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Planet Nine: Astronomers want help from amateur stargazers by Internetado
Planet Nine: Astronomers want help from amateur stargazers An Australian university has asked amateur stargazers to help find a possible ninth...
Yesterday 10:58 PM
by Internetado Go to last post
0 9
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...
Yesterday 09:17 PM
by Steve Willner Go to last post
1 9
New portal to unveil the dark sector of the universe by Internetado
Once upon a time, the Universe was just a hot soup of particles. In those days, together with visible particles, other particles to us hidden or dark might...
March 27th 17 09:12 PM
by Internetado Go to last post
0 19
looking for cosmology review article by Phillip Helbig (undress to reply)[_2_]
As many readers probably know, when it was believed that there were more quasars than expected in a relatively small redshift range, a possible solution...
March 27th 17 05:29 AM
by Phillip Helbig (undress to reply)[_2_] Go to last post
0 15
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)
March 27th 17 05:28 AM
by Phillip Helbig (undress to reply)[_2_] Go to last post
10 79
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)
15 262
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...
2 109
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
4 120
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 64
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
7 220
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 89
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
2 117
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
10 169
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...
6 162
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 93
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
7 146
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
3 127
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
15 232
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
0 102
AGN Luminosity Function as f(z) by [email protected]
Hello, I've so far not found any values for numbers of active galaxies vs normal galaxies across time. What percentage of galaxies go through an active...
January 7th 17 09:31 AM
by Steve Willner Go to last post
3 158
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