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A quasar, too heavy to be true by jacobnavia
https://www.nature.com/articles/nature25180 https://arxiv.org/abs/1712.01860 -- jt]] Here we report observations of the quasar ULAS J134208.10+092838.61...
Today 08:12 AM
by Eric Flesch Go to last post
1 10
Speedometer by jacobnavia
Imagine this: You are jogging and want to know your speed. Easy. Measure the CMB from all directions, and you will see that the CMB becomes bluer in the...
Today 07:52 AM
by John Heath Go to last post
1 8
'Oumuamua by Richard D. Saam
'Oumuamua has a rotation period of 8.1 hours, similar to Kuiper Belt objects implying a common origin in the vast depths of interstellar/intergalactic...
November 27th 17 10:08 PM
by John Heath Go to last post
3 75
Apparent equality between Jovian esc. velocities and Sol's esc. vel. by stargene
Okay, I've never heard anything about this before=E2=80=A6Somebody = please explain this: In scanning the wikipedia entry on "Escape Velocity",...
November 27th 17 10:06 PM
by Libor 'Poutnik' Stříž Go to last post
3 17
Addition of grav'l potentials? by stargene
An impossible question? I would like to know if there is a straightforward way of calculating the sum of two different gravitational potentials U and V at...
November 27th 17 10:06 PM
by [email protected] Go to last post
4 87
Verifying by jacobnavia
If there is anew kind of attractive force, unknown to us, that pulls matter together, we should be able to see some effects of this feeble force in our...
(Multi-page thread 1 2)
November 18th 17 09:45 AM
by jacobnavia Go to last post
13 101
Dark matter is: by jacobnavia
As I read in the press, we have found a great percentage of dark matter. Astronomers have suceeded in seeing the shadows of filaments in the light of the CMB....
(Multi-page thread 1 2 3 ... Last Page)
November 13th 17 07:00 AM
by Phillip Helbig (undress to reply)[_2_] Go to last post
33 193
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 ... Last Page)
November 13th 17 06:30 AM
by Phillip Helbig Go to last post
30 525
WIMPs by Steve Willner
There have been many discussions here about WIMPs and searches for them. Today's CfA Colloquium given by Dan Hooper of Fermilab offered a good overview of the...
October 27th 17 03:41 AM
by Phillip Helbig (undress to reply)[_2_] Go to last post
2 48
Ratio baryonic versus non-baryonic matter in the Universe. by Nicolaas Vroom
The article: https://www.newscientist.com/article/2149742-half-the-universes-missing-matter-has-just-been-finally-found/ claims that: "Half the universe's...
October 25th 17 07:06 AM
by Phillip Helbig (undress to reply)[_2_] Go to last post
1 35
Google Scholar Citations: need contact address for bugs by Phillip Helbig
Does anyone know how to contact a real person in order to report bugs in Google Scholar Citations? In my own case (and certainly in that of many others as...
October 15th 17 03:08 PM
by Phillip Helbig Go to last post
0 69
Spectral line changes? by No Name
] Question: Is the spectral line signal for hydrogen different for hydrogen in hydrogen gas compared with hydrogen in water? Or, if one were observing the...
October 5th 17 04:31 PM
by John Heath Go to last post
5 238
Cassini mission end by Bruce D. Scott[_2_]
In sci.astro.research Steve Willner wrote: | As most of us probably know, the Cassini mission to Saturn will end | with the Grand...
September 23rd 17 08:03 PM
by root[_2_] Go to last post
1 97
Acceleration by jacobnavia
A sample of 23 galaxies just 800 million years after the big bang was published by a team of astronomers: https://arxiv.org/abs/1703.02985v3 The article is...
September 21st 17 07:22 AM
by Edward Prochak Go to last post
4 138
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...
September 8th 17 07:46 AM
by Phillip Helbig (undress to reply)[_2_] Go to last post
8 211
Milliquas v5.2 includes SDSS DR14 by Eric Flesch
The Million Quasars (Milliquas) catalogue presents a new release, v5.2, which includes just-published SDSS-DR14 and SDSS-DR14Q data. The count of type-I...
August 15th 17 07:49 AM
by Richard D. Saam Go to last post
1 163
The telescopes of the future by jacobnavia
Caltech has demonstrated a camera without lenses. https://petapixel.com/2017/06/22/caltech-made-sensor-lensless-camera-future/ quote The camera has an...
August 9th 17 06:54 AM
by Martin Brown[_3_] Go to last post
4 152
Will galactic filament indefinitely expand while its galaxy clusters by James Goetz
reference to learn more about event horizons: http://cfpa.berkeley.edu/Education/BHfaq.html -- jt]] Good point about black holes. I neglected that...
July 15th 17 09:59 PM
by James Goetz Go to last post
0 147
Type II or NELG? by Eric Flesch
I can't seem to find a definitive distinction between a galaxy with a type-II narrow-line AGN core and a so-called NELG ("narrow emission-line galaxy"). NELGs...
July 14th 17 12:18 AM
by Steve Willner Go to last post
3 173
Will galactic filament indefinitely expand while its galaxy clusters by James Goetz
I emailed the question to the paper coauthor Michael Hudson, and he replied: In a nutshell, the filaments, like the rest of the Universe will still expand...
July 12th 17 09:10 PM
by James Goetz Go to last post
0 99
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