Reply to topic  [ 436 posts ]  Go to page Previous  1 ... 6, 7, 8, 9, 10, 11, 12 ... 18  Next
The Astronomy Thread 
Author Message
User avatar

Joined: Fri Jan 24, 2014 5:22 pm
Posts: 369
Post Re: The Astronomy Thread
Technically, they can use the drill. But it risks sending the probe spinning away, so they want to try that after doing all the other experiments it's fitted with, when the battery has almost run out and there's nothing to lose.

_________________
If every cloud had a silver lining, there would be a lot more plane crashes.


Fri Nov 14, 2014 11:12 pm
Profile
User avatar

Joined: Sat Mar 05, 2011 1:35 pm
Posts: 1292
Location: Middle of Nowhere
Post Re: The Astronomy Thread
hi hi

The Rosetta lander (Philae) ran out of power. Maybe it'll wake back up when it gets closer to the sun, but I have a feeling the solar panels will be too mucked up with vapors by then, even if it gets good exposure. Still, at least they got the majority of what they were after.


Sat Nov 15, 2014 1:27 am
Profile WWW

Joined: Thu Jul 05, 2012 1:55 pm
Posts: 772
Post Re: The Astronomy Thread
I just leave that one here: http://www.engadget.com/2014/12/26/earth-timelapse-iss-video/
A nice timelapse video showing earth as viewed from the ISS.

_________________
Forum RP: Cydonia Rising
[RP]Cydonia Rising [IC]


Sat Dec 27, 2014 8:13 am
Profile
User avatar

Joined: Sat Mar 05, 2011 9:03 am
Posts: 785
Location: Quebec, Canada
Post Re: The Astronomy Thread
the aurora are awesome to look from above


Sat Dec 27, 2014 10:59 pm
Profile WWW

Joined: Thu Mar 24, 2011 12:44 am
Posts: 616
Location: Umeå, Sweden
Post Re: The Astronomy Thread
pretty cool from below too...
but the night time lightning shows how damn powerful those discharges really are.


Sun Dec 28, 2014 3:21 am
Profile
Site Admin
User avatar

Joined: Fri Mar 04, 2011 9:19 pm
Posts: 3090
Location: San Jose, CA
Post Re: The Astronomy Thread
1.5 billion pixel image of Andromeda by Hubble.

_________________
Outsider


Tue Jan 20, 2015 7:19 pm
Profile WWW
User avatar

Joined: Sat Mar 05, 2011 9:03 am
Posts: 785
Location: Quebec, Canada
Post Re: The Astronomy Thread
when your picture cant fit on a 4GB flash drive...


Wed Jan 21, 2015 4:09 pm
Profile WWW
User avatar

Joined: Mon Mar 21, 2011 11:31 am
Posts: 782
Post Re: The Astronomy Thread
Karst45 wrote:
when your picture cant fit on a 4GB flash drive...


... you realize you can't grasp the immensity of the universe.

_________________
Image


Thu Jan 22, 2015 12:01 am
Profile

Joined: Mon Apr 25, 2011 6:04 pm
Posts: 263
Post Re: The Astronomy Thread
We've hit on relativity and dark matter a number of times on this forum, so I know we have a few people with the high level education needed to be able to poke holes in this. I just ran into some work that purports to solve both the expansion/collapse of the universe and the need for dark matter/energy while giving the universe an infinite age through the use of quantum mechanics.

http://phys.org/news/2015-02-big-quantu ... e.html#jCp
No Big Bang? Quantum equation predicts universe has no beginning wrote:
The universe may have existed forever, according to a new model that applies quantum correction terms to complement Einstein's theory of general relativity. The model may also account for dark matter and dark energy, resolving multiple problems at once...

In their paper, Ali and Das applied these Bohmian trajectories to an equation developed in the 1950s by physicist Amal Kumar Raychaudhuri... Using the quantum-corrected Raychaudhuri equation, Ali and Das derived quantum-corrected Friedmann equations, which describe the expansion and evolution of universe (including the Big Bang) within the context of general relativity... In addition to not predicting a Big Bang singularity, the new model does not predict a "big crunch" singularity...




I think I mentioned it before, that this is precisely the sort of thing I wanted to be true, but it seems entirely too neat and tidy. I have to question the feasibility of such a seemingly simple correction fixing all these issues at once. And since I wanted it to be true I don't trust myself to look into it correctly. Well, that and because I am terrible at the math involved at this level.


Tue Feb 10, 2015 6:25 pm
Profile
User avatar

Joined: Sat Mar 05, 2011 1:35 pm
Posts: 1292
Location: Middle of Nowhere
Post Re: The Astronomy Thread
hi hi

It will be interesting to see how they account for entropy.


Tue Feb 10, 2015 7:08 pm
Profile WWW
User avatar

Joined: Fri Jan 24, 2014 5:22 pm
Posts: 369
Post Re: The Astronomy Thread
Except it seems to ignore everything else we know about how the universe came into existence?

I'd like to know how "QUANTUM" explains cosmic background radiation.

_________________
If every cloud had a silver lining, there would be a lot more plane crashes.


Wed Feb 11, 2015 1:04 am
Profile
Moderator
User avatar

Joined: Thu May 12, 2011 8:38 am
Posts: 561
Post Re: The Astronomy Thread
Milky Way may be bigger than we thought.

article wrote:

Surprising new research suggests that our home galaxy is about 50 percent bigger than previously thought, spanning some 150,000 light-years across rather than the 100,000 light-years that has been the generally accepted number.

We know quite a lot about the Milky Way, so how can it be that we're just now realizing that we were so wrong about its size? It turns out that what seemed to be concentric rings of stars surrounding our galaxy's bulging center are instead concentric ripples--and that means the galaxy doesn't end where we thought it did.



Good News Everyone! There's now more galaxy to blow up than ever before! :twisted:

_________________
Image

Spoiler: show
This is my Mod voice. If you see this in a thread, it means that the time for gentle reminders has passed.


Sun Mar 15, 2015 7:28 am
Profile
Site Admin
User avatar

Joined: Fri Mar 04, 2011 9:19 pm
Posts: 3090
Location: San Jose, CA
Post Re: The Astronomy Thread
Not so terribly surprising; when we look at other large spiral galaxies, they often have enormous dim outer components.

Image

_________________
Outsider


Sun Mar 15, 2015 12:52 pm
Profile WWW
User avatar

Joined: Mon Mar 21, 2011 11:31 am
Posts: 782
Post Re: The Astronomy Thread
I wonder if this extra mass tips the balance in favor of the Milky Way instead of the Andromeda Galaxy.

_________________
Image


Sun Mar 15, 2015 1:13 pm
Profile
Site Admin
User avatar

Joined: Fri Mar 04, 2011 9:19 pm
Posts: 3090
Location: San Jose, CA
Post Re: The Astronomy Thread
If it's similar to NGC4911 (pictured above), then I would guess that the mass of the outer section is a tiny percentage of the total mass of the galaxy.

_________________
Outsider


Sun Mar 15, 2015 2:12 pm
Profile WWW
User avatar

Joined: Fri Jan 24, 2014 5:22 pm
Posts: 369
Post Re: The Astronomy Thread
Image

_________________
If every cloud had a silver lining, there would be a lot more plane crashes.


Sun Mar 15, 2015 5:10 pm
Profile
Site Admin
User avatar

Joined: Fri Mar 04, 2011 9:19 pm
Posts: 3090
Location: San Jose, CA
Post Re: The Astronomy Thread
The elliptical galaxy at upper right (PGC 83751, a.k.a. "NGC 4911A") is thought to be an actual companion to NGC 4911 and gravitationally interacting with it, and so it's at roughly the same distance.

What always freaks me out in deep sky images like this (aside from the amazing complexity and beauty of the foreground galaxy itself) are the thousands of galaxies you can see in the background.

_________________
Outsider


Sun Mar 15, 2015 5:51 pm
Profile WWW
Moderator
User avatar

Joined: Thu May 12, 2011 8:38 am
Posts: 561
Post Re: The Astronomy Thread
Arioch wrote:
The elliptical galaxy at upper right (PGC 83751, a.k.a. "NGC 4911A") is thought to be an actual companion to NGC 4911 and gravitationally interacting with it, and so it's at roughly the same distance.

What always freaks me out in deep sky images like this (aside from the amazing complexity and beauty of the foreground galaxy itself) are the thousands of galaxies you can see in the background.


Yeah, that always gets me too. You really get a sense for how unbelievably, mindbogglingly, incomprehensibly enormous the universe really is. It's both belittling and humbling, yet comforting and reassuring at the same time.

Ah who am I kidding. Sagan said it best, even if it was in reference to just Earth and not the sheer number of galaxies and stars we can see.


_________________
Image

Spoiler: show
This is my Mod voice. If you see this in a thread, it means that the time for gentle reminders has passed.


Mon Mar 16, 2015 1:05 am
Profile
User avatar

Joined: Sat Mar 05, 2011 1:35 pm
Posts: 1292
Location: Middle of Nowhere
Post Re: The Astronomy Thread
hi hi

I have been waiting for years for this, but the moment is finally here. Dawn is at Ceres and is starting to take good resolution pictures of the surface. :P


Tue Apr 14, 2015 7:33 pm
Profile WWW

Joined: Thu Mar 12, 2015 5:00 pm
Posts: 460
Post Re: The Astronomy Thread
Apparently we have some farseeing of our own. gas giant HALF the mass of Jupiter detected 13000 light years away!

http://www.dailymail.co.uk/sciencetech/ ... -away.html


Fri Apr 17, 2015 7:07 am
Profile
Site Admin
User avatar

Joined: Fri Mar 04, 2011 9:19 pm
Posts: 3090
Location: San Jose, CA
Post Re: The Astronomy Thread
And New Horizons will be at Pluto in July... it's going to be cool.

_________________
Outsider


Fri Apr 17, 2015 12:57 pm
Profile WWW

Joined: Thu Mar 12, 2015 5:00 pm
Posts: 460
Post Re: The Astronomy Thread
Arioch wrote:
And New Horizons will be at Pluto in July... it's going to be cool.


Pluto have bunch of moons of it's own and they still pulled it's status as a planet. five of them. A mighty dwarf that. http://en.wikipedia.org/wiki/Moons_of_Pluto so yes this will be cool.


Fri Apr 17, 2015 10:35 pm
Profile

Joined: Thu Mar 24, 2011 8:46 pm
Posts: 165
Post Re: The Astronomy Thread
http://www.telegraph.co.uk/news/science ... verse.html

If true, that's an interesting find. And empty space in the universe that is relatively close to our galaxy.


Mon Apr 20, 2015 5:34 pm
Profile
User avatar

Joined: Mon Mar 21, 2011 11:31 am
Posts: 782
Post Re: The Astronomy Thread
Sweforce wrote:
Pluto have bunch of moons of it's own and they still pulled it's status as a planet. five of them. A mighty dwarf that. http://en.wikipedia.org/wiki/Moons_of_Pluto so yes this will be cool.


Why not call the Moon a planet then? Some mighty 'moon' we have there floating in the neighbourhood. I mean, its even more massive then all known dwarf planets combined, and the Sun has more of a gravitational grip on it then Earth... ;)

_________________
Image


Fri Apr 24, 2015 11:20 am
Profile
User avatar

Joined: Sat Mar 05, 2011 1:35 pm
Posts: 1292
Location: Middle of Nowhere
Post Re: The Astronomy Thread
hi hi

That, or you could call the Earth a dwarf planet, since it hasn't cleared its orbit of like objects. ;)


Fri Apr 24, 2015 11:33 am
Profile WWW
Display posts from previous:  Sort by  
Reply to topic   [ 436 posts ]  Go to page Previous  1 ... 6, 7, 8, 9, 10, 11, 12 ... 18  Next

Who is online

Users browsing this forum: No registered users and 5 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group.
Designed by STSoftware for PTF.