Leave these fields empty (spam trap):
You can leave this blank to post anonymously, or you can create a Tripcode by using the format Name#Password
[i]Italic Text[/i]
[b]Bold Text[/b]
[spoiler]Spoiler Text[/spoiler]
>Highlight/Quote Text
[pre]Preformatted & Monospace Text[/pre]
[super]Superset Text[/super]
[sub]Subset Text[/sub]
1. Numbered lists become ordered lists
* Bulleted lists become unordered lists


420chan is Getting Overhauled - Changelog/Bug Report/Request Thread (Updated July 26)

WTF is up with barred spirals?

View Thread Reply
- Sat, 23 Mar 2019 22:16:58 EST aGo2dCNY No.57596
File: 1553393818527.jpg -(6845831B / 6.53MB, 6637x3787) Thumbnail displayed, click image for full size. WTF is up with barred spirals?
Why did all of the material in those two spiral arms lose all of their angular momentum and head for the core at the same time? I bet those two hard right turns those arms tax are separated by 15-20kpc. Since so many galaxies do this, whatever is happening to this one must be pretty common.
Also check out all those galaxies buried in the background, there must be some kinda awesome galaxy cluster back there.
12 posts and 3 images omitted. Click View Thread to read.
A_Wizard !cMZsY.BCnU!!vVWR8L52 - Sun, 16 Jun 2019 15:28:59 EST 9YXtXzja No.57746 Reply
>because I don't know, nobody does!
You've clearly fallen for the same logical fallacy of the agnostics.
Urbain Le Verrier - Thu, 22 Aug 2019 01:30:27 EST aGo2dCNY No.57780 Reply
>logical fallacy of the agnostics.
the gnostics were religious leaders who said to their people "we understand how god works, but you're too dumb to understand so just do as we say and we ain't explaining shit."
the agnostics were people who didn't believe what the gnostics were telling them
there was no falacy
Johan Galle - Sun, 25 Aug 2019 01:48:54 EST 06SA2lBv No.57785 Reply
>420chan argues about religion featuring such classics as, "there was no falacy"


View Thread Reply
- Sat, 20 Jul 2019 13:56:32 EST aTAck/kf No.57760
File: 1563645392145.jpg -(284082B / 277.42KB, 1440x1068) Thumbnail displayed, click image for full size. THE MOON IS OURS BITCH!
Daniel Kirkwood - Thu, 22 Aug 2019 06:31:28 EST PkLJZC5m No.57782 Reply
Isn't the flag completely white by now due to radiations?
Walter Baade - Thu, 22 Aug 2019 23:42:06 EST oTc+I6iI No.57783 Reply
I heard of a fake one, but whatever, taking men to the moon is already ludicrous idea in this day and age. Also they have an idea going around of a moon base and the Earth going into Nuclear war and wait it out.

zOMG it spins!

View Thread Reply
- Thu, 21 Mar 2019 02:08:39 EST aGo2dCNY No.57582
File: 1553148519011.png -(16747B / 16.35KB, 710x420) Thumbnail displayed, click image for full size. zOMG it spins!
lets say you were somewhat nearby a rapidly rotating neutron star such that the star's diameter was a significant portion of the distance from the star. Would the star's effective center of gravity be offset towards the approaching limb because of the relative velocities and redshifts of the approaching side versus the retreating one?
If its real, how significant would the effect be? Does the effect imply that the gravity well isn't symmetrical?
10 posts and 3 images omitted. Click View Thread to read.
William Hartmann - Tue, 14 May 2019 17:38:07 EST 457vC2+I No.57702 Reply
Mhm. That's why I said
>>We model gravity based around a sphere with a radius...
>> ...but this is a simplification
Urbain Le Verrier - Thu, 22 Aug 2019 01:39:29 EST aGo2dCNY No.57781 Reply
With respect to the receding limb, as the mass is accelerated away from the observer at relativistic speeds, the mass exerts less gravitational influence because of the redshift. The receding limb appears to effectively lose mass as well as getting dimmer and cooler. Could that effective loss of gravitational pull due to the acceleration be considered "anti-gravity" and if so, what potential uses could be made of a propellant based propulsion system in which the propellant reaches relativistic speeds?

Fermi Paradox... why?

View Thread Reply
- Thu, 22 May 2014 00:54:34 EST ILYTISHs No.53812
File: 1400734474447.png -(111524B / 108.91KB, 400x325) Thumbnail displayed, click image for full size. Fermi Paradox... why?
Another thread made me start thinking about this. The Fermi Paradox states (thanks, Wikipedia):

>The Sun is a young star. There are billions of stars in the galaxy that are billions of years older;
>Some of these stars probably have Earth-like planets which, if the Earth is typical, may develop intelligent life;
>Presumably, some of these civilizations will develop interstellar travel, a technology Earth is investigating even now, such as that used in the proposed 100 Year Starship;
>At any practical pace of interstellar travel, the galaxy can be completely colonized in a few tens of millions of years.

If that's the case, why haven't we been colonized already, or at least seen evidence of intelligent life somewhere in our galaxy?

My take: either A) Life takes a long time to develop, and somehow, improbably, we're the first planet to develop an intelligent civilization in our galaxy, or at least one of the first. We don't see anyone else because there isn't anyone else to see... yet, or we're all still too far apart.

Or b) Given the size and composition constraints of a planet able to foster and sustain life (as far as we know, "habitable zone," big enough to have an atmosphere, small enough to still be rocky, etc.) and continue long enough for said life to begin to explore the galaxy, the home planet simply runs out of resources before meaningful headway can be made. I think this is more of a slow-death kind of thing where maybe we get to do some exploration within the solar system and maybe a bit beyond for a while, but overpopulation, war, disease, famine, and whatever else causes us to realign our priorities from space exploration to merely sustaining life on our own planet. A civilization that had the foresight to know something like that was happening could theoretically, if they had the goal of galactic expansion from the start, avoid this situation, but the problem is that NO civilization has that kind of 10,000 year plan from the get-go, and they all sputter out right before they could have pulled it off. There's not a textbook on "how to succeed as a species" that gets handed out to a life form when it develops self-awareness, so following the natural progression, they all fail. the ability to extract resources necessary for galactic colonization from anywhere off-planet becomes viable too late in the game to save the species.

tl;dr - We're all gonna die, prolly. Thoughts?
338 posts and 80 images omitted. Click View Thread to read.
Jocelyn Bell - Fri, 09 Aug 2019 18:05:34 EST EZOyjhDZ No.57775 Reply
> One of the questions I have is: Has it truly been inevitable for humanity to go into space?

Of course not.
What, however is inevitable that life from Earth will die out in about a billion years or so. And humanity probably sooner.

Given all the implications of the Fermi Paradox I see it sort of a responsibility for humanity to colonize space. If we don't all the Solar System/Galaxy/Local Group will exist for nothing.
Jan Hendrik Oort - Fri, 16 Aug 2019 22:46:15 EST eygzYfFg No.57778 Reply
Arab civs could have easily gone into space. The regression of Arab science wasn't internally. It was a reaction to Mongol invasions that were so severe, the Arab peoples thought the world was ending.

If those invasions never happened, we'd all be speaking Arab and the Renaissance would never have happened.
Otto Struve - Tue, 20 Aug 2019 18:47:02 EST oTc+I6iI No.57779 Reply
There's a thought that if you are creating signals that are going into the universe, it's wrong. Because one of the founding idea's is that the unbound signals build up and wrap around important globes, making a layer, which causes a contamination for example when a single new single is trying to break on it's own locally.

Cool shit in our Solar System!

View Thread Reply
- Mon, 22 Jul 2019 14:41:25 EST 51a1lc6j No.57761
File: 1563820885533.jpg -(116780B / 114.04KB, 2000x2000) Thumbnail displayed, click image for full size. Cool shit in our Solar System!
First one is Saturn's Hexagon on its north pole.
Essentially formed because of a turbulent storm near the vortex creating two weird waves that makes hexagons naturally.
2 posts and 2 images omitted. Click View Thread to read.
Ejnar Hertzprung - Wed, 24 Jul 2019 22:11:54 EST aO4yM0Az No.57765 Reply
1564020714385.jpg -(264642B / 258.44KB, 1920x1080) Thumbnail displayed, click image for full size.
Jupiter is basically Starry Night on acid.
Friedrich Bessel - Fri, 16 Aug 2019 22:33:48 EST IAtieTJ+ No.57777 Reply
someone put this through the dog machine

you know the one

Perseid meteor shower!

View Thread Reply
- Wed, 31 Jul 2013 11:29:34 EST evrPe8Vs No.51233
File: 1375284574338.jpg -(3913B / 3.82KB, 262x192) Thumbnail displayed, click image for full size. Perseid meteor shower!
Anyone else gonna observe this beautiful event?

Incase you haven't heard from AUG 12th to the 13th between 10:30PM and 4:30 AM, The sky's gonna light up with massive fireballs brighter than Jupiter.
44 posts and 7 images omitted. Click View Thread to read.
Wilhelm Beer - Thu, 15 Nov 2018 04:28:30 EST N7xCPuZj No.57491 Reply
Leonid shower's s'pposed to be coming up this weekend, for those who won't have a big honkin' snowstorm gumming up the skies, at least.
Walter Adams - Sat, 10 Aug 2019 21:09:46 EST 6xb1mqvl No.57776 Reply
1565485786592.jpg -(777603B / 759.38KB, 2560x1707) Thumbnail displayed, click image for full size.
Anyone going to observe this year's Perseid meteor shower?

Wishing for a cloudless sky.


View Thread Reply
- Mon, 25 Mar 2019 00:14:59 EST aGo2dCNY No.57605
File: 1553487299164.jpg -(913441B / 892.03KB, 1027x1027) Thumbnail displayed, click image for full size. NSFW PICS ITT
galaxies fucking
6 posts and 2 images omitted. Click View Thread to read.
Irwin Shapiro - Tue, 30 Jul 2019 10:08:11 EST PrFCBkKv No.57771 Reply
1564495691672.jpg -(2058B / 2.01KB, 225x225) Thumbnail displayed, click image for full size.
A great suck by this whore of a black hole

50th anniversary of this mad cunt's dream coming true

View Thread Reply
- Sat, 20 Jul 2019 11:16:36 EST /X2JLtlU No.57758
File: 1563635796555.jpg -(4889460B / 4.66MB, 2415x3000) Thumbnail displayed, click image for full size. 50th anniversary of this mad cunt's dream coming true

Building Blocks of Life Found on Mars

View Thread Reply
- Thu, 07 Jun 2018 19:12:35 EST eygzYfFg No.57290
File: 1528413155979.jpg -(198462B / 193.81KB, 945x945) Thumbnail displayed, click image for full size. Building Blocks of Life Found on Mars

>Two landmark discoveries reveal organic carbon on the red planet, shaping the future hunt for life on Mars.

I'm scared guys. This could mean life is common in the universe, which means the Great Filter is ahead of us instead of behind us.


Then again, maybe this can show us the Great Filter is already behind us but when it comes to cosmic horror, I'm a half-empty kinda guy.
43 posts and 6 images omitted. Click View Thread to read.
Vera Rubiin - Fri, 07 Jun 2019 15:04:05 EST izGRJ+VN No.57738 Reply
Even in the case there will be evidence in the geological records.
A layer unusually high concentration of iron compounds and scattered refined metals everywhere. Evidence of mining on the layers below.
I can't come up with a complete list but I've seen somebody do it, perhaps I'll find that again.
In the case of "turn the entire crust into a molten fireball" of course life itself would vanish and the atmosphere would be heated so much that it would be blown away into space.
This would paradoxically make it easier to preserve evidence of our civilization since stuff can't oxidize.

This doesn't mean a large enough chuck couln't do it though. With enough kinetic energy the upper crust could evaporate too and be blown away into space.
It would have to be an extra-solar object though since we are pretty much certain nothing of that magnitude is around as far as we can see.
A_Wizard !cMZsY.BCnU!!vVWR8L52 - Sun, 16 Jun 2019 15:24:42 EST 9YXtXzja No.57744 Reply
We've pretty thoroughly contaminated it already though. Considering that even the exterior of the space stations have microbial life on them, and how impossible it is to irradicate every spore and microbe, the red planet is likely already colonised with lichens, puffballs, and extremophile bacteria. It's going to be a long hard journey to determine if the life we find on mars had existed before our modern arrival, unless we manage to find more complex life forms than bacteria and fungi.
Fred Whipple - Tue, 02 Jul 2019 20:39:38 EST eygzYfFg No.57754 Reply
Throw that meteor hard enough, and there won't be any fossils left. Everything will turn into molten rock.

Evidence of Life on Mars?

View Thread Reply
- Mon, 25 Mar 2019 07:04:17 EST sojeXM9D No.57606
File: 1553511857280.jpg -(163544B / 159.71KB, 800x600) Thumbnail displayed, click image for full size. Evidence of Life on Mars?
39 posts and 10 images omitted. Click View Thread to read.
Bernhard Schmidt - Tue, 18 Jun 2019 10:45:41 EST HUBAqrsF No.57749 Reply

you are stupid. your post about the pyramids being electric power plants was full of evolution denial. i thought you were banned anyway
Harlow Shapley - Fri, 21 Jun 2019 10:21:51 EST 7rYnqTgm No.57750 Reply
Are you the original A wizard?
Because you're still dumb as fuck
Fred Whipple - Tue, 02 Jul 2019 20:37:44 EST eygzYfFg No.57753 Reply
Wow, a fucking racist neonazi the future immigrant is also an evolution denialist. Who would have thought... It's almost like retardation comes in pairs.

1999 kw4 nudes

View Thread Reply
- Sun, 26 May 2019 09:40:23 EST vMi3XH8F No.57730
File: 1558878023890.gif -(26482B / 25.86KB, 405x366) Thumbnail displayed, click image for full size. 1999 kw4 nudes
You guys got any close up pics of 1999 kw4? It just sailed by last night over the US. Or was this whole thing just a meme to fuel Doomsday threads on every Chan?

dark matter & string theory

View Thread Reply
- Sun, 24 Mar 2019 17:45:09 EST DGSw25sg No.57599
File: 1553463909536.png -(1111416B / 1.06MB, 891x882) Thumbnail displayed, click image for full size. dark matter & string theory
lets talk about it.
29 posts and 7 images omitted. Click View Thread to read.
Edward Barnard - Thu, 13 Jun 2019 21:38:46 EST f/Tl+D5o No.57742 Reply
After meeting our god I asked about women and he sent me traveling outside to where their creational black crystal resides. I got to know them, then after some time, both collectives let me as a male, and a female from their's, to travel to the central black hole where people reside to learn and get to know everyone. The behavior from the opposite female was so vibrant I couldn't let her near me until her mind was less flippant, so I created a string between us she had to travel up before meeting me. It almost choked her assertive behavior until she understood where I was and we met up the right way.
Johannes Kepler - Sun, 16 Jun 2019 13:11:48 EST NrYIi9kp No.57743 Reply
I did this once but I got a urinary tract infection

Report Post
Please be descriptive with report notes,
this helps staff resolve issues quicker.