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Actual linkage between tectonic-mantle motions and lunar recession speeds? by stargene
Is there an overarching link between the fact that, on the one hand: (1) plate tectonic motions range typically between a few mm/year to about 100 mm/year, &...
August 25th 18 12:51 AM
by Phillip Helbig (undress to reply)[_2_] Go to last post
7 1,136
simple math question about orbital motion by No Name
An acceleration of an orbiting body, in a central force, is defined as: a(r,v) = -k/r^2(1 + v^2/c^2) k = GM = const, v = dr/dt = r' what is the precession...
August 25th 18 12:40 AM
by Bruce Scott Go to last post
1 1,057
Parker Solar Probe by Richard D. Saam
The Eugene Parker Solar Probe has just launched to investigate close up solar magnetic and electric fields. In his book: "Conversations on Electric and...
August 15th 18 06:07 AM
by Richard D. Saam Go to last post
2 1,099
Moderator's Note: delays in article processing in the next 3 days by Jonathan Thornburg [remove -animal to reply][_3_]
Dear newsgroup participants, Due to moderator travel, there may not be any active moderators for the next 3 days. If so, any articles submitted during that...
0 1,027
First stars by Steve Willner
A recent _Nature_ article http://adsabs.harvard.edu/abs/2018Natur.555...67B shows evidence that the first stars appeared by z=20, about 180 Myr after the Big...
(Multi-page thread 1 2)
May 29th 18 04:22 PM
by jacob navia Go to last post
13 2,443
Galaxy cluster at z=4.31 by jacobnavia
ALMA sees very far. And at z=4.31, just 1.4 Gy after the supposed "bang"... it sees a galaxy cluster the mass of the coma...
May 11th 18 09:44 AM
by Steve Willner Go to last post
3 1,411
Missing Baryons by Steve Willner
By coincidence, I ran across a recent paper discussing the "missing baryon"...
April 21st 18 11:15 AM
by Steve Willner Go to last post
0 1,083
Galaxy evolution by jacobnavia
Suppose a normal galaxy like ours. Heavy stars are produced by the galaxy, converting cold gas into black holes or heavy neutron stars. Supernova explosions...
April 14th 18 10:45 AM
by Phillip Helbig (undress to reply)[_2_] Go to last post
9 1,213
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 1,701
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 23rd 18 11:32 PM
by No Name Go to last post
4 1,231
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 08:16 PM
by John Heath Go to last post
1 1,373
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 09:35 PM
by Richard D. Saam Go to last post
3 1,228
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 10:48 AM
by Steve Willner Go to last post
9 1,260
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 08:56 AM
by Steve Willner Go to last post
12 1,743
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 04:34 PM
by Richard D. Saam Go to last post
43 3,025
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 05:51 PM
by Eric Flesch Go to last post
1 990
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 08:40 PM
by Steve Willner Go to last post
6 1,095
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 09:19 AM
by Richard D. Saam Go to last post
6 1,086
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 10:11 PM
by Internetado Go to last post
0 1,012
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 10:10 PM
by Richard D. Saam Go to last post
3 952
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