A Space & astronomy forum. SpaceBanter.com

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » SpaceBanter.com forum » Astronomy and Astrophysics
Site Map Home Authors List Search Today's Posts Mark Forums Read Web Partners

Post New Thread
Threads in Forum : Research Forum Tools Search this Forum Feed Icon
  Thread / Thread Starter Last Post Reverse Sort Order Replies Views
A new impossible galaxy by jacobnavia
Massive dead disk galaxy challenges theories of galaxy evolution https://www.sciencedaily.com/releases/2017/06/170621145150.htm This galaxy (3 times the mass...
June 23rd 17 04:07 AM
by jacobnavia Go to last post
2 18
entropy and gravitation by Phillip Helbig
A smooth distribution corresponds to high entropy and a lumpy one to low entropy if gravity is not involved. For example, air in a room has high entropy,...
(Multi-page thread 1 2 3)
June 22nd 17 02:54 AM
by Steve Willner Go to last post
27 184
All-Sky Optical catalogue now available for download by Eric Flesch
My publications are coming to an end, methinks, but throughout I was using a homegrown version of an all-sky optical catalogue, the likes of which seem...
June 20th 17 01:52 AM
by Eric Flesch Go to last post
4 118
The impossible early galaxy (continued) by jacobnavia
ZF-COSMOS-20115 A dead galaxy, with 3 time more stars than the milky way. Just 1.65 Gy after the supposed bang. Star formation has shutted down there. And...
May 17th 17 05:26 AM
by jacobnavia Go to last post
2 65
NET Angular Momentum of Globular cluster of stars by No Name
Is the NET angular momentum of a globular cluster of stars, zero? e.g. Omega Centauri or M13 for example. Is the NET angular momentum of an elliptical...
(Multi-page thread 1 2 3)
April 23rd 17 11:59 AM
by Richard D. Saam Go to last post
20 367
How long will star formation endure before the eventual heat death of by Phillip Helbig (undress to reply)[_2_]
In article , James Goetz writes: Lord Kelvin's prediction of heat death...
April 2nd 17 12:46 AM
by jacobnavia Go to last post
4 109
Single vs Double hot spots for BH Jets? (e.g. Pictor A) by No Name
Example object, Pictor A http://chandra.harvard.edu/photo/2016/pictora/ in particular, the x ray Chandra...
(Multi-page thread 1 2)
15 433
Geometry of jets, e.g. Pictor A by No Name
Object e.g. http://chandra.harvard.edu/photo/2016/pictora/ Is there an example of an active galaxy with extended million light year long radio and or xray...
2 213
Cosmic Energy Budget, vs time by [email protected]
Questions (below) relate to total energy (sum of terms) in this paper: In the paper, "The Cosmic Energy Inventory" Fukugita / Peebles, They created a list of...
February 26th 17 04:45 AM
by No Name Go to last post
4 203
Galactic Bar Formation? by No Name
It's been a while since I've explored this topic. Years ago no one had posited this model and I was told it was wrong. I thought I'd check if anything has...
February 26th 17 04:41 AM
by No Name Go to last post
2 137
Different Hubble constants by Richard D. Saam
What are the astrophysical implications of different Hubble constants by Planck https://arxiv.org/abs/1502.01589 Hubble constant 67.8 +/- .9 km/s/Mpc and...
February 9th 17 05:20 PM
by Phillip Helbig (undress to reply)[_2_] Go to last post
7 334
Bluetides simulation by Steve Willner
There was some earlier discussion of how early in the universe galaxies could form. I happened to run across a simulation that gives one...
January 26th 17 07:52 PM
by Steve Willner Go to last post
0 190
How to get scope time to obtain 7 spectra? by [email protected]
Is there any path anyone knows for me to get some scope time to take some spectra and determine what 7 targets around an interacting galaxy pair are? They are...
January 25th 17 06:51 PM
by Mike Dworetsky Go to last post
2 213
The dark ages by jacobnavia
After the big bang, the gas was too hot to form stars. A time must pass to cool the universe so that the star formation could begin. In that period of time...
(Multi-page thread 1 2)
January 25th 17 06:51 PM
by Gary Harnagel Go to last post
10 324
Quasar brightness lower bound, real or my error? by No Name
For this plot of quasar Mag vs z https://inspirehep.net/record/1208042/files/Mi_zdist1_dr10.png There is a lower bound for quasar Mag that looks...
6 292
Plot of SN rate vs z? by No Name
I've found a bunch of SFR plots vs z, but haven't yet found an SN rate vs z plot. Does one exist? Ideally, SNII and SNIa plots separated since each produces...
January 18th 17 05:49 AM
by No Name Go to last post
0 198
What is this galaxy? by [email protected]
Anyone know what kind of galaxy this galaxy might be? http://skyserver.sdss.org/dr13/en/tools/chart/navi.aspx?ra=186.9189&dec=13.076 It has a ring around the...
January 18th 17 05:49 AM
by No Name Go to last post
7 311
Reflections on ULAS J1120+0641 and GN-z11 by No Name
] On Wednesday, December 28, 2016 at 5:14:16 PM UTC-5, jacobnavia wrote: Most of the original snipped ... I worked a few hours for this post, and I think...
January 12th 17 05:01 AM
by No Name Go to last post
3 221
What dictates galaxy and planetary system sizes? by Richard D. Saam
What are the functional relationships dictating galactic size (presently ~10^22 cm) and star planetary system size (presently ~10^15 cm) contained in a Hubble...
(Multi-page thread 1 2)
January 8th 17 04:13 AM
by Phillip Helbig (undress to reply)[_2_] Go to last post
15 382
Reflections on ULAS J1120+0641 and GN-z11 by Steve Willner
In article , jacobnavia writes: https://arxiv.org/pdf/1603.00461.pdf Published in ApJ...
January 7th 17 09:31 AM
by Steve Willner Go to last post
0 198
Post New Thread


Display Options
Showing threads 1 to 20 of 1487
Sorted By Sort Order
From The
Forum Tools Search this Forum
Search this Forum :

Advanced Search

New posts New posts More than 15 replies or 150 views Hot thread with new posts
No new posts No new posts More than 15 replies or 150 views Hot thread with no new posts
Closed Thread Thread is closed  
 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT +1. The time now is 11:35 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright 2004-2017 SpaceBanter.com.
The comments are property of their posters.