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Search: Posts made by: Martin Brown
Forum: Research March 1st 17, 09:43 PM Posted to sci.astro.research
Replies: 15
Views: 1,092
Posted By Martin Brown
Single vs Double hot spots for BH Jets? (e.g. Pictor A)

On 26/02/2017 04:43, wrote:
On Thursday, February 23, 2017 at 7:47:09 AM UTC-8, Martin Brown
The general theory is that as galaxies age they mature towards having a
...
Forum: Research February 23rd 17, 03:47 PM Posted to sci.astro.research
Replies: 2
Views: 452
Posted By Martin Brown
Galactic Bar Formation?

On 22/02/2017 20:03, wrote:
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...
Forum: Research February 23rd 17, 03:47 PM Posted to sci.astro.research
Replies: 15
Views: 1,092
Posted By Martin Brown
Single vs Double hot spots for BH Jets? (e.g. Pictor A)

On 20/02/2017 19:50, wrote:
On Wednesday, February 8, 2017 at 7:45:27 AM UTC-8, Martin Brown wrote:
On 06/02/2017 05:56, wrote:
On Tuesday,...
Forum: Amateur Astronomy February 23rd 17, 09:25 AM Posted to sci.astro.amateur
Replies: 47
Views: 986
Posted By Martin Brown
Planet near Proxima Centauri (Travel time)

On 22/02/2017 18:41, StarDust wrote:
On Saturday, December 31, 2016 at 1:48:33 AM UTC-8, RichA wrote:
Earth-like? I'd believe it when they get there. Here's the travel
time:

-Current...
Forum: Amateur Astronomy February 22nd 17, 10:28 AM Posted to sci.astro.amateur
Replies: 47
Views: 986
Posted By Martin Brown
Planet near Proxima Centauri (Travel time)

On 21/02/2017 22:35, Quadibloc wrote:
On Sunday, February 19, 2017 at 9:00:14 PM UTC-7, BogeyOne wrote:

My thinking is that science is not capable of everything and visiting
even the...
Forum: Amateur Astronomy February 8th 17, 09:17 PM Posted to sci.astro.amateur
Replies: 11
Views: 484
Posted By Martin Brown
Give it away

On 08/02/2017 20:10, wrote:

Someone in the family is bound to know which item(s) in a collection
are truly valuable and truly historic. A museum will want this
...
Forum: Research February 8th 17, 03:53 PM Posted to sci.astro.research
Replies: 7
Views: 636
Posted By Martin Brown
Different Hubble constants

On 03/02/2017 23:06, Steve Willner wrote:
In article ,
"Phillip Helbig (undress to reply)" writes:
The real question is whether...
Forum: Research February 8th 17, 03:45 PM Posted to sci.astro.research
Replies: 15
Views: 1,092
Posted By Martin Brown
Single vs Double hot spots for BH Jets? (e.g. Pictor A)

On 06/02/2017 05:56, wrote:
On Tuesday, January 24, 2017 at 9:06:13 AM UTC-8, Martin Brown wrote:
On 23/01/2017 22:45, wrote:
On Friday, January...
Forum: Amateur Astronomy February 2nd 17, 03:34 PM Posted to sci.astro.amateur
Replies: 11
Views: 484
Posted By Martin Brown
Give it away

On 01/02/2017 01:27, BogeyOne wrote:

Are you "telescoped out?" The symptom of which would be not having had
the urge to get under the night sky with your scope for a long time
(like years),...
Forum: Amateur Astronomy February 2nd 17, 01:37 PM Posted to sci.astro.amateur
Replies: 1
Views: 231
Posted By Martin Brown
SNOLAB: Inside the Dark Matter Lab Buried Over a Mile Underground

On 02/02/2017 12:12, StarDust wrote:

https://www.youtube.com/watch?v=kCpVMc1PdhM

Dark matter underground, eh?

It is the only way to escape from the surface radiation noise.

Only neutrinos...
Forum: Research January 24th 17, 09:18 PM Posted to sci.astro.research
Replies: 10
Views: 801
Posted By Martin Brown
The dark ages

On 23/01/2017 03:50, wrote:
On Monday, January 2, 2017 at 10:03:49 PM UTC-8, jacobnavia wrote:
After the big bang, the gas was too hot to form stars. A time must pass
...
Forum: Research January 24th 17, 05:06 PM Posted to sci.astro.research
Replies: 15
Views: 1,092
Posted By Martin Brown
Single vs Double hot spots for BH Jets? (e.g. Pictor A)

On 23/01/2017 22:45, wrote:
On Friday, January 20, 2017 at 8:44:02 AM UTC-8, Martin Brown wrote:
On 19/01/2017 03:53, wrote:
Example object,...
Forum: Research January 20th 17, 04:44 PM Posted to sci.astro.research
Replies: 15
Views: 1,092
Posted By Martin Brown
Single vs Double hot spots for BH Jets? (e.g. Pictor A)

On 19/01/2017 03:53, wrote:
Example object, Pictor A
http://chandra.harvard.edu/photo/2016/pictora/

in particular, the x ray Chandra image:
...
Forum: Research January 20th 17, 04:43 PM Posted to sci.astro.research
Replies: 2
Views: 639
Posted By Martin Brown
Geometry of jets, e.g. Pictor A

On 19/01/2017 03:53, wrote:
Object e.g.
http://chandra.harvard.edu/photo/2016/pictora/

Is there an example of an active galaxy with extended million light
year long...
Forum: Amateur Astronomy January 20th 17, 09:12 AM Posted to sci.astro.amateur
Replies: 20
Views: 632
Posted By Martin Brown
any way to use Amazon Fire tablet in front of telescope ep?

On 20/01/2017 01:01, RichA wrote:
On Wednesday, 18 January 2017 12:01:17 UTC-5, Chris L Peterson wrote:
On Wed, 18 Jan 2017 08:10:56 -0800 (PST), wrote:

On...
Forum: Amateur Astronomy January 12th 17, 04:17 PM Posted to sci.astro.amateur
Replies: 40
Views: 902
Posted By Martin Brown
Explore Scientific 12" f/5 Truss Tube Dobsonian Telescope

On 12/01/2017 16:04, wrote:
On Thursday, January 12, 2017 at 6:40:21 AM UTC-5, Martin Brown wrote:

It was easily outclassed by a 4" refractor or an 8"
SCT both...
Forum: Amateur Astronomy January 12th 17, 11:40 AM Posted to sci.astro.amateur
Replies: 40
Views: 902
Posted By Martin Brown
Explore Scientific 12" f/5 Truss Tube Dobsonian Telescope

On 06/01/2017 11:42, wrote:
On Friday, January 6, 2017 at 5:21:56 AM UTC-5, Martin Brown wrote:
On 05/01/2017 21:03, wrote:
On Thursday, January 5,...
Forum: Amateur Astronomy January 12th 17, 11:04 AM Posted to sci.astro.amateur
Replies: 39
Views: 735
Posted By Martin Brown
Time for stabilization to be incorporated into telescopes

On 09/01/2017 01:10, RichA wrote:
Image stabilization. To damp images in case of wind, or touching the
scope to reduce or eliminate damp-time, using high-power eyepieces,
taking images. ...
Forum: Amateur Astronomy January 6th 17, 04:22 PM Posted to sci.astro.amateur
Replies: 2
Views: 236
Posted By Martin Brown
Empty Space is NOT Empty

On 06/01/2017 14:14, StarDust wrote:

https://www.youtube.com/watch?v=J3xLuZNKhlY&lc=z12gxbjjvpyewfb5404cev0g3tybvv1x2gw

So, is it empty or not empty?
That is the question!

Not empty....
Forum: Amateur Astronomy January 6th 17, 12:32 PM Posted to sci.astro.amateur
Replies: 687
Views: 6,541
Posted By Martin Brown
Climate change could cause mass exodus by mid century

On 20/12/2016 18:12, Quadibloc wrote:
On Tuesday, December 20, 2016 at 9:26:00 AM UTC-7, Chris.B wrote:

Do fighter pilots need computers to fly their planes?
No, of course not!

Trust...
Forum: Amateur Astronomy January 6th 17, 10:21 AM Posted to sci.astro.amateur
Replies: 40
Views: 902
Posted By Martin Brown
Explore Scientific 12" f/5 Truss Tube Dobsonian Telescope

On 05/01/2017 21:03, wrote:
On Thursday, January 5, 2017 at 3:23:48 PM UTC-5, Martin Brown wrote:
On 05/01/2017 11:13, wrote:
On Wednesday, January...
Forum: Research January 6th 17, 04:06 AM Posted to sci.astro.research
Replies: 7
Views: 946
Posted By Martin Brown
What is this galaxy?

On 01/01/2017 03:47, wrote:
There are also 12 notes, one of
which says, in part "Because of the dust, it is also impossible to
assess the presence of a nucleus".

...
Forum: Amateur Astronomy January 5th 17, 08:23 PM Posted to sci.astro.amateur
Replies: 40
Views: 902
Posted By Martin Brown
Explore Scientific 12" f/5 Truss Tube Dobsonian Telescope

On 05/01/2017 11:13, wrote:
On Wednesday, January 4, 2017 at 12:34:25 PM UTC-5, Martin Brown wrote:
On 01/01/2017 08:43, palsing wrote:
On Saturday, December 31, 2016 at...
Forum: Amateur Astronomy January 4th 17, 05:34 PM Posted to sci.astro.amateur
Replies: 40
Views: 902
Posted By Martin Brown
Explore Scientific 12" f/5 Truss Tube Dobsonian Telescope

On 01/01/2017 08:43, palsing wrote:
On Saturday, December 31, 2016 at 11:40:32 PM UTC-8,
wrote:

I stated the correct spelling of "richest field telescope" which is
...
Forum: Amateur Astronomy January 4th 17, 01:56 PM Posted to sci.astro.amateur
Replies: 25
Views: 445
Posted By Martin Brown
60mm refractors are good

On 03/01/2017 11:18, wrote:
On Monday, January 2, 2017 at 9:01:45 AM UTC-5, Quadibloc wrote:
On Monday, January 2, 2017 at 1:34:12 AM UTC-7, Chris.B wrote:

If only...
Showing results 1 to 25 of 500

 
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