Search found 21 matches

by epitalon
Sat Mar 27, 2021 9:29 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: The Medusa Nebula (2021 Mar 26)
Replies: 35
Views: 11777

Re: APOD: The Medusa Nebula (2021 Mar 26)

Hi all, would you think that one see a crescent shape because the nebula has this actual shape or because one cannot see another part of it, symetrical. In other words, could the nebula have a rotational symmetry that we could not see or barely see ? In order to find an answer, I processed the image...
by epitalon
Wed Mar 25, 2020 4:39 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Starry Night by Jean-Francois Millet (2020 Mar 13)
Replies: 29
Views: 21636

Re: APOD: Starry Night by Jean-Francois Millet (2020 Mar 13)

Millet has produced a partially accurate painting of the winter night sky. Starting with the belt of Orion, one sees it points down (roughly) to Sirius and can see the other major stars of Canis Major. In the other direction (going up from the belt) the accuracy seems to fail, as it looks like Alde...
by epitalon
Wed Mar 25, 2020 4:27 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Starry Night by Jean-Francois Millet (2020 Mar 13)
Replies: 29
Views: 21636

Re: APOD: Starry Night by Jean-Francois Millet (2020 Mar 13)

I agree, then the blurry stars below them and at top right wouldn't be far out of place for Orion's sword and the Pleiades. Maybe Procyon for the bright star on the left? To me, Sirius, rather than Procyon, is more "in-line" with Orion's Belt. Looks like Procyon and Orion's Belt to me. Ot...
by epitalon
Mon Sep 30, 2019 10:04 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Orion Rising over Brazil (2019 Sep 30)
Replies: 23
Views: 7321

Re: APOD: Orion Rising over Brazil (2019 Sep 30)

Hello all,
Really a beautiful photograph !
To me, it is striking how many stars are aligned in a stream going roughly from Mintaka to the Great Orion's nebula, along the Orion's sword.
And from all the Orion's belt, stars seem to be aligned in the same direction as the Orion's sword.
by epitalon
Sat Oct 01, 2016 4:22 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Rosetta's Farewell (2016 Oct 01)
Replies: 45
Views: 13195

Re: APOD: Rosetta's Farewell (2016 Oct 01)

I have a couple of questions : Was it was not possible to let Rosetta sleep for some years until the comet returns ? Would it stay in orbit around the comet all this time ? Would the battery or some other component be damaged by the cold at Jupiter's distance from the sun ? So would it be a dead spa...
by epitalon
Tue Dec 01, 2015 8:01 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Gravity's Grin (2015 Nov 27)
Replies: 27
Views: 4665

Re: APOD: Gravity's Grin (2015 Nov 27)

epitalon wrote: Do we happen see many streams of galaxy that are not aligned with our's ? To me, the most interresting point is : Is our galaxy the center of the universe ? We humans are at the center of our own universe. From our own vantage point, everything seems to point in our direction. Ann T...
by epitalon
Sat Nov 28, 2015 9:28 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Gravity's Grin (2015 Nov 27)
Replies: 27
Views: 4665

Re: APOD: Gravity's Grin (2015 Nov 27)

Thus, while there are lots of images and examples, it takes special circumstances, and those are rather rare. Of course, it depends on how you choose to define "common" (or "rare"). There are dozens (or even hundreds) of examples of visible lensed structures (but of course, take...
by epitalon
Mon Mar 09, 2015 5:34 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: NGC 602 in the Flying Lizard Nebula (2015 Mar 07)
Replies: 22
Views: 100034

Re: APOD: NGC 602 in the Flying Lizard Nebula (2015 Mar 07)

I mean, where is, for example, the Aquaman in Aquarius ?) That one I can answer (sort of). Here is the interpretation of the Water Bearer from Stellarium , at least: I believe that Aquarius is also named "Water pitcher" or in french Verseau, meaning "Water pourer". I could imagi...
by epitalon
Tue Jan 20, 2015 1:28 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Approaching Asteroid Ceres (2015 Jan 20)
Replies: 29
Views: 40062

Re: APOD: Approaching Asteroid Ceres (2015 Jan 20)

hello, my post is relatively unrelated to Ceres, rather loosely related to Dawn spacecraft. I found on Dawn website a simulated view of our inner solar system from Dawn, in which some stars from Orion and Taurus constellations are depicted. See http://dawn.jpl.nasa.gov/mission/live_shots.asp In this...
by epitalon
Wed Sep 10, 2014 1:16 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Laniakea: Our Home Supercluster of... (2014 Sep 10)
Replies: 64
Views: 145678

Re: APOD: Laniakea: Our Home Supercluster of... (2014 Sep 10

What strikes me is the fact that many streams of white dots seem to converge to our galaxy and nobody seems to care of that ???
Would our galaxy be at the center of the Universe ?

Also, please, I would like to know if we see just a cutting plane or a projection on a plane ?
by epitalon
Mon Apr 22, 2013 3:56 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: The Horsehead Nebula in Infrared... (2013 Apr 22)
Replies: 38
Views: 8956

Re: APOD: The Horsehead Nebula in Infrared... (2013 Apr 22)

Please can someone answer this question:

are they three channels of infrared seen in false colors,
or is it simply red channel replaced by infrared ?

Thanks
by epitalon
Fri Feb 22, 2013 4:17 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: The Great Russian Meteor of 2013 (2013 Feb 18)
Replies: 72
Views: 27308

Re: Coincidence with 2012 DA14

This is only possible if the body is in orbit around the Earth in the first place. Otherwise it doesn't have a perigee at all. A body in a solar orbit can't be captured by the Earth except by aerobraking- losing energy after dipping into the atmosphere. Such a meteor can, potentially, touch the atm...
by epitalon
Fri Feb 22, 2013 10:50 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: The Great Russian Meteor of 2013 (2013 Feb 18)
Replies: 72
Views: 27308

Re: Coincidence with 2012 DA14

Hello all, I would like to know something, please: what are the conditions on velocity, relative to earth, if any, for an asteroid to enter earth atmosphere after half a U-turn around earth. I mean: could an asteroid have a parabole or an elongated elipse trajectory, relative to earth, and enter ear...
by epitalon
Fri May 25, 2012 3:49 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Scorpius in Red and Blue (2012 May 25)
Replies: 15
Views: 2957

Re: APOD: Scorpius in Red and Blue (2012 May 25)

Hi all, I would like to know, please: Does a dust cloud block Halpha light ? Does a Hydrogen cloud block blue reflection light ? It seems to me that dust clouds around Delta Scorpii are in front of hydrogen clouds because they seem to dim the red light.... Am I right ? Last but not least question : ...
by epitalon
Sun Jan 15, 2012 1:49 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Infrared Portrait of the Large Cloud... (2012 Jan 15)
Replies: 23
Views: 3981

Re: APOD: Infrared Portrait of the Large Cloud... (2012 Jan

Has anyone ever submitted the idea that the Magellanic clouds are emitted from our galaxy ? What about the idea that spiral galaxies are like garden sprinklers ? Their bulge or "kernel" would rotate at a fix speed, holding together all of its matter and stars by some force other than gravi...
by epitalon
Tue Jul 13, 2010 6:29 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: M13: The Great Globular Cluster in... (2010 May 27)
Replies: 28
Views: 3788

Re: APOD: M13: The Great Globular Cluster in... (2010 May 27

I've pulled the image from that site and attached it here, Thanks for that and for taking my thoughts in consideration. But honestly, I think I can draw a few other lines that would do this, as well. Me too : on this particular cluster and on some other (at least one other)... The fact that I can s...
by epitalon
Tue Jul 13, 2010 2:35 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: M13: The Great Globular Cluster in... (2010 May 27)
Replies: 28
Views: 3788

Re: APOD: M13: The Great Globular Cluster in... (2010 May 27

Here is a marked picture of M13 :
https://rcpt.yousendit.com/908399617/14 ... b31d2b7698

I use "YouSendIt" to post this picture : the above link is availlable till july 20th.
Regards
by epitalon
Mon Jul 12, 2010 7:37 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: M13: The Great Globular Cluster in... (2010 May 27)
Replies: 28
Views: 3788

Re: APOD: M13: The Great Globular Cluster in... (2010 May 27

Thanks, Art, for your quick reponse. I am able to see the same characteristic in some other images of M13, not all. I marked the images with pointers to the discontinuity that I see. I don't want to pollute this forum with images. If you want to see them, just ask. It is probably a simple alignment ...
by epitalon
Sun Jul 11, 2010 4:16 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: M13: The Great Globular Cluster in... (2010 May 27)
Replies: 28
Views: 3788

2010 May 27: M13: The Great Globular Cluster in Hercules

Hi, as a geologist, I am used to detect the trace of a fault in the landscape : discontinuity caused by the fault appears in the relief, vegetation, ... A fault usually follows a straight line. It seems to me that I can see such a straight line of discontinuities accross the top part of M13 globular...