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420chan is Getting Overhauled - Changelog/Bug Report/Request Thread (Updated April 10)
Astronomical Illusion - Earth is the center of the universe Ignore Report View Thread Reply
William Huggins - Tue, 19 Jun 2018 17:15:11 EST ID:6aIwEr35 No.57311
File: 1529442911009.jpg -(342372B / 334.35KB, 1920x1080) Thumbnail displayed, click image for full size. 342372
Hello!

This is from a video series I saw long ago and it described a general illusion that is responsible for the Earth being seen as the center of the universe.

Like they say that in a few million/billion years the sky is going to be completely dark because the stars are moving away from us. But this is just an illusion from our vantage point. We're also moving away from them but we can't see it, only visualize it.


The way I remembered in the video was very clever and simple.

It was like rows and columns of 4 dots:

. . . .
. . . .
. . . .
. . . .
Comment too long. Click here to view the full text.
1 posts omitted. Click View Thread to read.
>>
Thomas Henderson - Wed, 20 Jun 2018 10:08:09 EST ID:6aIwEr35 No.57313 Ignore Report Reply
>>57312

Thanks for the explanation but the illusion I was referring to was the fact that astronomers before would always postulate that Earth was the center of everything (that is, stationary) and everything else is moving away or moving around us.

But in reality, Earth is moving as well and isn't actually stationary.

The illusion is that Earth is just used as a stationary anchor point for our perspective because we need a relatively stable point to base our calculations on. Like the same way we arbitrarily chose the weigh of a kilogram and now use that to conceptualize weight relative to one another.

But because of modern technology, we can visualize the universe more conceptually without putting Earth at the center.
>>
Henry Draper - Wed, 20 Jun 2018 22:42:36 EST ID:457vC2+I No.57314 Ignore Report Reply
1529548956888.jpg -(111795B / 109.17KB, 1280x720) Thumbnail displayed, click image for full size.
>>57313
Astronomers certainly are aware of the motion of our solar system and account for it in their calculations when it is relevant, including calculations of expansion and redshift. I agree I wish popularly available star charts included depictions of the direction of motion and speed of stars so people can visualize what is going on better, but if, as a matter of principle, we stop using earth as the reference point, over time they will become off center with the physical hubble volume, the universe-lifetime light sphere of earth, which is obviously centered here. Once we are an interplanetary species, we will obviously need new definitions, and for most practical purposes the difference won't matter much.

How would you feel about using the center of the galaxy (either its gravitational center or the supermassive blackhole Sag A*) as our reference center point? That wouldn't differ too much from our visible observations, and seems the most convenient.
>>
Annie Cannon - Wed, 27 Jun 2018 15:30:26 EST ID:6aIwEr35 No.57319 Ignore Report Reply
>>57314

I'm not against using Earth or whatever as a reference.

I was just intrigued by the natural phenomena that we see ourselves as the center of things when it's a fallacy of perception. And I remember the same phenomena existed in astronomy until the copernican revolution


Hey Locked Ignore Report View Thread Reply
Charles Bolton - Fri, 25 May 2018 04:39:48 EST ID:eiFhhu/4 No.57283
File: 1527237588460.jpg -(368926B / 360.28KB, 720x1280) Thumbnail displayed, click image for full size. 368926
Check this mother ****** out.
Locked
Thread has been locked
Thread was locked by: jericho
Reason: OK, but this really isn't astronomy related, it's just your drawing?
>>
Kiyotsugu Hirayama - Sat, 26 May 2018 13:15:33 EST ID:10X7g+Qi No.57284 Ignore Report Reply
1527354933221.jpg -(2595730B / 2.48MB, 2448x3264) Thumbnail displayed, click image for full size.
Whoay thread. I'm going to be working all day and maybe into the night. Hope i produce something increadible!


Stephen Hawking died at age 76 Ignore Report View Thread Reply
Johan Galle - Wed, 14 Mar 2018 03:52:46 EST ID:UgaLEhyB No.57237
File: 1521013966541.jpg -(203302B / 198.54KB, 1160x629) Thumbnail displayed, click image for full size. 203302
Goodnight you genius retard
>>
William Hartmann - Wed, 14 Mar 2018 09:04:12 EST ID:eygzYfFg No.57238 Ignore Report Reply
His absurd in-mental astrophysics simulations will be missed. Rest in peace dude, you deserve it.
>>
Thomas Henderson - Wed, 14 Mar 2018 11:22:05 EST ID:sL8p9E02 No.57239 Ignore Report Reply
RIP to the coolest dude.
>>
William Fowler - Fri, 13 Apr 2018 19:43:23 EST ID:Iarb3bdT No.57277 Ignore Report Reply
You were a remote-controlled animatronic silicone muppet for decades, but a pretty good mascot and an excellent rapper.


Fucking ECLIPSE thread! Ignore Report View Thread Reply
Irwin Shapiro - Sun, 20 Aug 2017 15:50:15 EST ID:KgS57XEk No.57006
File: 1503258615031.jpg -(263261B / 257.09KB, 1932x1932) Thumbnail displayed, click image for full size. 263261
ECLIPSE THREAD MOFOS!

Come on! Get excited for this!

I got a cheap solar filter sheet and put it in front of my 300mm lens. Which is plugged into a 2x teleconverter. 600mm to grab the eclipse.

Took some test shots today and got to see some sunspots! Which are freaking cool (well, RELATIVELY cool...LOL!)

Post eclipse shit here people!
6 posts and 1 images omitted. Click View Thread to read.
>>
Annie Cannon - Mon, 25 Dec 2017 10:09:30 EST ID:2C/bTB2T No.57134 Ignore Report Reply
>>57011
Also viewed in Casper, WY
>>
Cecelia Payne-Gaposchkin - Mon, 09 Apr 2018 20:06:44 EST ID:87P+p9li No.57275 Ignore Report Reply
>>57006

I saw it.
>>
Mike Brown - Tue, 10 Apr 2018 23:41:41 EST ID:Wv34DROU No.57276 Ignore Report Reply
i seent it


Intergalactic Electromagnetism Ignore Report View Thread Reply
Bruon Rossi - Sun, 18 Feb 2018 06:53:57 EST ID:tC4KRASE No.57199
File: 1518954837151.gif -(2096340B / 2.00MB, 400x354) Thumbnail displayed, click image for full size. 2096340
Hey /sagan/,

Quick question for y'all. Currently we observe the universe to be expanding at an accelerating rate and no equations can account for the force behind this since all scientists tend to be looking at gravity alone. However, the electromagnetic force is something like 30 orders of magnitude stronger than gravity, and has the same inverse relationship to the square of the distance between the objects, meaning even at vast cosmic distances it should still be relevant, in fact MORE relevant, than gravity.

Maybe instead of "dark energy" it is simply the electromagnetic repulsion between galaxies who all gained like charges through the big bang or whatever and they simply move apart like two protons would?

Has this theory been debunked or seriously investigated?
12 posts and 2 images omitted. Click View Thread to read.
>>
Karl Jansky - Thu, 01 Mar 2018 22:21:30 EST ID:PAGBpgJc No.57220 Ignore Report Reply
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>>57199
Inflation theory doesn't say that stuff in the universe is moving away from each other, rather that the space-time where the stuff resides is expanding, giving the red shifted appearance of most celestial objects. I'm not sure where you got the gravity thing from, as it's not really coming into play.
>>
Thomas Henderson - Fri, 16 Mar 2018 01:30:53 EST ID:eygzYfFg No.57240 Ignore Report Reply
Place your bets dudes and dudettes.

Dark energy is:
1) something we haven't discovered yet
2) an error in our understanding of physics
3) cthulhu ftaghn ia ia ia ia tekeli
>>
Rudolph Minkowski - Sun, 25 Mar 2018 11:41:19 EST ID:oI9ZFXsB No.57273 Ignore Report Reply
>>57240
Those aren't mutually exclusive.


Red Dwarf ayy lmaos Ignore Report View Thread Reply
William Hartmann - Mon, 15 Jan 2018 13:34:12 EST ID:y3vStdZD No.57154
File: 1516041252879.jpg -(66050B / 64.50KB, 1024x768) Thumbnail displayed, click image for full size. 66050
In this thread ITT we discuss the habitability of red dwarf systems
Scientists have theorized that these planets could be habitable despite being tidally locked with their stars. They believe there would be enough convection between the light and dark sides to maintain oceans, an atmosphere etc.
I think it would be interesting how life would evolve on such a world, particularly intelligent life. Imagine how the material conditions of the world would affect culture, technological development, geopolitics etc.
https://en.wikipedia.org/wiki/Habitability_of_red_dwarf_systems
Discuss
10 posts omitted. Click View Thread to read.
>>
Charles Bolton - Tue, 13 Feb 2018 12:18:11 EST ID:4uIlxD// No.57190 Ignore Report Reply
>>57154

I feel like if life developed on any planet it would spread and adapt to all envitonments.

Imagine a planet with three wildly divergent patterns, in the hot, twilight, and dark sides.

Any intelligent ayyylmaos would want to access resources from the other zones, the technology and methods developed to survive and colonize the opposite side of their planet would translate well to space travel. The history of the conquest of their own planet would be fascinating.

What would it do to a society to have half the planet living in hostile conditions?

What if two separate races descended from entirely different trunks of an evolutionary tree that branched in the microbial era became sapient separately, isolated from each other by their wildly different environments?
>>
Charles Bolton - Tue, 13 Feb 2018 12:30:08 EST ID:4uIlxD// No.57191 Ignore Report Reply
>>57167
Jupiter has a magnetic field from its metallic hydrogen core. Gas giant's have moons big enough to hold an atmosphere, and the tidal forces from orbiting close to a gas giant have been observed to create geologic and weather activity.

Could Jupiter sized gas giant's exist close enough to a gas dwarf to be warm enough to evolve life? Would the magnetic field of such a hypothetical gas giant protect its moons?

Earth life hates radiation because it denatures proteins, a fundamental structure in all earth life, Earth life even uses proteins to store the information that makes evolution possible.

Are there any classes of molecules capable of the kind of structural and interactive diversity of proteins that aren't as vulnerable to radiation?
>>
Viktor Ambartsumian - Thu, 15 Feb 2018 03:10:20 EST ID:m3P6k9jA No.57193 Ignore Report Reply
1518682220337.gif -(45588B / 44.52KB, 640x452) Thumbnail displayed, click image for full size.
>>57191
>Earth life hates radiation because it denatures proteins, a fundamental structure in all earth life
In the beginning, it hated oxygen because it oxidized proteins. It's not inconceivable that carbon-based life in in an environment with ionizing radiation could adapt to mitigate the damage and use the energy.
https://en.wikipedia.org/wiki/Radiotrophic_fungus

>Are there any classes of molecules capable of the kind of structural and interactive diversity of proteins that aren't as vulnerable to radiation?
All molecules are, under a few feet of water.


Private Space Industry can now reach Mars. Ignore Report View Thread Reply
Henrietta Levitt - Tue, 06 Feb 2018 17:11:41 EST ID:unNII3om No.57169
File: 1517955101747.jpg -(14848B / 14.50KB, 153x258) Thumbnail displayed, click image for full size. 14848
The Falcon Heavy launch was a success. There's a Tesla car now in transfer orbit to Mars, and this is a fact. Beyond how absurd that sounds, this actually means that a private actor now has the capability to put orbiters and more around Mars. Which means a huge step closer to putting people on the world.

Space-X has provien that they at least has the capability to reach the un-told numbers of asteroids passing through that range.
Is this Musk's actual end-game here? To capture some metal-heavy asteroid and bring it into low-Earth orbit for mining? I dunno, but still, the future is getting tangible as fuck.
8 posts and 2 images omitted. Click View Thread to read.
>>
Harlow Shapley - Thu, 08 Feb 2018 17:18:49 EST ID:p73EfNkl No.57179 Ignore Report Reply
>>57177

the point of heavy is the recovery of the boosters (although the 3rd one did crash so more work needs to be done)
>>
Hannes Alven - Thu, 08 Feb 2018 19:31:02 EST ID:NyLhIW/E No.57181 Ignore Report Reply
>>57177
But that's not the point of the Falcon Heavy, it was to become the largest lift capacity commercial rocket presently operated...which it now is. You'll have to wait until later this year for them to surpass the Saturn V with the Big Fucking Rocket, which absolutely could redo Apollo. (Also, imagine how much lighter we could make a modern Apollo mission with current materials and tech.)
>>
William Herschel - Fri, 09 Feb 2018 23:52:48 EST ID:coC9H9eG No.57183 Ignore Report Reply
1518238368620.gif -(1620911B / 1.55MB, 654x360) Thumbnail displayed, click image for full size.
Starman is definitely a construction android.

That bell under the car sure had a lot of room for secret gear.

Mars is a hologram: we already live on Mars. Earth is long dead.


Juno Close-Up of Jupiter Ignore Report View Thread Reply
Bernard-Ferdinand Lyot - Sat, 16 Dec 2017 14:49:08 EST ID:unNII3om No.57129
File: 1513453748388.jpg -(117513B / 114.76KB, 1041x586) Thumbnail displayed, click image for full size. 117513
https://www.nasa.gov/mission_pages/juno/images/index.html

These pictures alone are worth the 1 billion dollars of the mission.
>>
Edwin Hubble - Sat, 20 Jan 2018 00:13:35 EST ID:GzPfXXE4 No.57159 Ignore Report Reply
1516425215727.jpg -(165760B / 161.88KB, 1041x884) Thumbnail displayed, click image for full size.
>>57129
Totally worth it. Fuckin love jupiter
>>
Galileo Galilei - Sat, 20 Jan 2018 07:34:49 EST ID:8caD3Z7Z No.57161 Ignore Report Reply
1516451689471.jpg -(1387428B / 1.32MB, 1041x1239) Thumbnail displayed, click image for full size.
>>57159
Nasa bitches be trippin


Revolutionary new theory disproving gravity and our understanding of the cosmos Ignore Report View Thread Reply
William Lassell - Sun, 26 Nov 2017 13:07:45 EST ID:Wzm4xeu3 No.57104
File: 1511719665892.jpg -(70190B / 68.54KB, 1000x707) Thumbnail displayed, click image for full size. 70190
https://www.youtube.com/watch?v=xDSS5k-105M

What if the heavens we have gazed in wonder for so long are not so vast...but in fact smaller than the landmass we inhabit?

Unlike the ridiculous flat earth theory, which makes no sense, this new theory makes a lot of sense, and not only that, it manages to combine science with religion in a rational, logical way.
8 posts and 2 images omitted. Click View Thread to read.
>>
Cecelia Payne-Gaposchkin - Wed, 06 Dec 2017 16:12:29 EST ID:unNII3om No.57122 Ignore Report Reply
>>57121

Easy. Who would seriously put shit in a bag besides dog-owners?

Check mate nb
>>
Wilhelm Beer - Mon, 01 Jan 2018 12:27:22 EST ID:eygzYfFg No.57141 Ignore Report Reply
Is this the "Elon Musk is Satan" guy that spammed /high/ full of his schizophrenic retard shit a few months ago?
>>
Nicolaus Copernicus - Mon, 05 Mar 2018 12:39:55 EST ID:ej0yxAjW No.57230 Ignore Report Reply
I can here to check this out from a complaint thread on /420/ to see if it was true.. Gave me a good chuckle. Thanks 420chan.


Astronomy Club Ignore Report View Thread Reply
Ejnar Hertzprung - Wed, 13 Sep 2017 12:02:26 EST ID:dWt9NTso No.57017
File: 1505318546672.gif -(181264B / 177.02KB, 197x270) Thumbnail displayed, click image for full size. 181264
I'm trying to make an astronomy club but I don't know what it would be about or what to do. Everyone else who likes astronomy are just shy like me and we all refuse to talk. Logically I know that the club show be at night because astronomy but what do you think I should do at such a club. Thank you
2 posts omitted. Click View Thread to read.
>>
Karl Swarzchild - Thu, 21 Sep 2017 10:46:21 EST ID:sywMqW4i No.57025 Ignore Report Reply
>>57017
>the club should be at night
>what do you think I should do at such a club

well gee, ill tell you what i think
>>
Galileo Galilei - Sat, 23 Sep 2017 21:07:05 EST ID:7bk1TGPO No.57028 Ignore Report Reply
maybe you could look at stars and talk about them
>>
Tycho Brahe - Fri, 22 Dec 2017 01:13:32 EST ID:mZKzn5Lt No.57133 Ignore Report Reply
>>57017
in my highschool astronomy club we participated a lot in SETI


https://www.celestron.com/products/powerseeker-127eq-telescope Ignore Report View Thread Reply
Joseph von Fraunhofer - Sun, 03 Dec 2017 04:35:05 EST ID:UEOi/cKA No.57111
File: 1512293705978.png -(193419B / 188.89KB, 1920x1080) Thumbnail displayed, click image for full size. 193419
Im looking for a telescope in the 150-180 range for my cousin
can someone knowledgable help me
https://www.celestron.com/products/powerseeker-127eq-telescope

some of these have more "zoom" I am retarded but are some are cheaper and some have less and are more expensive so I don't get it?
>>
Jericho !.iRAtomic2 - Fri, 15 Dec 2017 12:14:31 EST ID:Wnqom/n1 No.57128 Report Reply
Go for something with a larger aperture size. This collects more light, allowing lenses with more zoom to be used without everything fading out.
I'd recommend something with a 4"+ aperture. It will come with at least a 40mm eyepiece, and if your cousin wants, they can get other lenses that will zoom more.


You don't understand galactic scales; Relativity is a bitch thread Ignore Report View Thread Reply
Kiyotsugu Hirayama - Thu, 04 May 2017 18:10:19 EST ID:unNII3om No.56931
File: 1493935819961.png -(221879B / 216.68KB, 521x311) Thumbnail displayed, click image for full size. 221879
So imagine you have two cannons firing their cannon balls away from each other, and their muzzle velocity is the speed of light.

You'd think the relative speed of one cannon ball to the other would be 2x the speed of light, right?

Nope. The equation for relative speed between two objects looks like this:

>v1+2=v1+v2/(1+v1v2/c^2)

Where v1 and v2 are the speeds of the two cannon balls and c is the speed of light.

So as the velocity of the cannon balls approaches the speed of light, their own speed doesn't matter and the limit of light speed is dominant. Relative speed of 2x speed of light is thus impossible.

Or in other words: wat.


You guys got some other relativistic mind-blowers?
22 posts and 3 images omitted. Click View Thread to read.
>>
Jocelyn Bell - Thu, 02 Nov 2017 07:39:24 EST ID:eygzYfFg No.57072 Ignore Report Reply
>>56933
Wromholes don't mess with time because you bend space. Time still flows through the wormhole.
>>
George Hale - Sat, 04 Nov 2017 17:29:49 EST ID:unNII3om No.57075 Ignore Report Reply
>>57072

Um no? It's known as the one most likely way of traveling through time dude. Remember time and space are two sides of the some coin. You bend one you bend the other.
>>
Charles Bolton - Sun, 03 Dec 2017 16:31:39 EST ID:+kYrHA6N No.57114 Ignore Report Reply
>>57072

then how did Tasha Yar have a daughter?


Ayy-lmao! A steroid! Ignore Report View Thread Reply
Christiaan Huygens - Fri, 27 Oct 2017 23:01:24 EST ID:RH1VsRBv No.57067
File: 1509159684326.jpg -(13365B / 13.05KB, 400x227) Thumbnail displayed, click image for full size. 13365
https://www.cnet.com/news/interstellar-asteroid-comet-a-2017-u1-pan-starrs-nasa-earth/

>All the asteroids and comets astronomers have ever spotted in our celestial neighborhood appear to come from somewhere else in the solar system and orbit the sun, just like Earth.

That is, until the University of Hawaii's Pan-STARRS 1 telescope last week discovered what appears to be the first ever seen "interstellar object" -- an asteroid (or maybe a comet) that escaped from the gravitational grasp of another star and fell through the roof of our solar system.

That makes the object currently designated A/2017 U1 an alien of sorts around our corner of the cosmos.

The foreign space-something is less than a quarter-mile (400 meters) across, but is moving super fast at 15.8 miles (25.5 kilometers) per second. That's over three times faster than Asteroid 2012 TC4, the rock that gave Earth a close shave earlier this month.

"This is the most extreme orbit I have ever seen," said Davide Farnocchia, at NASA's Center for Near-Earth Object Studies (CNEOS). "It is going extremely fast and on such a trajectory that we can say with confidence that this object is on its way out of the solar system and not coming back."
>>
Maximilian Wolf - Sun, 29 Oct 2017 03:25:09 EST ID:iHcy51j9 No.57068 Ignore Report Reply
A little eerie.
>>
Nicolaus Copernicus - Fri, 10 Nov 2017 02:51:08 EST ID:XdfxkLaX No.57085 Ignore Report Reply
Imagine the shit that goes faster than that tho.


Hey Nerds Ignore Report View Thread Reply
Antony Hewish - Sun, 23 Jul 2017 18:26:46 EST ID:Fbpr3rrr No.56982
File: 1500848806452.png -(45948B / 44.87KB, 600x224) Thumbnail displayed, click image for full size. 45948
I was wondering why you guys post here? Aren't these boards ungodly slow? Wouldn't it be easier for you to just go to an actual forum for space discussion? Why wait so long for a reply from some drug addict about stars or whatever when you can probably get better information more quickly from somewhere else?

Not judging, just genuinely curious
13 posts and 2 images omitted. Click View Thread to read.
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Kip Thorne - Thu, 12 Oct 2017 14:09:23 EST ID:KX/DxO6v No.57048 Ignore Report Reply
>>56999

speed exists in relation to predetermined points on a coordinate system
>>
James Elliott - Thu, 12 Oct 2017 16:50:14 EST ID:unNII3om No.57050 Ignore Report Reply
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>>57048

Space has no inherent coordinate system dude. This is like one of THE realizations of relativism.
>>
Kip Thorne - Thu, 12 Oct 2017 19:57:11 EST ID:KX/DxO6v No.57052 Ignore Report Reply
>>57050

yep, very good. now let's break down relativism: that which is relative [to a given frame of reference]; i.e. you make up your own system as an observer, which will be different from every other observer's system. an object in motion in relation to another object in motion can only have a determinate speed (if we are serious about this conversation we should start using the term velocity, actually) within a predetermined system.


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