Search found 2877 matches
- Thu May 02, 2024 9:09 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: M100: A Grand Design Spiral Galaxy (2024 May 02)
- Replies: 19
- Views: 377
Re: APOD: M100: A Grand Design Spiral Galaxy (2024 May 02)
Let's look at a truly barred galaxy, M61: Wikipedia thinks M61 is an intermediate barred spiral: Messier 61 (also known as M61, NGC 4303, or the Swelling Spiral Galaxy) is an intermediate barred spiral galaxy in the Virgo Cluster of galaxies. It was first discovered by Barnaba Oriani on May 5, 1779...
- Thu May 02, 2024 4:39 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: M100: A Grand Design Spiral Galaxy (2024 May 02)
- Replies: 19
- Views: 377
Re: APOD: M100: A Grand Design Spiral Galaxy (2024 May 02)
Sadly, this "One of the brightest members of the Virgo Cluster of galaxies, M100, also known as NGC 4321" is not even shown at the Virgo Cluster APOD link:
- Thu May 02, 2024 3:10 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: IC 1795: The Fishhead Nebula (2024 May 01)
- Replies: 23
- Views: 480
Re: APOD: IC 1795: The Fishhead Nebula (2024 May 01)
Well, yes... not really an option with most astronomical objects, though! Angular sizes are usually only given when they are interesting in their own right for some reason (like if an object is the apparent size of the Moon). But they are always easily determined in any image with more than a handf...
- Thu May 02, 2024 1:26 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: M100: A Grand Design Spiral Galaxy (2024 May 02)
- Replies: 19
- Views: 377
Re: APOD: M100: A Grand Design Spiral Galaxy (2024 May 02)
Thank you very much. Extremely honored again. 🙏🏼 I am blessed with Bortle 2 skies in Northern Arizona. -Drew https://www.astrobin.com/users/DrewJEvans/ https://NAZObservatory.com Excellent work! Can I ask how many hours did you spend creating this picture in total? The link to the author's Astrobin...
- Thu May 02, 2024 1:15 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: IC 1795: The Fishhead Nebula (2024 May 01)
- Replies: 23
- Views: 480
Re: APOD: IC 1795: The Fishhead Nebula (2024 May 01)
But in order to determine that the snowman is 2 meters high, we need to know our distance from it and the angle it subtends at that distance. Likewise for the nebula. ... I was declaring the Snowman's height, not estimating. Well, yes... not really an option with most astronomical objects, though! ...
- Wed May 01, 2024 5:44 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: IC 1795: The Fishhead Nebula (2024 May 01)
- Replies: 23
- Views: 480
Re: APOD: IC 1795: The Fishhead Nebula (2024 May 01)
Just wanted to note that there are two possible right angle triangles that could be used to determine the distance and angle, but at the large distances typically involved, they are almost the same. I had always assumed that we were using the smaller ɑ angle, but it's really the slightly larger angl...
- Wed May 01, 2024 4:59 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: IC 1795: The Fishhead Nebula (2024 May 01)
- Replies: 23
- Views: 480
Re: APOD: IC 1795: The Fishhead Nebula (2024 May 01)
In context from a wider field of view image at one of the links in the text:
- Tue Apr 30, 2024 9:31 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: GK Per: Nova and Planetary Nebula (2024 Apr 30)
- Replies: 14
- Views: 630
Re: APOD: GK Per: Nova and Planetary Nebula (2024 Apr 30)
Not so with supernovas. And it's fascinating to think that supernovas type Ia form in much the same way as cataclysmic novas like GK Per. The difference is that so much matter builds up on the white dwarf's surface that the white dwarf reaches its Chandrasekhar limit, the maximum mass of a white dw...
- Tue Apr 30, 2024 6:31 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: GK Per: Nova and Planetary Nebula (2024 Apr 30)
- Replies: 14
- Views: 630
Re: APOD: GK Per: Nova and Planetary Nebula (2024 Apr 30)
Sort of. Here's a succession of images taken over the years that demonstrate the growth: https://vimeo.com/31120259mason dixon wrote: ↑Tue Apr 30, 2024 6:19 pm Is there a timelapse of the Firework nebula growing in size like the Crab nebula?
- Tue Apr 30, 2024 1:09 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: GK Per: Nova and Planetary Nebula (2024 Apr 30)
- Replies: 14
- Views: 630
Re: APOD: GK Per: Nova and Planetary Nebula (2024 Apr 30)
Not so with supernovas. And it's fascinating to think that supernovas type Ia form in much the same way as cataclysmic novas like GK Per. The difference is that so much matter builds up on the white dwarf's surface that the white dwarf reaches its Chandrasekhar limit, the maximum mass of a white dw...
- Mon Apr 29, 2024 10:35 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Rings Around the Ring Nebula (2024 Apr 28)
- Replies: 15
- Views: 542
Re: APOD: Rings Around the Ring Nebula (2024 Apr 28)
Ok, agreed. The Sun would be merely senescent, but not yet entirely dead! 😊 Maybe these stars are quite comfortable in anticipation; a ripening chrysalis perhaps. The ripening is only beginning, give them a quadrillion years and white dwarfs apparently turn into giant diamonds! Which of course are ...
- Mon Apr 29, 2024 9:35 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: All Sky Moon Shadow (2024 Apr 27)
- Replies: 15
- Views: 455
Re: APOD: All Sky Moon Shadow (2024 Apr 27)
Very hard to tell.Rauf wrote: ↑Mon Apr 29, 2024 7:26 pmI wonder if that flag is lying on the ground or is it standing.
- Mon Apr 29, 2024 5:05 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Comet, Planet, Moon (2024 Apr 29)
- Replies: 4
- Views: 287
Re: APOD: Comet, Planet, Moon (2024 Apr 29)
Ok, where is this "stubby" dust tail on the right? If it really is visible here, I find it difficult to distinguish it from the impressive vertical ion tail!
- Mon Apr 29, 2024 3:12 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: All Sky Moon Shadow (2024 Apr 27)
- Replies: 15
- Views: 455
Re: APOD: All Sky Moon Shadow (2024 Apr 27)
Thanks. Indeed it must be. I didn't even notice it!Rauf wrote: ↑Mon Apr 29, 2024 5:24 am20240408h14crop.jpgjohnnydeep wrote: ↑Sun Apr 28, 2024 1:18 pmWhere is this Turkish flag you’re referring to?wilddouglascounty wrote: ↑Sun Apr 28, 2024 2:36 am
So is he from Turkey? That's the Turkey flag, right?
I think this is the Turkish flag they are referring to.
- Mon Apr 29, 2024 3:08 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Regulus and the Dwarf Galaxy (2024 Apr 26)
- Replies: 18
- Views: 758
Re: APOD: Regulus and the Dwarf Galaxy (2024 Apr 26)
The HR diagram of the Milky Way..jpgThe HR diagram of the Milky Way-.jpg https://asterisk.apod.com/download/file.php?id=49545&mode=view Cool! Nice work. Well I am not sure. Maybe fitting the temperature scales is better The HR diagram of the Milky Way-3.jpgThe HR diagram of the Milky Way-4.jpg ...
- Sun Apr 28, 2024 6:45 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Regulus and the Dwarf Galaxy (2024 Apr 26)
- Replies: 18
- Views: 758
Re: APOD: Regulus and the Dwarf Galaxy (2024 Apr 26)
... Galaxies and globular clusters contain different types of stars. Ann Exactly. Which reasonably suggests that they have entirely different formation processes. The HR diagram of the Milky Way..jpgThe HR diagram of the Milky Way-.jpg https://asterisk.apod.com/download/file.php?id=49545&mode=v...
- Sun Apr 28, 2024 4:14 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Rings Around the Ring Nebula (2024 Apr 28)
- Replies: 15
- Views: 542
Re: APOD: Rings Around the Ring Nebula (2024 Apr 28)
So, something similar will likely be the fate of our own Sun, correct? From the link - Planetary Nebulae Planetary nebulae (PN) represent the last stages of evolution for low- and intermediate-mass stars whose Main Sequence mass was less than about 8 solar masses. After evolving through the Asympto...
- Sun Apr 28, 2024 4:07 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Rings Around the Ring Nebula (2024 Apr 28)
- Replies: 15
- Views: 542
Re: APOD: Rings Around the Ring Nebula (2024 Apr 28)
So, something similar will likely be the fate of our own Sun, correct? From the link - Planetary Nebulae Planetary nebulae (PN) represent the last stages of evolution for low- and intermediate-mass stars whose Main Sequence mass was less than about 8 solar masses. After evolving through the Asymptot...
- Sun Apr 28, 2024 1:18 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: All Sky Moon Shadow (2024 Apr 27)
- Replies: 15
- Views: 455
Re: APOD: All Sky Moon Shadow (2024 Apr 27)
Probably not near center, but Cassiopeia should be in the picture. I definitely couldn't spot the familiar W. Ann Cassiopeia is in the picture. Look at the annotated version mentioned in the explanation. The image is a another masterpiece by Tunç Tezel. APOD should be able to spell his name correct...
- Sat Apr 27, 2024 8:49 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: All Sky Moon Shadow (2024 Apr 27)
- Replies: 15
- Views: 455
Re: APOD: All Sky Moon Shadow (2024 Apr 27)
This image really showcases just how tiny this phenomenon really looks to the unaided eye. Still, though, it's a great image! Actually, to the unaided eye, it looks much larger. What this picture illustrates is just how small it actually is, despite the powerful illusion of it appearing much larger...
- Sat Apr 27, 2024 6:04 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: All Sky Moon Shadow (2024 Apr 27)
- Replies: 15
- Views: 455
Re: APOD: All Sky Moon Shadow (2024 Apr 27)
This image really showcases just how tiny this phenomenon really looks to the unaided eye. Still, though, it's a great image!
- Wed Apr 24, 2024 12:59 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Dragon's Egg Bipolar Emission... (2024 Apr 24)
- Replies: 3
- Views: 620
Re: APOD: Dragon's Egg Bipolar Emission... (2024 Apr 24)
Always nice to see a reference to the book Dragon's Egg by Robert L. Forward, but the O-type stellar "egg" here is not the same type of egg as the titular star of the book, which is a neutron star. Though HD 148937 may well become a neutron star in a few million years as the end product of...
- Tue Apr 23, 2024 6:15 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Contrail Shadow X (2024 Apr 23)
- Replies: 20
- Views: 610
Re: APOD: Contrail Shadow X (2024 Apr 23)
Interesting discussion on an APOD I was expecting to see none on! And I took the text at it's word, but it's now (pretty) clear to me that the shadow is cast downward, not up. Thanks!
- Tue Apr 23, 2024 6:01 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Contrail Shadow X (2024 Apr 23)
- Replies: 20
- Views: 610
Re: APOD: Contrail Shadow X (2024 Apr 23)
Nice. A prefect match. I guessed you must mean the flag, and I was right:
- The flag of Scotland (Scottish Gaelic: bratach na h-Alba;[1] Scots: Banner o Scotland, also known as St Andrew's Cross or the Saltire)[2] is the national flag of Scotland, which consists of a white saltire defacing a blue field. The Saltire, rather than the Royal Standard of Scotland, is the correct flag for all private individuals and corporate bodies to fly.[3] It is also, where possible, flown from Scottish Government buildings every day from 8:00 am until sunset, with certain exceptions.[4]
- Tue Apr 23, 2024 1:33 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Diamonds in the Sky (2024 Apr 20)
- Replies: 13
- Views: 582
Re: APOD: Diamonds in the Sky (2024 Apr 20)
It seems the link that is supposed to direct to yesterday's APOD instead redirects to the APOD for April 18. That's usually remedied by refreshing (reloading) your browser page. Doing that almost always fixes any stale link issues that I sometimes see. Not working. I don't think it's on my end. zxc...