Search found 3007 matches
- Wed Apr 17, 2024 4:50 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: The Cigar Galaxy from Hubble and Webb (2024 Apr 15)
- Replies: 26
- Views: 2766
Re: APOD: The Cigar Galaxy from Hubble and Webb (2024 Apr 15)
Dust is produced during "violence processes" in space. Star formation creates dust. High-mass stars create dust even during their main sequence life time, if there is gas in the vicinity. High-mass stars create a lot of dust during their gianthood period. Supernovas create a large amount ...
- Tue Apr 16, 2024 9:30 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: The Cigar Galaxy from Hubble and Webb (2024 Apr 15)
- Replies: 26
- Views: 2766
Re: APOD: The Cigar Galaxy from Hubble and Webb (2024 Apr 15)
Plasma is just highly ionized gas. That is, a mix of neutral atoms, ions, and electrons. It can't exist in "chunks". Space is full of plasma regions (like all those glowing emission nebulas we see here). That's all well and good, but why is this particular red dust "unexpected"?...
- Tue Apr 16, 2024 6:31 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: The Cigar Galaxy from Hubble and Webb (2024 Apr 15)
- Replies: 26
- Views: 2766
Re: APOD: The Cigar Galaxy from Hubble and Webb (2024 Apr 15)
"shows, unexpectedly, that this red-glowing dust is associated with hot plasma." Is it unexpected because there is plasma inside stars, but this is plasma dust in between stars, as if chunks of plasma were blown out of stars? Plasma is just highly ionized gas. That is, a mix of neutral at...
- Mon Apr 15, 2024 9:14 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: The Cigar Galaxy from Hubble and Webb (2024 Apr 15)
- Replies: 26
- Views: 2766
Re: APOD: The Cigar Galaxy from Hubble and Webb (2024 Apr 15)
The Hubble image shows M82 in its entirety (well, mostly), whereas the JWST image only shows the center of M82. All the bright white dots in the JWST image are star clusters, and the fainter dots are most likely individual stars. (Well, admittedly, there is a lonely-looking elongated white thing be...
- Mon Apr 15, 2024 7:08 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: The Cigar Galaxy from Hubble and Webb (2024 Apr 15)
- Replies: 26
- Views: 2766
Re: APOD: The Cigar Galaxy from Hubble and Webb (2024 Apr 15)
The Hubble image shows M82 in its entirety (well, mostly), whereas the JWST image only shows the center of M82. All the bright white dots in the JWST image are star clusters, and the fainter dots are most likely individual stars. (Well, admittedly, there is a lonely-looking elongated white thing be...
- Mon Apr 15, 2024 3:42 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: How a Total Solar Eclipse Ended (2024 Apr 14)
- Replies: 12
- Views: 1487
Re: APOD: How a Total Solar Eclipse Ended (2024 Apr 14)
I think it's akin to seeing photographs of the Grand Canyon and being there. The pictures are nice, the anecdotal accounts are impressive, but man oh man you don't get the immensity until you've been there. But the Grand Canyon is HUGE! Compared to a 0.5* wide Sun-Moon combo in the sky, I still can...
- Sun Apr 14, 2024 9:06 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: How a Total Solar Eclipse Ended (2024 Apr 14)
- Replies: 12
- Views: 1487
Re: APOD: How a Total Solar Eclipse Ended (2024 Apr 14)
I had seen several partials but never a total eclipse. I brought cameras along but after about 20 seconds I decided that I wasn't going to live this experience through the lens. There are countless other photographers more able than I to document this. I needed to see this in person and more import...
- Sun Apr 14, 2024 6:59 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: How a Total Solar Eclipse Ended (2024 Apr 14)
- Replies: 12
- Views: 1487
Re: APOD: How a Total Solar Eclipse Ended (2024 Apr 14)
I had seen several partials but never a total eclipse. I brought cameras along but after about 20 seconds I decided that I wasn't going to live this experience through the lens. There are countless other photographers more able than I to document this. I needed to see this in person and more import...
- Sun Apr 14, 2024 3:08 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: How a Total Solar Eclipse Ended (2024 Apr 14)
- Replies: 12
- Views: 1487
Re: APOD: How a Total Solar Eclipse Ended (2024 Apr 14)
How does a total solar eclipse end? " This is the way a total eclipse ends Not with a whimper, but a FLASH-bang !" —— (with apologies to T. S. Eliot) From The Hollow Men" ( T. S. Eliot - 1925 ) This is the way the world ends This is the way the world ends This is the way the world en...
- Sat Apr 13, 2024 9:39 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Palm Tree Partial Eclipse (2024 Apr 13)
- Replies: 11
- Views: 1310
Re: APOD: Palm Tree Partial Eclipse (2024 Apr 13)
One of the links mentions that the length of totality varies - significantly - at different locations. Why is this? Complex orbital motions or something simpler? In April, totality will last longer than it did in 2017. Seven years ago, the longest period of totality was experienced near Carbondale,...
- Sat Apr 13, 2024 6:54 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Palm Tree Partial Eclipse (2024 Apr 13)
- Replies: 11
- Views: 1310
Re: APOD: Palm Tree Partial Eclipse (2024 Apr 13)
PNG is good for graphics and text images, because it is usually written in a lossless format (but it doesn't have to be... lossy PNG creates much smaller files, more similar to JPEG). So for screen captures, PNG is usually a better format unless you actively require a small file and can accommodate...
- Sat Apr 13, 2024 6:17 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Palm Tree Partial Eclipse (2024 Apr 13)
- Replies: 11
- Views: 1310
Re: APOD: Palm Tree Partial Eclipse (2024 Apr 13)
Hello! Today's APOD image is considerably larger in file size than it needs to be, as it's been saved using the PNG format. It should likely be using JPEG instead. I am referring to the image at this path: https://apod.nasa.gov/apod/image/2404/pinholepalm1024.png I have confirmed I can download the...
- Sat Apr 13, 2024 4:00 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Palm Tree Partial Eclipse (2024 Apr 13)
- Replies: 11
- Views: 1310
Re: APOD: Palm Tree Partial Eclipse (2024 Apr 13)
One of the links mentions that the length of totality varies - significantly - at different locations. Why is this? Complex orbital motions or something simpler? In April, totality will last longer than it did in 2017. Seven years ago, the longest period of totality was experienced near Carbondale, ...
- Sat Apr 13, 2024 3:59 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Palm Tree Partial Eclipse (2024 Apr 13)
- Replies: 11
- Views: 1310
Re: APOD: Palm Tree Partial Eclipse (2024 Apr 13)
Hello! Today's APOD image is considerably larger in file size than it needs to be, as it's been saved using the PNG format. It should likely be using JPEG instead. I am referring to the image at this path: https://apod.nasa.gov/apod/image/2404/pinholepalm1024.png I have confirmed I can download the...
- Fri Apr 12, 2024 9:27 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Total Totality (2024 Apr 12)
- Replies: 22
- Views: 1738
Re: APOD: Total Totality (2024 Apr 12)
There are 7 frames here, so that's 3 minutes. Totality at my location (near Evening Shade, Arkansas, 100 meters from the centerline) was 4:13. But totality had already started when I switched to the fast bracketed shots, so the first of it is missed here. The Moon was moving east, so lower right to...
- Fri Apr 12, 2024 7:31 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Total Totality (2024 Apr 12)
- Replies: 22
- Views: 1738
Re: APOD: Total Totality (2024 Apr 12)
This is kind of fun, an animated version of what we see in today's APOD. Frames are 30 seconds apart. (Might have to click on it to see the animation... depends on your browser.) _ prom_stack.gif Very nice. So, that would mean that the total time represented in the APOD is about 4.5 minutes, which ...
- Fri Apr 12, 2024 6:41 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Total Totality (2024 Apr 12)
- Replies: 22
- Views: 1738
Re: APOD: Total Totality (2024 Apr 12)
This is kind of fun, an animated version of what we see in today's APOD. Frames are 30 seconds apart. (Might have to click on it to see the animation... depends on your browser.) _ prom_stack.gif Very nice. So, that would mean that the total time represented in the APOD is about 4.5 minutes, which ...
- Thu Apr 11, 2024 5:45 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Eclipse in Seven (2024 Apr 11)
- Replies: 7
- Views: 1090
Re: APOD: Eclipse in Seven (2024 Apr 11)
What's the time separation of the photos here: 30 - 40 seconds or so? Also, there's the slightest hint of a pink prominence at 6 o'clock. Why can't we see more of it? I'd say 20 minutes between each image. The prominences are washed out by the corona close to the Sun. To capture both them and the c...
- Thu Apr 11, 2024 4:59 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Planets Around a Total Eclipse (2024 Apr 10)
- Replies: 12
- Views: 1360
Re: APOD: Planets Around a Total Eclipse (2024 Apr 10)
I disagree. I've seen a number of eclipses, and while images can't capture the overall ambience and awe that go with that experience, they blow away the human eye and brain for capturing detail and dynamic range. A good camera, good optics, and good processing far, far exceed what our senses are ca...
- Thu Apr 11, 2024 4:58 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Moon's Shadow over Lake Magog (2024 Apr 09)
- Replies: 13
- Views: 1623
Re: APOD: Moon's Shadow over Lake Magog (2024 Apr 09)
Lake Magog, Quebec The picture was actually taken in the town of Magog, QC, on the shore of Lake Memphemagog. Lake Magog is another lake slightly east of Magog. This was Stan's mistake. He acknowledged my correction below my comment of this picture on his Instragram page. Thanks for the correction....
- Thu Apr 11, 2024 4:32 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Eclipse in Seven (2024 Apr 11)
- Replies: 7
- Views: 1090
Re: APOD: Eclipse in Seven (2024 Apr 11)
What's the time separation of the photos here: 30 - 40 seconds or so? Also, there's the slightest hint of a pink prominence at 6 o'clock. Why can't we see more of it?
- Thu Apr 11, 2024 4:19 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Planets Around a Total Eclipse (2024 Apr 10)
- Replies: 12
- Views: 1360
Re: APOD: Planets Around a Total Eclipse (2024 Apr 10)
This conversation about digital processing and imagery differences shrinking or enlarging high contrast components of an image brings to mind my experience of the eclipse only a few miles away from where this photo was taken. The eye, occipital lobe visual processing part of the brain and other pro...
- Wed Apr 10, 2024 4:00 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Total Solar Eclipse over Wyoming (2024 Apr 07)
- Replies: 11
- Views: 1462
Re: APOD: A Total Solar Eclipse over Wyoming (2024 Apr 07)
I made a pinhole camera for the 1963 partial eclipse, and while it was a once-removed viewing, it was still fun. But, my friend and I also decided on something else concurrently (and against my father's orders): we held a candle up to a broken piece of glass, and for so long that it became too blac...
- Wed Apr 10, 2024 3:57 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Total Solar Eclipse over Wyoming (2024 Apr 07)
- Replies: 11
- Views: 1462
Re: APOD: A Total Solar Eclipse over Wyoming (2024 Apr 07)
I made a pinhole camera for the 1963 partial eclipse, and while it was a once-removed viewing, it was still fun. But, my friend and I also decided on something else concurrently (and against my father's orders): we held a candle up to a broken piece of glass, and for so long that it became too blac...
- Wed Apr 10, 2024 2:03 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: CMB Dipole: Speeding Through the... (2022 Apr 03)
- Replies: 64
- Views: 30032
Re: APOD: CMB Dipole: Speeding Through the... (2022 Apr 03)
Consensus is one of the most important parts of the scientific method. It means nearly all cosmologists agree on the general origin of the CMB. Which means nearly everyone else should agree, as well. Because experts are experts, and most others are not. If you're not an expert, you're not qualified...