@hendric@astronomy.city
@hendric@astronomy.city avatar

hendric

@hendric@astronomy.city

Space Enthusiast
Had 15 minutes of fame once (see profile pic)
Occasional Astrophotographer
Staff Radio Firmware Engineer at Silicon Labs
KSU '97
He/him
Score: 10
Still a loser
Austin, TX

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

nyrath, to random
@nyrath@spacey.space avatar

PRELIMINARY DESIGN OF A HYPERVELOCITY NUCLEAR INTERCEPTOR SYSTEM (HNIS) FOR OPTIMAL DISRUPTION OF NEAR-EARTH OBJECTS

nuking incoming rogue asteroids

(pdf file)
https://www.adrc.iastate.edu/files/2012/06/AAS-12-225.pdf

hendric,
@hendric@astronomy.city avatar

@michael_w_busch @nyrath Seems like a nuclear-powered landed ion thruster makes a lot more sense than a big bang that might turn 1 impactor in a few dozen.

malcircuit, to solar
@malcircuit@thingy.social avatar

The sun from a few hours ago. I'm really enjoying this weird semi-inverted technique I've discovered. Really makes the details pop

#solar #astrophotography

hendric,
@hendric@astronomy.city avatar

@thomasfuchs @malcircuit I just got an Astro-Tech 90 CFT and been having a blast with it. So much nicer than my ancient LX200. Hoping to upgrade from a Canon SL1 to an asi2600mc duo soon.

hendric,
@hendric@astronomy.city avatar

@thomasfuchs @malcircuit Wow, nice work! The latest scopes from Lunt Solar Systems are actually dual-use as night-time apos and daytime h-alphas. :D

AkaSci, (edited ) to random
@AkaSci@fosstodon.org avatar

Behold this new hi-res (false-color) image of the "mane" of the Horsehead Nebula taken by JWST's NIRCam Camera.

The Nebula, 1300 light years away, was formed from a collapsing interstellar cloud of material and is illuminated by a nearby star.

The region with the blue clouds contains cold, molecular hydrogen, not yet eroded by UV light from nearby stars. The red photodissociation region contains atomic hydrogen gas and dust, above which lies ionized gas.

https://science.nasa.gov/missions/webb/webb-captures-top-of-iconic-horsehead-nebula-in-unprecedented-detail/
1/n

hendric,
@hendric@astronomy.city avatar

@AkaSci Does JWST download data from all sensors when taking a dedicated run like this?

hendric, to Astronomy
@hendric@astronomy.city avatar

😔 Guess I'll work on astrono-do's this week. kicks rock #AmateurAstronomy #Astronomy

Waititi writing meme adjusted to read panel 1: Sometimes astronomy is opening up your laptop, panel 2: looking at could skies over your house for the next 168 hours, panel 3: and then feeling sad, and then closing it. panel 4: That's still classified as astronomy.

simontatham, to random
@simontatham@hachyderm.io avatar

In bash, writing ${var?} instead of just ${var} or $var means if var isn't defined then bash will throw an error and not execute your command, instead of expanding it to "" and carrying on.

mv file1 file2 $subdir # oops, I overwrote file2
mv file1 file2 ${subdir?} # error message instead of disaster

My favourite use of this is for example commands in documentation, with placeholders for the user to fill in. Then it's OK if a user accidentally copy-pastes it without filling them in!

hendric,
@hendric@astronomy.city avatar

@simontatham I'm just a moron, but why would anyone want the default to be this vs the opposite?? "If you don't recognize this, STOP" seems way more sensible.

mcc, to random
@mcc@mastodon.social avatar

Anyway since waking up I have successfully written a Rust program that parses an mp3 and prints to the terminal the waveform (or rather signal power over time of the whole file) as ASCII art. It works great. There is only one problem: This is not something I need

hendric,
@hendric@astronomy.city avatar

@mcc 🤔 Could you turn a btop load graph into an MP3?

hendric,
@hendric@astronomy.city avatar

@mcc I was thinking more a low thrum that can increase in volume/decrease in volume.

mappingsupport, to random
@mappingsupport@m.ai6yr.org avatar

About those phone apps that display property lines...

Popular apps that display property lines include LandGlide, OnX, Regrid and various others. All they do is display a copy of the parcel line data maintain by the counties. If the county parcel line data is bad then the same bad data is displayed by these apps.

The pic below shows a map I recently made for client using the surveyed description on the client’s deed. The black lines show the parcel line data from the county GIS server.

If this property owner was using a cell phone app instead of a custom map then they would never find their corner stakes.

hendric,
@hendric@astronomy.city avatar

@ai6yr @mappingsupport starts writing up Drone Based Beehive Delivery company for Shark Tank Gonna call it EeHiiV

hendric,
@hendric@astronomy.city avatar

@ai6yr @mappingsupport "So Mr Cuban, we're going to buy up all these defunct Amazon delivery drones for pennies on the dollar, and create beehives that can be dropped off and collected from a drone! We'll paint the drones in cute honey bee livery so people won't be terrified of a box of angry bees dropping in their sunroof."

hendric, to random
@hendric@astronomy.city avatar

Lampasas Loop and Texas Twister!

#Eclipse2024

RickiTarr, to random
@RickiTarr@beige.party avatar

Who is the best Batman villain and why?

hendric,
@hendric@astronomy.city avatar

@Kierkegaanks @RickiTarr OK so hear me out: Batman vs the Penguin except ....

ai6yr, to random
@ai6yr@m.ai6yr.org avatar

Intense rain band heading into Los Angeles. #rain #CAwx #LosAngelea

hendric,
@hendric@astronomy.city avatar

@ai6yr Intense Rain Band is a terrible or great band name. 🤔

hendric, to random
@hendric@astronomy.city avatar

@mastohost Is there any way to get visibility into the Database usage? Age of entries, consumption by remote host name, even a graph of the increase over time would be nice. Thanks!

hendric,
@hendric@astronomy.city avatar

@mastohost Also, what other mitigation options are available than setting an expiration date? Can federation options for voluminous servers slow the growth? Thanks!

hendric,
@hendric@astronomy.city avatar

@mastohost ie, does silencing a server help at all since their general posts wont show up on the federated timeline?

hendric,
@hendric@astronomy.city avatar

@mastohost No. The server is mostly just me, but I am probably following a large variety of accounts across many servers.

hendric, to Babylon5
@hendric@astronomy.city avatar

@Robert_Brandt @isaackuo @Sevoris @cstross @sudnadja @nyrath @KarlSchroeder @FredKiesche Obligatory #Babylon5 : https://www.youtube.com/watch?v=JXDwMRb8DOA JMS had so much right in this long-distance engagement.

FredKiesche, to random
@FredKiesche@dice.camp avatar

And there it is…the first novel-length installment appearance of the BOMB-PUMPED X-RAY LASER!

image/jpeg
image/jpeg
image/png

hendric,
@hendric@astronomy.city avatar

@KarlSchroeder @isaackuo @cstross @sudnadja @nyrath @FredKiesche Rotating warships a la B5 are just a bad idea (no matter how cool they look). Rotating is enormous momentum and makes it hard to do dynamic motions. And damage to the section would rapidly cascade into a disaster. Expanse's "everyone strap in for high G" is the only sensible way to fight.

hendric,
@hendric@astronomy.city avatar

@KarlSchroeder @isaackuo @cstross @sudnadja @nyrath @FredKiesche How so? If my enemy is 5 light-seconds away, there is a huge advantage to being able to move 1 ship-length in 4.9 seconds. 300m ship, that takes about 2.5G.

hendric,
@hendric@astronomy.city avatar

@Sevoris @isaackuo @MeiLin @RogerBW @cstross @sudnadja @nyrath @KarlSchroeder @FredKiesche How much deeper is Venus in the Sun's gravity well? Asteroids would end up much faster than at Earth/Moon.

hendric,
@hendric@astronomy.city avatar

@GoblinQuester @RogerBW @isaackuo @MeiLin @cstross @sudnadja @nyrath @KarlSchroeder @FredKiesche Research I've seen says there is basically no distance safe from high speed lunar dust from a touchdown/lift-off, let alone minor secondaries from a major asteroid impact. The lack of atmosphere means stuff really goes far.

hendric,
@hendric@astronomy.city avatar

@MeiLin @cstross @GoblinQuester @RogerBW @isaackuo @sudnadja @nyrath @KarlSchroeder @FredKiesche I didnt know that, thanks! I'd love to see simulations on the effects though; flaring out the thrust from the nose means more total thrust needed, and with out air to slow it down you'll still hit the soils at an oblique supersonic speed. Maybe the plume expands enough that the density would be low enough to prevent launching boulders, but you're still going to scour fine dust everywhere.

hendric,
@hendric@astronomy.city avatar

@MeiLin @cstross @GoblinQuester @RogerBW @isaackuo @sudnadja @nyrath @KarlSchroeder @FredKiesche I know, use all that delicious cargo space to put a giant low-quality mirror array into space, and use that to melt/sinter landing pads! Plus, you can defocus it to light up polar terrain/power solar powered rovers at the poles.

AnarchoCatgirlism, to Astronomy

Don’t fuck with moon dust. No seriously, do not fuck with moon dust.

Absent any moisture or atmosphere, millennia of asteroid impacts have turned lunar regolith (soil) into a fine powder of razor sharp, glass-like particles. What’s more, the solar wind imparts an electric charge on the dust, causing it to cling to any and every surface it touches through static electricity. On earth, sand tends to get smoother over time as wind and water tumble the grains about, eroding their sharpness. Not so on the moon – lunar dust is sharp and deadly. This is Not A Good Time if you’re an explorer looking to visit our celestial neighbor.

During Apollo, the astronauts faced a plethora of unexpected issues caused by dust. It clung to spacesuits and darkened them enough that exposure to sunlight overheated the life support systems. Dust got in suit joints and on suit visors, damaging them. It ate away layers of boot lining. It covered cameras. Upon returning to the cabin, astronauts attempting to brush it off damaged their suit fabric and sent the dust airborne, where it remained suspended in the air due to low gravity.

Inhaling moon dust causes mucus membranes to swell; every Apollo astronaut who stepped foot on the moon reported symptoms of “Lunar Hay Fever.” Sneezing, congestion, and a “smell of burnt gunpowder” took days to subside. Later Apollo missions even sent a special dust brush with the team to help clean each other and equipment. We don’t know exactly how dangerous the stuff is, but lunar regolith simulants suggest it might destroy lung and brain cells with long-term exposure. 1

In fact the dust is so nasty that it destroyed the vacuum seals of sample return containers. We no longer have any accurate samples of lunar dust, “Every sample brought back from the moon has been contaminated by Earth’s air and humidity […] The chemical and electrostatic properties of the soil no longer match what future astronauts will encounter on the moon.” 2

Whats worse, the solar-charged dust gets thrown up off the moon’s surface via electrostatic forces. The moon doesn’t technically have an atmosphere, but it does have a thin cloud of sharp dust itching to cling to anything it can find.

And it probably isn’t just the moon. “A 2005 NASA study listed 20 risks that required further study before humans should commit to a human Mars expedition, and ranked "dust" as the number one challenge.” 3

The coolest solution I’ve heard about in next-gen spacesuit design is a mesh of woven wires layered into the suit. When activated, the wire mesh would form an anti-static electric field that repels dust. Quite literally a force field. 4

hendric,
@hendric@astronomy.city avatar

@AnarchoCatgirlism Great info! Another fun fact is that large spaceships lifting off may propel moondust to orbit heights, and enough activity could cause scouring across the surface. It would be ironic if the greatest threat isn't micrometeors, but your neighbor constantly landing and taking off. The first missions need to be for setting up a stable dust-free landing pad.

https://www.theverge.com/2019/7/17/18663203/apollo-11-anniversary-moon-dust-landing-high-speed

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