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Sorry by John Bahcall - Wed, 05 Mar 2014 07:29:57 EST ID:rE9L0oZt No.53116 Ignore Report Reply Quick Reply
File: 1394022597989.jpg -(8419B / 8.22KB, 220x143) Thumbnail displayed, click image for full size. 8419
Okay, okay, sorry if this has been done before, but

https://en.wikipedia.org/wiki/CMB_cold_spot

WHAT THE FUCK IS THAT?

I mean, it's just so... wrong

It's cosmically wrong

Guys, censor it already it's wrong and should be ashamed of itself
9 posts and 3 images omitted. Click Reply to view.
>>
Stephen Hawking - Mon, 08 Sep 2014 07:40:59 EST ID:dcsAofK8 No.54363 Ignore Report Quick Reply
>>53516
pointing out differences between stuff where people before did not see any, that is true racism. Stop it. People are different, celebrate this.
>>
Grote Reuber - Mon, 08 Sep 2014 10:27:05 EST ID:+fNXPH07 No.54364 Ignore Report Quick Reply
>>54362
No. This plasma idea of the CMB is completely false, shown beautifully by the Sunyaev–Zel'dovich effect which shows galaxy cluster having an intermediate effect in the radiation via an inverse-Compton boosting. This would be explanable if it was just an enhancement of the background but at lower frequencies the effect is a decrease. Wonderfully predicted in the standard model of cosmology decades before CMB a isotropy was even observed, unexplainable by any model which claims the CMB is local.

His proves Alfvens idea of the CMB was wrong but it also had no way to explain the high isotropy, extremely precise planckian form or it's angular power spectrum. It was not "way off what was expected". The CMB matches the standard model well.
>>
Grote Reuber - Mon, 08 Sep 2014 10:27:58 EST ID:+fNXPH07 No.54365 Ignore Report Quick Reply
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>>54364
Forgot pic. A galaxy cluster as seen by Planck though the SZ effect.
>>
Bart Bok - Mon, 15 Sep 2014 17:19:54 EST ID:ADtBYAD1 No.54398 Ignore Report Quick Reply
I have actually done some work on the CMB cold spot and it's alleged association with a supervoid. There is an effect in cosmology called the ISW effect where, in an accelerating universe, photons which move though a large gravitational field are slightly blue shifted even after they left. If they move though a void they will be slightly redshifted. Some have suggested that the cold spot originates from a void where CMB photons would be redshifted after passing though, lowering the observed temperature. People have claimed to have detected this void in surveys.

There are other explanations but this seems to be the most testable.
>>
James van Allen - Fri, 19 Sep 2014 06:43:52 EST ID:t1vMK9Uc No.54416 Ignore Report Quick Reply
I learned more and

the fact that we only recently have pictures of this isn't due to dimness etc it's due to that until like 10 years ago we weren't getting resolution of a temperature down to 1 millionth of a Kelvin

which means that that "cold spot" is a difference of temperature of like less than 1/1000000th of a degree.

I'm not saying it's still not fascinating, but it's become incredibly less fascinating to me.

Also alternative idea time - is it possible than in the dense hot early universe a pair of acoustic waves could cancel each other out and just leave a boring spot in the universe?


Sending a man into a black hole. by Doc Morder - Sat, 09 Aug 2014 05:06:33 EST ID:zB+ZqokG No.54233 Ignore Report Reply Quick Reply
File: 1407575193436.jpg -(1097237B / 1.05MB, 3153x1780) Thumbnail displayed, click image for full size. 1097237
Hey folks, stoner idea...

What would it take to send someone, a volunteer (me), into a black hole?

We could try and make a recording of it.

I wouldn't mind doing it.
9 posts and 1 images omitted. Click Reply to view.
>>
Johann Encke - Tue, 16 Sep 2014 22:49:22 EST ID:kviwdVC/ No.54404 Ignore Report Quick Reply
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>>54402
Not all black holes have observable accretion disks.
Some with accretion disks emit more radiation than some stars.

And jets of ions that are some of the brightest things in the universe.
Pic is a blackhole a billion light years away rotating so the jet points in earth's general direction.
That dim thing in the corner is a galaxy 79 million LY away.
>>
Giuseppe Piazzi - Tue, 16 Sep 2014 23:44:48 EST ID:eMyAc3hv No.54405 Ignore Report Quick Reply
>>54402
no, you would experience spaghettification and would die in incredible pain
>>
Hannes Alven - Wed, 17 Sep 2014 00:29:17 EST ID:SknUZfy5 No.54407 Ignore Report Quick Reply
I remember reading that it's possible to survive a black hole depending on its size, however it's obviously a one-way trip
>>
Joseph von Fraunhofer - Wed, 17 Sep 2014 06:07:50 EST ID:t1vMK9Uc No.54409 Ignore Report Quick Reply
>>54405
You might never even get there if black holes have firewalls https://en.wikipedia.org/wiki/Firewall_%28physics%29

you just horrifically burn up after probably horrifically burning up
>>
Joseph von Fraunhofer - Wed, 17 Sep 2014 06:12:47 EST ID:t1vMK9Uc No.54410 Ignore Report Quick Reply
>>54407
A rapidly spinning black hole creates a strange warp in space time, effectively giving it two event horizons. A particle might survive having it's information... whatever a static black hole does to information... if it hits the right angle and could possibly escape the rapid spinner's inner event horizon only to emerge in something weird and strange because of the distortion of space and time. That's a wormhole, and a white hole at that.

Problem is, that's only a theoretical possibility for a particle, basically impossible for a giant splew of particles like a you.


Time and multiverse question by Jacob Kapteyn - Mon, 15 Sep 2014 11:28:46 EST ID:t1vMK9Uc No.54397 Ignore Report Reply Quick Reply
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Is it coherent to ask if the "multiverse" theories belie a misconception of time, namely, that time doesn't actually have a preferred direction and our "universe" is just an anthropic blindness to the other directions of spacetime?

Like, one supersymmetry theory family posits something that I understood as time symmetry, in that the big bang is just an extreme that spawned a universe with a "forward" arrow and a "backward" arrow, which I took as a universe with extremely low entropy (ours) and one with extremely high (the other, confer negative temperature). In principle, you wouldn't necessarily be able to tell which you're actually part of.

In other words, all "multiverses" are just part of the same monolithic universe, and due to the way physics (or local physics) works we just couldn't evolve in a way to "see" all 4 dimensions (maybe three if the holographic principle I don't know what I'm saying)?

The idea I have is more that a proper graph of time is fuzzier, in that the multiverses aren't really spawned as much as different locations along the time axis (I guess I'm presupposing a philosophical B-theory of time (or the tenseless one, I might be mixing things up)). That kind of fuzzy time is a little more unstable, but I think the anthropic principle would be a decent answer to it. Sorta like Smolin's cosmological selection theory, the regions of the monolithic branching temporal model I'm trying to describe that happen to have the most stable random configurations yield the results we see, we just happen to be in a particularly stable region. Or not. The fact that we're in a c. 14Ga old branch and not a 10^-76s branch or 27Ga or perhaps 27 Googol annum branch is about as arbitrary as asking why we're born in the 80s-90s (probs) and not the 1600s.

Maybe to put it another way, I'm thinking of something like the filament pattern we see in matter through space but a different dimension and describing regional physical stability. That would form a cohesive monolith describable by the right wave functions, instead of a series of universes for all possible outcomes.

Sorry if this isn…
Comment too long. Click here to view the full text.
>>
Kocoayello !jxaL03vL/Q - Tue, 16 Sep 2014 16:27:33 EST ID:Ar8ZIqLY No.54403 Ignore Report Quick Reply
>the regions of the monolithic branching temporal model I'm trying to describe that happen to have the most stable random configurations yield the results we see, we just happen to be in a particularly stable region. Or not. The fact that we're in a c. 14Ga old branch and not a 10^-76s branch or 27Ga or perhaps 27 Googol annum branch is about as arbitrary as asking why we're born in the 80s-90s (probs) and not the 1600s.

Yep. Think of the multiverse as an infinite treelike superorganism, constantly bubble-branching new universes into existence, all cladistical mind you, so universes with similar Fundamental Laws would be on connected branches to ours, and VASTLY different universes would be on the other side of the tree. The ancient Tree Of Life motif from many many cultures, an overmatter type of cosmic symbol, holds true in this interpretation, which begs the question: how much did the ancients know about this kinda stuff, and how and why?
>>
Joseph von Fraunhofer - Wed, 17 Sep 2014 06:05:16 EST ID:t1vMK9Uc No.54408 Ignore Report Quick Reply
>>54403
Well, the logic behind it is actually extremely simple - it's patterning in a way that's one of the simplest fractals there is; all you need is a pattern and a rule that reproduces the structure. Trees happen to be aggregated from smaller structures, and the Y-like pattern is just apt at making something stable that can expose the largest amount of surface area for the smallest amount of investment, and it just happens that there's a simple set of rules to govern it. Humans, descended from apes, making their homes from wood, evolving in tropical tree and fruit rich environments, likely just have this instinctive association of trees with protection, shelter, etc. And when you think of all of existence as being like a big dwelling the part of your brain responsible for analogies goes all "hey tree feeling universe home shelter TREE i know dis" and ends up in a way accidentally correct.

So it's not really coincidence, in that the logic underneath it all is extremely simplistic and recurrent, but it's not that they knew, because it's an analogy that just happened to be a kinda simple overreaching analogy.


To put it another way, we have a civilization that believed the sun created the other planets by coagulating them out of chaos; it's not that they were right - they believed the sun was a flat disk on this side of the sky and they only believed the farmer metaphor in the first place because a rivalry between an agricultural creator god and a solar creator god was resolved by merging the two; it's that they came across an accidentally right metaphor.

Or like a dairy man saying he saw ol betsy by the neighbor's troph and going to get johnboy to help him wrangle her, only it was actually bertha, except when he and johnboy go back to get her betsy's since chased off bertha because bertha is not her friend and she's a thirsty spherical cow, even though bertha is another spherical cow.


fate of universe by Jocelyn Bell - Sun, 14 Sep 2014 23:31:05 EST ID:SknUZfy5 No.54393 Ignore Report Reply Quick Reply
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Is there a theory that says that eventually the universe will expand so large that it will collapse in on itself and create another big bang?

What are your thoughts on the fate of the universe?

"The Last Question" by Isaac Asimov is a short story about the fate of mankind and the universe. Idk if everyone on this has read it or not, but I love it. Here's the link: http://www.multivax.com/last_question.html
>>
Joseph-Louis Lagrange - Sun, 14 Sep 2014 23:47:12 EST ID:/FJQtAXr No.54394 Ignore Report Quick Reply
>>54393

You're thinking of the Big Crunch.
>>
Thomas Gold - Mon, 15 Sep 2014 10:43:08 EST ID:psUbi2cW No.54395 Ignore Report Quick Reply
The Big Crunch doesn't necessarily mean another Big Bang though.
Look for the the Big Bounce, or the Cyclic model, OP.
Easy wiki-links because I'm lazy:
http://en.wikipedia.org/wiki/Big_Bounce
http://en.wikipedia.org/wiki/Cyclic_model


UFOS by Johan Galle - Fri, 12 Sep 2014 22:33:49 EST ID:9ZvewKzu No.54386 Locked Ignore Report Reply Quick Reply
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https://www.youtube.com/watch?v=c7uQf1tL_70
Intredasting
Locked
Thread has been locked
Thread was locked by: synthetic
Reason: /spooky/ or /tinfoil/
>>
Isaac Newton - Sat, 13 Sep 2014 18:20:43 EST ID:/FJQtAXr No.54389 Ignore Report Quick Reply
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>>54386

Very interesting, indeed. This kind of shit is what I'm about.
>>
Vesto Slipher - Sun, 14 Sep 2014 10:18:48 EST ID:6tK+Pyz+ No.54390 Ignore Report Quick Reply
Shouldn't this go on /spooky/


Curiosity arrives at Mt Sharp by Gerard Kuiper - Thu, 11 Sep 2014 20:06:59 EST ID:tyKhVGeE No.54374 Ignore Report Reply Quick Reply
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Curiosity has turned south sooner than was planned and has reached the base of Mt Sharp.
http://www.sciencedaily.com/releases/2014/09/140911183005.htm
>>
Hannes Alven - Thu, 11 Sep 2014 23:00:16 EST ID:OsV3zf7o No.54377 Ignore Report Quick Reply
>>54374
It's kind of depressing when you look at the distance the rover has traveled in km. A team of humans on the surface could have looked at all of that stuff in a matter of hours without a vehicle. When we finally drop a human there, we're going to get a much data in the first day as we did in a couple years of driving rovers around.
>>
Arthur Eddington - Thu, 11 Sep 2014 23:31:06 EST ID:GgeRBdCB No.54378 Ignore Report Quick Reply
>>54377
When do you think this will happen?
>>
William Hartmann - Fri, 12 Sep 2014 20:32:04 EST ID:OXINl/7g No.54383 Ignore Report Quick Reply
>>54378
I'd say within the next 30+ years, if we really get our shit together. I'll consider myself lucky if it happens within my lifetime.
>>
Thomas Gold - Sat, 13 Sep 2014 15:58:45 EST ID:09NA5eRB No.54388 Ignore Report Quick Reply
>>54383
Opportunity's done so well though. Still going after 10 years and 40 km

http://mars.jpl.nasa.gov/mer/mission/status_opportunity.html


The grandfather paradox has been somewhat resolved by Netjester - Wed, 03 Sep 2014 05:28:00 EST ID:HIn9Ejqn No.54351 Ignore Report Reply Quick Reply
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http://www.scientificamerican.com/article/time-travel-simulation-resolves-grandfather-paradox
1 posts omitted. Click Reply to view.
>>
Karl von Weizsacker - Fri, 05 Sep 2014 13:37:56 EST ID:cEGy78pj No.54356 Ignore Report Quick Reply
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>>54352
radio with pictures?
it'll never work!
>>
Sloth - Fri, 05 Sep 2014 18:35:35 EST ID:WG/dK64g No.54357 Ignore Report Quick Reply
>>54352
Time travel IS possible, most likely not being able to go into the past, but going into the future IS in fact possible. Our Cosmos proves this. I didn't read this article at all but spotted your comment. Come on dude!
>>
Cecelia Payne-Gaposchkin - Mon, 08 Sep 2014 03:11:44 EST ID:TRhiJN4K No.54360 Ignore Report Quick Reply
>>54351
>>54357
>>54352

As someone who believes that the concept of time travel must be impossible because of the paradoxes it creates, I have to say that the concept itself comes form our misunderstanding of what time is, and as such relativity as a theory is either missing something big or is fundamentally flawed. Not that I have the answer, but I'll let you know when I do.
>>
Friedrich von Struve - Thu, 11 Sep 2014 16:07:12 EST ID:ksAXy5yQ No.54373 Ignore Report Quick Reply
>>54360
Backwards time travel is impossible because you would have to cause negative time dilation by going faster than the speed of light. Or by somehow having negative mass to start with. (I could link wikipedia on this)

Approaching light speed will move you forwards in time by slowing your relative time, but we already learned that from Cosmos (remember the scooter?).

We already know that traveling forward in time is possible (you're doing it right now), but backwards seems to be impossible until we can work around the light barrier.
>>
Ejnar Hertzprung - Fri, 12 Sep 2014 01:18:19 EST ID:jMZLJuT8 No.54379 Ignore Report Quick Reply
>>54352
don't doubt Netjester man, the machines know


DIY Space Shot by Daniel Kirkwood - Sun, 10 Aug 2014 15:42:21 EST ID:Fs3nWwi0 No.54254 Ignore Report Reply Quick Reply
File: 1407699741856.jpg -(208014B / 203.14KB, 804x534) Thumbnail displayed, click image for full size. 208014
How much do you reckon it'd take to make a homemade rocket capable of launching yourself into orbit?
2 posts omitted. Click Reply to view.
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George Gamow - Thu, 14 Aug 2014 03:25:34 EST ID:4BG8qm42 No.54283 Ignore Report Quick Reply
You would problably be shot down before getting to orbit so...
>>
Kiyotsugu Hirayama - Thu, 14 Aug 2014 10:42:21 EST ID:YOJeQJFe No.54284 Ignore Report Quick Reply
It would be very difficult costing hundreds of thousands at the very least. A good reference is Copenhagen Suborbitals who now have quite a large operation, and that's just a mercury style suborbital launch. It's not something for one person and it would take a lot of experienced engineers.
>>
Alan Guth - Fri, 22 Aug 2014 10:10:41 EST ID:Onsl/yzs No.54326 Ignore Report Quick Reply
>>54254
https://www.youtube.com/watch?v=P5JxXka50Gw

Here ya go!

(Apparently it'll cost you around $50,000, but I don't know if using a helium balloon elevated platform would reduce the cost significantly. I would think it would, because it would bring you to the edge of space, reducing the amount of distance you need to travel, but I dunno)
>>
Joseph Taylor Jr. - Fri, 22 Aug 2014 10:26:27 EST ID:kviwdVC/ No.54329 Ignore Report Quick Reply
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>>54326
You don't get to space by going up, you get there by going really fast.
While you could reduce atmospheric losses this way, there's a reason everyone tries to build launch sites as close to the equator as possible, rather than atop really high mountains.
>>
Arthur Eddington - Tue, 09 Sep 2014 23:05:25 EST ID:OXINl/7g No.54370 Ignore Report Quick Reply
>>54254
If my experience with Kerbal Space Program is any indicator, it will cost one metric fuckload of cash, and you'd probably explode long before orbit. And even if you made it, you'd explode in orbit or run out of fuel before you could ever get home.

/scientific approach


Space is crazy! by Hannes Alven - Sat, 06 Sep 2014 19:45:36 EST ID:xFSNE6M1 No.54358 Ignore Report Reply Quick Reply
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Guys, do you ever like look up at the night's sky, and think to yourself, wow man, that's like so big and we're so small.

It's like, wow, really. I just can't believe it.

I just need a smoke of my weed to even comprehend or appreciate how magical the outer space really is.

Like, what if we aren't alone, what if they're aliens up there, and they're thinking the same thing as us. What if there's some alien up there looking at us. Or rather our star. What a mind trip. Man, I just need an acid bump to really appreciate how beautiful this idea is. I mean, when you're on acid, I really think the aliens are talking directly to you. I mean, in your mind. Has anyone else even experienced this? I might be alone, who knows, but I know I'm not alone in the universe, haha.

Well, hope I connected with someone here, this tokes to you /sagan/ *wink*


No thread about this?! by Wilhelm Beer - Sat, 09 Nov 2013 15:34:11 EST ID:uV+6zbtM No.52205 Banned Ignore Report Reply Quick Reply
File: 1384029251414.jpg -(69871B / 68.23KB, 800x557) Thumbnail displayed, click image for full size. 69871
Today is Carl Sagan's 79th birthday.
If he was still among us, what scientific or technological achievement would he be the most impressed with ? (He died on december 20th 1996)
Banned
User was banned for this post
User was banned by: Jericho
Reason: Remember: No billboards in space.
78 posts and 46 images omitted. Click Reply to view.
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Ejnar Hertzprung - Tue, 27 May 2014 16:24:59 EST ID:Uob8qVnu No.53869 Ignore Report Quick Reply
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>>52205
Bumping While Sagan'd
>>
Carl Seyfert - Wed, 28 May 2014 07:43:50 EST ID:ffJJkPeF No.53874 Ignore Report Quick Reply
At first I was wondering how this thread was still alive, but then I realized I was on /sagan/. I miss you Carl. I never even met you, and then you died, faggot. I'll see you in the afterlife, when we're dancing through the stars
>>
Bernard-Ferdinand Lyot - Sun, 08 Jun 2014 22:29:28 EST ID:JwkK+Ito No.53981 Ignore Report Quick Reply
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BWH watching the season finale of the new COSMOS
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Karl Swarzchild - Sun, 06 Jul 2014 17:09:29 EST ID:R0S4fgzg No.54079 Ignore Report Quick Reply
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BWH i want to keep this thread alive for a whole year

i'll make a new one nov 9
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Edward Barnard - Mon, 01 Sep 2014 22:35:45 EST ID:R0S4fgzg No.54347 Ignore Report Quick Reply
bump


Anomalous Thrust Device and other potential replacements for chemical thrusters by Tycho Brahe - Mon, 04 Aug 2014 03:50:04 EST ID:qrJEl2Cn No.54211 Ignore Report Reply Quick Reply
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http://www.wired.co.uk/news/archive/2014-07/31/nasa-validates-impossible-space-drive

So this seems pretty rad. I'm suprised there wasn't a thread about this all ready. I recall also reading somewhere and seeing in one or two different NOVA episodes other things about promising future propulsion systems that might replace chemical rockets one day soon. What do y'all know? What's the most promising up and coming propulsion technology?

For instance, the image I have provided is apparently one taken by a camera aboard the IKAROS spacecraft, which is one of the first spacecraft powered by a solar sail and sent out by Japan in 2010. That's another technology that I am personally looking forward to. So what is /sagan/ most excited about?
16 posts omitted. Click Reply to view.
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Alan Guth - Fri, 22 Aug 2014 10:14:21 EST ID:Onsl/yzs No.54327 Ignore Report Quick Reply
Hydrogen fuel.
It's the cleanest and most efficient form of combustion fuel out there.
It honestly makes way more sense for a green society than gasoline for cars, though the possible explosion thing is a little off-putting.
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Alan Guth - Fri, 22 Aug 2014 10:23:29 EST ID:Onsl/yzs No.54328 Ignore Report Quick Reply
Also, this technology isn't that new.

http://www.popularmechanics.com/science/space/deep/cosmic-concept-laser-powered-space-travel-16020462
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Carl Seyfert - Sat, 23 Aug 2014 17:28:51 EST ID:ZstOB5GX No.54334 Ignore Report Quick Reply
This technology provides the thrust equivalent of an infant battling a de-clawed kitten.

It's worse than a solar sail. I'll admit it's the cheapest option.
But even the cheapest set of tools won't last more than a day or two in an industrial setting.
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Grote Reuber - Sat, 23 Aug 2014 19:07:52 EST ID:riVRYHVm No.54335 Ignore Report Quick Reply
>>54334

Thrust isn't everything. In deep space, efficiency is quite a bit more important than raw thrust.
>>
Vera Rubiin - Mon, 25 Aug 2014 15:56:21 EST ID:ZstOB5GX No.54341 Ignore Report Quick Reply
>>54335
That's true, But its only real use is a backup to xenon thrusters.
It's like trying to power a hybrid car on AA batteries.

Possibly after a lot of research it could be useful, But right now I doubt any agency would use it for anything more than research purposes


Comet dances with the Snake by Friedrich Bessel - Fri, 22 Aug 2014 17:37:16 EST ID:qjY4VCQP No.54332 Ignore Report Reply Quick Reply
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Comet Jacques is fairly high in the Northern Hemisphere for the next little while, in a relatively easy location to spot. This hardy bugger comes in at about +11 magnitude (although some say it's more like +7), meaning you will probably want a solid telescope to be able to see it but you could maybe use binoculars if you have a big pair. It will look like a fuzzy, blurry ball.

What's convenient is it's placement in the sky (Which I will post in the thread)
Comet Jacques is located in the constellation Cassiopeia, which looks like a W or M triangley shape of fairly bright stars about halfway up in the North East direction. It's a very noticeable constellation and you won't miss it after you've seen it a few times.

Pic is the comet itself
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Friedrich Bessel - Fri, 22 Aug 2014 17:39:17 EST ID:qjY4VCQP No.54333 Ignore Report Quick Reply
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This is where it will be tonight on August 22nd. It will continue shooting upward at an angle every night.


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