as rocket fuel. It has to travel to Mercury in order to harvest chromium from the solar photosphere.

nyrath, to random
@nyrath@spacey.space avatar

Project Hephaistos – II
Dyson sphere candidates from Gaia DR3, 2MASS, and WISE

https://academic.oup.com/mnras/article/531/1/695/7665761?login=false

nyrath, to random
@nyrath@spacey.space avatar

I must have weird taste in scifi movies.
I just watched Atlas and thought it was pretty good.

But I thought Rebel Moon stank on ice.

Go figure.

nyrath,
@nyrath@spacey.space avatar

@mds2

The danger of an artificial intelligence going all SkyNet on the human race.

nyrath,
@nyrath@spacey.space avatar

@tkinias

Titan has apparently gotten very bad reviews. I did read a couple of reviews singing the praises of Rebel Moon.

nyrath, to random
@nyrath@spacey.space avatar

Russian research on space nukes and alternative counterspace weapons (part 2)

https://www.thespacereview.com/article/4797/1

TheSpaceshipper, to random
@TheSpaceshipper@socel.net avatar

Rocketship X-M was released 74 years ago today.

"An astronaut crew on their way to the Moon are unexpectedly propelled by gravitational forces and end up on Mars instead."

nyrath,
@nyrath@spacey.space avatar

@TheSpaceshipper

nyrath, (edited )
@nyrath@spacey.space avatar

@oliver_schafeld

1949

https://books.google.com/books?id=hUoEAAAAMBAJ&pg=PA67#v=onepage&q&f=false

gsuberland, to random
@gsuberland@chaos.social avatar

SD cards are the literal worst.

they've expanded to be the size of small hard drives, and devices like the rpi keep using them as boot media, but they:

  • use garbage tier low endurance flash cells internally
  • have little to no overprovisioning for wear
  • perform only the most basic wear levelling
  • have no protocol level integrity checking
  • have few internal error correction features, if any
  • decay comparatively quickly without patrol scrubs
  • do not perform patrol scrubs
  • cannot do PLP
nyrath,
@nyrath@spacey.space avatar

@gsuberland

So you are telling me I have set myself up to fail by sticking a one terabytes SD card into my tablet?

I guess I'll have to teach myself how to set up an NAS or something.

nyrath, to random
@nyrath@spacey.space avatar

Caplan Stellar Engine

Paper here: https://sites.google.com/view/m-caplan-stellar-engines/startseite

YouTube video here: https://youtube.com/watch?v=v3y8AIEX_dU

nyrath, to random
@nyrath@spacey.space avatar
nyrath, (edited )
@nyrath@spacey.space avatar

@izaya

I've seen the bug-eye design used in the "Dan Dare - pilot of the future" comic books

nyrath,
@nyrath@spacey.space avatar

@Steveg58

I'll try to transcribe it for you when I can get to my desktop with a real keyboard. There is no way I can type all that with a tablet's glass keyboard.

nyrath,
@nyrath@spacey.space avatar

@tkinias @cjshearwood

You got me. I have no idea

nyrath, to random
@nyrath@spacey.space avatar

Non-nuclear strategies for deflecting comets and asteroids (pdf file)

https://www.researchgate.net/publication/234347108_Non-nuclear_strategies_for_deflecting_comets_and_asteroids

nyrath,
@nyrath@spacey.space avatar

@olav

Ummm, I'm not sure which you mean

nyrath, to random
@nyrath@spacey.space avatar

APR: 3D Printed Aerospace/Nuclear subjects

https://www.aerospaceprojectsreview.com/blog/?p=5399

nyrath,
@nyrath@spacey.space avatar

@60sRefugee @Madagascar_Sky @jstevenyork

There was a study done in 1968.

Nowadays? Not a chance.

It is all fun and games, until the quartz chamber cracks at ten kilometers altitude.

Then you have a fissioning reactor that is already vaporized, spreading to the four winds over the entire damn planet.

https://ntrs.nasa.gov/citations/19680012569

  • All
  • Subscribed
  • Moderated
  • Favorites
  • •
  • JUstTest
  • rosin
  • mdbf
  • khanakhh
  • ethstaker
  • osvaldo12
  • DreamBathrooms
  • thenastyranch
  • magazineikmin
  • InstantRegret
  • Youngstown
  • everett
  • slotface
  • kavyap
  • anitta
  • cubers
  • Durango
  • modclub
  • tacticalgear
  • ngwrru68w68
  • tester
  • GTA5RPClips
  • provamag3
  • cisconetworking
  • normalnudes
  • Leos
  • megavids
  • lostlight
  • All magazines
    •