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NGC1052-DF2 Diffuse Galaxy without dark matter by Martin Brown[_2_]
] What do people think of the recent claim in Nature that one of the new wide field instruments has found a candidate diffuse galaxy NGC1052-DF2 which...
(Multi-page thread 1 2)
April 13th 18 06:37 PM
by Homo Lykos Go to last post
13 1,251
Solar Flare Imaging for Amateurs by [email protected]
Amateur solar flare imaging is on my list of things to do. The problem becomes how to size and control a sun cover disk in the telescope. This is the...
March 24th 18 12:32 AM
by No Name Go to last post
4 905
Big Bang question by John Heath
There are 2 rocks in space. As a result of big bang the universe is expanding. Is it the vacuum that is expanding therefor the distance between the rocks or is...
March 1st 18 09:16 PM
by John Heath Go to last post
1 1,044
Galaxy mass accuracy? (Andromeda..) by Jos bergervoet
"Just how big is the Andromeda galaxy?" (astronomy.com) http://astronomy.com/news/magazine/2018/02/adromeda-is-the-same-size-as-the-milky-way If the mass...
February 25th 18 10:35 PM
by Richard D. Saam Go to last post
3 896
Astronomy and Biology by jacobnavia
They meet in Mars exploration. Since quite a time, humans are roving the planet, "looking for life". Sadly, I think that this is not the case. Biology has...
January 28th 18 11:48 AM
by Steve Willner Go to last post
9 932
Trouble For Dark Energy Hypothesis? by Jonathan Thornburg [remove -animal to reply][_3_]
] Gary Harnagel wrote: I'm having trouble picturing why we should see the CMBR at all. Since it's traveling at the speed of light but...
(Multi-page thread 1 2)
January 28th 18 09:56 AM
by Steve Willner Go to last post
12 1,289
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...
(Multi-page thread 1 2 3 ... Last Page)
January 25th 18 05:34 PM
by Richard D. Saam Go to last post
43 2,289
Eddington Limit cited on PBS Nova by root[_2_]
The most recent program of PBS Nova considered how massive black holes could have been formed in the early universe. It was concluded that they could not have...
January 15th 18 06:51 PM
by Eric Flesch Go to last post
1 721
Discovery of non-transiting exo planets possible? by David Spain
Kepler uses dip in light curves of stars to determine the existence of exo-planets, but that presumption is that these "exo" solar systems have their...
January 11th 18 09:40 PM
by Steve Willner Go to last post
6 812
A quasar, too heavy to be true by Gary Harnagel
On Monday, January 1, 2018 at 9:19:09 AM UTC-7, Phillip Helbig (undress to reply) wrote: In article...
January 5th 18 10:19 AM
by Richard D. Saam Go to last post
6 810
Interstellar object may hold 'alien' water by Internetado
] Interstellar object may hold 'alien' water The first known interstellar asteroid may hold water from another star system in its interior, according...
December 21st 17 11:11 PM
by Internetado Go to last post
0 732
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...
December 21st 17 11:10 PM
by Richard D. Saam Go to last post
3 680
'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
3 956
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
3 719
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
4 831
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 1,194
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 1,860
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 2,248
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
2 665
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
1 514
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