Search found 31 matches
- Wed Jan 01, 2020 9:51 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Betelgeuse Imagined (2020 Jan 01)
- Replies: 46
- Views: 19502
Re: APOD: Betelgeuse Imagined (2020 Jan 01)
Could it be this confluence of cycles that triggers Betelguese?
- Sat Nov 23, 2019 4:01 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Orion Rising (2019 Nov 22)
- Replies: 5
- Views: 2691
Re: APOD: Orion Rising (2019 Nov 22)
I like how the reflection makes it that much easier to actually pick out the stars that make up Orion per se.
- Sat Nov 23, 2019 4:00 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Messier 61 Close Up (2019 Aug 28)
- Replies: 18
- Views: 9642
Re: APOD: Messier 61 Close Up (2019 Aug 28)
Galactic cores are usually quite compact, but the yellowish, elongated bulge (really a bar) of M61 is not that small. Not sure what you're identifying as the elongated bulge - I'm looking at the tiny, circular as far as I can tell, bright central spot that the dust lanes come right up to and touch ...
- Thu Nov 21, 2019 10:50 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Messier 61 Close Up (2019 Aug 28)
- Replies: 18
- Views: 9642
Re: APOD: Messier 61 Close Up (2019 Aug 28)
To my eye, that core region looks abnormally small - is that an effect of the wavelength, or is the core just unusually compact? Galactic cores are usually quite compact, but the yellowish, elongated bulge (really a bar) of M61 is not that small. Not sure what you're identifying as the elongated bu...
- Thu Nov 21, 2019 10:44 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Arp 273: Battling Galaxies from Hubble (2019 Nov 20)
- Replies: 41
- Views: 9582
Re: APOD: Arp 273: Battling Galaxies from Hubble (2019 Nov 20)
It's pretty simple. For reasons unknown, presumably aesthetic, the image processor chose to rotate the entire Hubble frame from the original orientation. That resulted in dead space in all four corners where there was no image data. So rather than leaving those areas blank (which would have been th...
- Thu Nov 21, 2019 3:00 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Arp 273: Battling Galaxies from Hubble (2019 Nov 20)
- Replies: 41
- Views: 9582
Re: APOD: Arp 273: Battling Galaxies from Hubble (2019 Nov 20)
Nobody addressed the comment in one of the first posts here about repeated background elements. I see many of them, like a pair of faint edge-on galaxies near a bright orange point that appear in the top left, top right, and bottom just right of center. Are they lensed background galaxies (I’m sure...
- Wed Aug 28, 2019 5:52 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Messier 61 Close Up (2019 Aug 28)
- Replies: 18
- Views: 9642
Re: APOD: Messier 61 Close Up (2019 Aug 28)
To my eye, that core region looks abnormally small - is that an effect of the wavelength, or is the core just unusually compact?
- Thu Apr 04, 2019 11:39 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: The Gaia Stars of M15 (2019 Mar 28)
- Replies: 25
- Views: 16463
Re: APOD: The Gaia Stars of M15 (2019 Mar 28)
Actually, the GIF wouldn't need to be that much larger, really. Remember that most of the image data is identical between frames. So the only areas that need to vary between frames would be the variables - which are a very small segment of the image. Using difference overlaying, and limiting the are...
- Fri Feb 01, 2019 3:12 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Twin Galaxies in Virgo (2019 Feb 01)
- Replies: 23
- Views: 11392
Re: APOD: Twin Galaxies in Virgo (2019 Feb 01)
One of the things I love about the really large pictures APOD posts is that you can often find interesting things in the background. For example - at about pixel 75,750, there's a sharp point of light surrounded by lots of fuzziness. It doesn't exactly look like the normal elliptical/spherical galax...
- Thu Feb 25, 2016 8:34 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Highest, Tallest, and Closest to the... (2016 Feb 25)
- Replies: 26
- Views: 15894
Re: APOD: Highest, Tallest, and Closest to the... (2016 Feb 25)
Now, the question I have is - due to centrifugal force on the *atmosphere*, and the variations in local gravitation affecting the density profile of the atmosphere - is this peak actually the best one to peek through, as in the least atmosphere in the way? (And of course, light pollution is always a...
- Fri Sep 18, 2015 4:40 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Plutonian Landscape (2015 Sep 18)
- Replies: 44
- Views: 5839
Re: APOD: A Plutonian Landscape (2015 Sep 18)
Can I presume the semi-circular streaks more or less parallel to the horizon are star trails? Or is the atmosphere of Pluto *VASTLY* more complicated than we ever imagined?
- Sun Aug 17, 2014 5:08 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: No X-rays from SN 2014J (2014 Aug 16)
- Replies: 20
- Views: 28883
Re: APOD: No X-rays from SN 2014J (2014 Aug 16)
My understanding was that all three arose from General Relativity, and were essentially the same underlying phenomena appearing in different manners. I'm just surprised quantum theory doesn't throw in its own red shift source. (Or does it? Do photons lose energy through interactions with the backgr...
- Sun Aug 17, 2014 12:47 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: No X-rays from SN 2014J (2014 Aug 16)
- Replies: 20
- Views: 28883
Re: APOD: No X-rays from SN 2014J (2014 Aug 16)
I have not heard red-shift explained this way before. It does not sound at all like the explanations I have heard before, namely that we see red-shift because (at the time of emission), the light source was moving relative to the velocity we have (when receiving the light wave). Their are different...
- Sat Aug 16, 2014 8:35 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: No X-rays from SN 2014J (2014 Aug 16)
- Replies: 20
- Views: 28883
Re: APOD: No X-rays from SN 2014J (2014 Aug 16)
Here's the thing - there's *ALMOST* nothing there, but ... not quite. Look at the "before" inset. There's a somewhat diffuse glow, strongest on the left, with something of a waist before it brightens back up just a bit (mostly reddish). There's also a somewhat more compact source in the u...
- Sat Aug 16, 2014 5:39 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: No X-rays from SN 2014J (2014 Aug 16)
- Replies: 20
- Views: 28883
Re: APOD: No X-rays from SN 2014J (2014 Aug 16)
Here's the thing - there's *ALMOST* nothing there, but ... not quite. Look at the "before" inset. There's a somewhat diffuse glow, strongest on the left, with something of a waist before it brightens back up just a bit (mostly reddish). There's also a somewhat more compact source in the up...
- Fri Apr 04, 2014 4:41 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Along the Western Veil (2014 Apr 04)
- Replies: 18
- Views: 8968
Re: APOD: Along the Western Veil (2014 Apr 04)
Just be careful about looking at this with R/B anaglyph glasses. Freaky!
- Wed Nov 20, 2013 10:37 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Heavy Black Hole Jets in 4U1630 47 (2013 Nov 20)
- Replies: 58
- Views: 13887
Re: APOD: Heavy Black Hole Jets in 4U1630 47 (2013 Nov 20)
Unless this star is very unusual, it is going to contain heavy metals, up to and including iron - and probably even a bit beyond. Iron contained in the star material gets drawn off into the accretion disk, spirals in and gets ejected in the disk... Who honestly *DIDN'T* expect to see iron & nic...
- Wed Nov 20, 2013 4:07 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Heavy Black Hole Jets in 4U1630 47 (2013 Nov 20)
- Replies: 58
- Views: 13887
Re: APOD: Heavy Black Hole Jets in 4U1630 47 (2013 Nov 20)
Unless this star is very unusual, it is going to contain heavy metals, up to and including iron - and probably even a bit beyond. Iron contained in the star material gets drawn off into the accretion disk, spirals in and gets ejected in the disk... Who honestly *DIDN'T* expect to see iron & nick...
- Mon Aug 26, 2013 2:08 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Bright Planetary Nebula NGC 7027... (2013 Aug 26)
- Replies: 1200
- Views: 203662
Re: APOD: Bright Planetary Nebula NGC 7027... (2013 Aug 26)
The Travolta Nebula (Stayin' Alive!!!)
- Sun Aug 18, 2013 4:08 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Skylab Over Earth (2013 Aug 18)
- Replies: 24
- Views: 6757
Re: APOD: Skylab Over Earth (2013 Aug 18)
*vaguely wonders why this discussion on alignment marks didn't take place in a separate thread over where the camera nuts hide* It's kind of sad, really, that we never launched Skylab B. Or a Skylab C. Three of them would give us as much pressurized volume as the ISS currently has. And since they'd ...
- Sat Jun 01, 2013 5:09 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: One Armed Spiral Galaxy NGC 4725 (2013 May 30)
- Replies: 40
- Views: 9804
Re: APOD: One Armed Spiral Galaxy NGC 4725 (2013 May 30)
Eddies can appear in fluid dynamics but not, I think, when the dynamism of a system is driven by gravity. ... Except that aren't planets supposed to collapse from eddies in the dust clouds around the stars? Sure, there's some magnetic effects in play, but the primary force in the protoplanetary dis...
- Fri May 31, 2013 1:21 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: One Armed Spiral Galaxy NGC 4725 (2013 May 30)
- Replies: 40
- Views: 9804
Re: APOD: One Armed Spiral Galaxy NGC 4725 (2013 May 30)
Eddies can appear in fluid dynamics but not, I think, when the dynamism of a system is driven by gravity. Any seeming eddy in an image of a galaxy will either be a background galaxy or a much smaller colliding galaxy, as in the image you linked to Ann. In that case I don't think eddy is quite the r...
- Fri May 31, 2013 4:02 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: One Armed Spiral Galaxy NGC 4725 (2013 May 30)
- Replies: 40
- Views: 9804
Re: APOD: One Armed Spiral Galaxy NGC 4725 (2013 May 30)
One thing I find interested in a little knot in the arm of the galaxy, at about the 5:30 position. I can't quite tell if it's a small region of sub-rotation, or another galaxy in the background. Be kind of neat, though, to actually find a galaxy with a notable eddy spiral in one of its arms.
- Mon Oct 29, 2012 12:23 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Phobos: Doomed Moon of Mars (2012 Oct 28)
- Replies: 44
- Views: 14544
Re: APOD: Phobos: Doomed Moon of Mars (2012 Oct 28)
So very very true.rstevenson wrote:It's possible to see a lot given just a few pixels. Or rather, it's possible to imagine a lot given just a few pixels.
Rob
- Mon Oct 29, 2012 12:22 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Phobos: Doomed Moon of Mars (2012 Oct 28)
- Replies: 44
- Views: 14544
Re: APOD: Phobos: Doomed Moon of Mars (2012 Oct 28)
They're pixels, yes - and my image editor (Gimp in this case) has a scale along the sides, and a "cursor position information window" that gives me the location.BDanielMayfield wrote:I'm trying to find what ya'll are discussing, but were are the numbers (pixel coordinates?) you're using?
Bruce