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Search: Posts made by: jacobnavia
Forum: Research April 6th 21, 06:48 PM Posted to sci.physics.research,sci.astro.research
Replies: 0
Views: 92
Posted By jacobnavia
How well do we know the value of G?

Le 10/03/2021 11:09, Phillip Helbig (undress to reply) a écrit :

How well do we know the value of G?

G is the constant (well, as far as we know) of nature whose value is
known with the...
Forum: Research December 23rd 20, 09:46 AM Posted to sci.astro.research
Replies: 1
Views: 551
Posted By jacobnavia
MOND confirmed

In a paper in the Astrophysical Journal, (The Astrophysical Journal,
904:51 (20pp), 2020 November 20) several researches cnfirm MOND's
prediction of 1984: the External Field Effect (EFE) has been...
Forum: Research March 14th 19, 02:29 AM Posted to sci.astro.research
Replies: 1
Views: 837
Posted By jacobnavia
supermassive black holes at z 7

A team of astronomers have conducted a search for distant super massive
black holes and they have found 83 of them....
Forum: Research January 13th 19, 08:45 PM Posted to sci.astro.research
Replies: 4
Views: 1,435
Posted By jacobnavia
LIGO sensitivity compared with the human eye

Le 12/01/2019 =C3=A0 12:01, Jos Bergervoet a =C3=A9crit=C2=A0:

The human eye can detect a SINGLE PHOTON...

See:

Direct detection of a single photon by...
Forum: Research November 28th 18, 05:43 AM Posted to sci.astro.research
Replies: 17
Views: 1,711
Posted By jacobnavia
dark matter hypothesis

Le 26/11/2018 à 19:49, a écrit :
[[Mod. note -- Microlensing studies show that at most a small fraction
of the dark matter in the Milky Way's halo can be in compact...
Forum: Research November 3rd 18, 08:35 PM Posted to sci.astro.research
Replies: 12
Views: 1,920
Posted By jacobnavia
Spaceship Oumuamua

Oumuamua wasn't a "traditional" spaceship but it is a solar sail.

https://arxiv.org/pdf/1810.11490.pdf

This point of view is proposed by reearchers Shmuel Bialy and Prof.
Abraham Loeb.

Oumuamua...
Forum: Research October 28th 18, 08:47 PM Posted to sci.astro.research
Replies: 2
Views: 825
Posted By jacobnavia
interesting dark-matter candidate

Le 27/10/2018 à 18:50, Phillip Helbig (undress to reply) a écrit :
I'm now at a cosmology conference:
https://indico.cern.ch/event/736594/overview

One reason to go to a conference is to hear...
Forum: Research July 10th 18, 06:40 AM Posted to sci.astro.research
Replies: 12
Views: 1,920
Posted By jacobnavia
Spaceship Oumuamua

Le 09/07/2018 Ã* 20:42, Eric Flesch a écritÂ*:
For interstellar travel, the Sun itself can be used for a slingshot
assist for (say) travelling outwards in the Galactic disk. The key
question,...
Forum: Research July 2nd 18, 06:08 AM Posted to sci.astro.research
Replies: 12
Views: 1,920
Posted By jacobnavia
Spaceship Oumuamua

Le 01/07/2018 à 19:37, Richard D. Saam a écrit:
m/t = F/v = 1.39 x 10^8/41,000 = 3,400 g/sec or 3.4 kg/sec

OK, but this thing has been accelerating for months... Suppose just 4
months. At this...
Forum: Research June 28th 18, 10:13 PM Posted to sci.astro.research
Replies: 12
Views: 1,920
Posted By jacobnavia
Spaceship Oumuamua

Oumuamua is leaving us at high speed.

Humans try to follow it with the VLT, and they report that the thing...
is accelerating.

Accelerating?

When I first saw the drawings I thought:

Gosh! This...
Forum: Research May 21st 18, 01:49 PM Posted to sci.astro.research
Replies: 13
Views: 1,988
Posted By jacobnavia
First stars

Le 19/05/2018 Ã* 11:09, Phillip Helbig (undress to reply) a écritÂ*:
The star mentioned above has oxygen, what implies at least several
generations of stars to produce it,
Why? One...
Forum: Research May 20th 18, 07:40 AM Posted to sci.astro.research
Replies: 13
Views: 1,988
Posted By jacobnavia
First stars

Le 19/05/2018 à 11:09, Phillip Helbig (undress to reply) a écrit :
Again, you are assuming a specific model, based on essentially no
information.

I am assuming that a quasar can be fed only...
Forum: Research May 20th 18, 07:39 AM Posted to sci.astro.research
Replies: 13
Views: 1,988
Posted By jacobnavia
First stars

Le 19/05/2018 Ã* 11:09, Phillip Helbig (undress to reply) a écritÂ*:
Maybe primordial black holes coalesced.

This hasn't been observed. Primordial black holes are very hypothetical
and micro...
Forum: Research May 19th 18, 09:07 AM Posted to sci.astro.research
Replies: 13
Views: 1,988
Posted By jacobnavia
First stars

Le 18/05/2018 Ã* 20:50, Bringfried Stecklum a écritÂ*:
On 16.05.2018 13:22, Steve Willner wrote:
A recent _Nature_ article
http://adsabs.harvard.edu/abs/2018Natur.555...67B
shows evidence...
Forum: Research May 4th 18, 05:32 AM Posted to sci.astro.research
Replies: 3
Views: 1,144
Posted By jacobnavia
Galaxy cluster at z=4.31

Le 03/05/2018 à 22:37, Steve Willner a écrit :
Did you miss Fig 2 (right panel) in the paper? The mass is
consistent with model expectations.

Well, I detect that I look at what I want to see,...
Forum: Research April 27th 18, 09:49 PM Posted to sci.astro.research
Replies: 3
Views: 1,144
Posted By jacobnavia
Galaxy cluster at z=4.31

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...
Forum: Research April 14th 18, 12:13 AM Posted to sci.astro.research
Replies: 9
Views: 937
Posted By jacobnavia
Galaxy evolution

I wrote:
Normal stuff, what I think you call "baryonic". Yes, I would say the
normal stuff density could be much higher than what we think.

You answered:

No, it can't. Read up on...
Forum: Research April 9th 18, 05:27 AM Posted to sci.astro.research
Replies: 9
Views: 937
Posted By jacobnavia
Galaxy evolution

Le 08/04/2018 Ã* 22:16, Phillip Helbig (undress to reply) a écritÂ*:
In article , jacobnavia
writes:

Heavy stars are produced by the...
Forum: Research April 7th 18, 10:21 PM Posted to sci.astro.research
Replies: 13
Views: 1,319
Posted By jacobnavia
Darker and darker

An important "proof" for dark matter has vanished: Astronomers take back
the observation that a cluster was missing its dark matter, "left
behind". See:
Royal Astronomical Society. "Dark matter...
Forum: Research April 7th 18, 10:20 PM Posted to sci.astro.research
Replies: 9
Views: 937
Posted By jacobnavia
Galaxy evolution

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 aren't symmetric, most stars receive a...
Forum: Research January 24th 18, 10:55 PM Posted to sci.astro.research
Replies: 12
Views: 1,372
Posted By jacobnavia
Trouble For Dark Energy Hypothesis?

Le 23/01/2018 22:33, Steve Willner a écrit :
In article ,
Gary Harnagel writes:
The neutrino flux would be...
Forum: Research January 16th 18, 10:30 PM Posted to sci.astro.research
Replies: 9
Views: 980
Posted By jacobnavia
Astronomy and Biology

Le 07/01/2018 à 16:52, jacobnavia a écrit :
We have to get to the same level when looking for alien life. If you are
convinced that it doesn't exist, you will never find it.


The answers I...
Forum: Research January 12th 18, 10:09 AM Posted to sci.astro.research
Replies: 9
Views: 980
Posted By jacobnavia
Astronomy and Biology

Le 10/01/2018 =C3=A0 22:09, brad a =C3=A9crit=C2=A0:
There is ample evidence for abiotic methane. This has been suspected
for quite some time. I believe first proposed by Soviet Geologists in
...
Forum: Research January 10th 18, 09:08 PM Posted to sci.astro.research
Replies: 43
Views: 2,404
Posted By jacobnavia
A quasar, too heavy to be true

Le 01/01/2018 Ã* 17:09, Eric Flesch a écritÂ*:
but if we vanished
tomorrow

That's one way of seeing the future.

Personally, I do not think that we will vanish tomorrow.

Why would we?
Forum: Research January 7th 18, 03:52 PM Posted to sci.astro.research
Replies: 9
Views: 980
Posted By jacobnavia
Astronomy and Biology

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 taken the smallest part of exploration,...
Showing results 1 to 25 of 104

 
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