Search found 17426 matches
- Wed May 15, 2024 3:27 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: AR 3664 at the Sun's Edge (2024 May 15)
- Replies: 4
- Views: 314
Re: APOD: AR 3664 at the Sun's Edge (2024 May 15)
Astonishing !! :shock: !! From my non-astronomer/non-scientist point of view, I must presume (given the clarity of today's APOD) that the almost infinite orders of magnitude greater cost for other platforms must in some manner provide significantly greater information. I *hope* so. An image like th...
- Wed May 15, 2024 1:20 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: AR 3664 at the Sun's Edge (2024 May 15)
- Replies: 4
- Views: 314
Re: APOD: AR 3664 at the Sun's Edge (2024 May 15)
Amazing photograph! How was this taken? Was it from a space platform, an observatory, or from a portable ground based telescope? This latter seems quite improbable; however, I did follow the link to the photographer's website (where could not find this image) and his other images do seem to be made...
- Tue May 14, 2024 6:59 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Colors of Twilight vs. Sunset/Sunrise
- Replies: 34
- Views: 2590
Re: Colors of Twilight vs. Sunset/Sunrise
The Belt of Venus illustrates this. The upper pink part is directly lit by the Sun. The lower blue part is only scattering light from other parts of the sky. Regarding the lower blue part, which is the Earth's shadow, I wonder if the blue color is not a function of Rayleigh scattering but instead C...
- Tue May 14, 2024 6:41 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: The 37 Cluster (2024 May 14)
- Replies: 24
- Views: 477
Re: APOD: The 37 Cluster (2024 May 14)
The link to the "webda" page mentioned (https://webda.physics.muni.cz/cgi-bin/ocl_page.cgi?dirname=ngc2169) shows a "Log age" of 7.067 and 10 the power of that is about 11,668,096.17 😊 That's because you have a cheap calculator. Mine has more digits, so I know the age of this cl...
- Tue May 14, 2024 6:34 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: The 37 Cluster (2024 May 14)
- Replies: 24
- Views: 477
Re: APOD: The 37 Cluster (2024 May 14)
Log Age What about it? The link to the "webda" page mentioned (https://webda.physics.muni.cz/cgi-bin/ocl_page.cgi?dirname=ngc2169) shows a "Log age" of 7.067 and 10 the power of that is about 11,668,096.17 😊 That's because you have a cheap calculator. Mine has more digits, so I ...
- Tue May 14, 2024 6:33 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: The 37 Cluster (2024 May 14)
- Replies: 24
- Views: 477
Re: APOD: The 37 Cluster (2024 May 14)
LOG Age = 7.067 means 10^^7.067, which on my Casio shows 11,668,096. No, it means "about 11 million years". Or maybe, "about 11.5 million years". All but the first few digits are insignificant, and when you write them out it results in a misleading number, that might fool somebo...
- Tue May 14, 2024 6:10 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: The 37 Cluster (2024 May 14)
- Replies: 24
- Views: 477
Re: APOD: The 37 Cluster (2024 May 14)
What about it?Roy wrote: ↑Tue May 14, 2024 6:09 pmLog Age
- Tue May 14, 2024 6:07 pm
- Forum: The Library: Information Desk and Educational Resources
- Topic: Why are earthly sunsets never green?
- Replies: 24
- Views: 16620
Re: Why are earthly sunsets never green?
The color green does not exist outside our human eyes and brains. It is our eyes and brains that "create" the color green. Also then should be the case regarding the sun's green flash, it is an optical phenomenon, as our eyes and brains also create the color green of the sun's green flash...
- Tue May 14, 2024 6:00 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Colors of Twilight vs. Sunset/Sunrise
- Replies: 34
- Views: 2590
Re: Colors of Twilight vs. Sunset/Sunrise
I wonder if this Wikipedia article on Sky brightness makes sense -- it seems to that there is both direct and indirect sunlight in the sky at twilight -- "Indirectly scattered sunlight comes from ... the atmosphere itself .... the Sun has just set but still illuminates the upper atmosphere dir...
- Tue May 14, 2024 5:57 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: AR 3664 on a Setting Sun (2024 May 13)
- Replies: 17
- Views: 557
Re: APOD: AR 3664 on a Setting Sun (2024 May 13)
Hopefully someone can clear up some sun confusions for me. Today's APOD shows AR-3664 towards the BOTTOM of the solar disk. That of May 11 showed this cluster to be towards the RIGHT. Does the apparent orientation of the sun shift from day to day? My understanding is that the storms move from left ...
- Tue May 14, 2024 3:18 pm
- Forum: The Library: Information Desk and Educational Resources
- Topic: Why are earthly sunsets never green?
- Replies: 24
- Views: 16620
Re: Why are earthly sunsets never green?
The color green does not exist outside our human eyes and brains. It is our eyes and brains that "create" the color green. Also then should be the case regarding the sun's green flash, it is an optical phenomenon, as our eyes and brains also create the color green of the sun's green flash...
- Tue May 14, 2024 3:13 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: The 37 Cluster (2024 May 14)
- Replies: 24
- Views: 477
Re: APOD: The 37 Cluster (2024 May 14)
Nowhere in the information supplied do they mention the classification or number of the stars in the cluster. Yet the age of the cluster is estimated to be only 11,668,000 years. Curiously short - and no leftover nebular material. About 30 stars. The cluster does lie inside a region of faint nebulo...
- Tue May 14, 2024 1:59 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: The 37 Cluster (2024 May 14)
- Replies: 24
- Views: 477
Re: APOD: The 37 Cluster (2024 May 14)
The write-up mentioned that our Sun may have been part of a cluster at one time. Do we know where our sun was born? Was that theoretical cluster here, or did the Sun migrate to here from 'parts unknown'? Do astronomers have any theories of as to where our cluster was? The cluster that the Sun forme...
- Tue May 14, 2024 1:25 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: The 37 Cluster (2024 May 14)
- Replies: 24
- Views: 477
Re: APOD: The 37 Cluster (2024 May 14)
Nowhere in the information supplied do they mention the classification or number of the stars in the cluster. Yet the age of the cluster is estimated to be only 11,668,000 years. Curiously short - and no leftover nebular material. About 30 stars. The cluster does lie inside a region of faint nebulo...
- Mon May 13, 2024 10:09 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: AR 3664 on a Setting Sun (2024 May 13)
- Replies: 17
- Views: 557
Re: APOD: AR 3664 on a Setting Sun (2024 May 13)
Hopefully someone can clear up some sun confusions for me. Today's APOD shows AR-3664 towards the BOTTOM of the solar disk. That of May 11 showed this cluster to be towards the RIGHT. Does the apparent orientation of the sun shift from day to day? My understanding is that the storms move from left ...
- Mon May 13, 2024 7:34 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: AR 3664 on a Setting Sun (2024 May 13)
- Replies: 17
- Views: 557
Re: APOD: AR 3664 on a Setting Sun (2024 May 13)
We are getting alot of photoshopped pictures . What do I mean? In this case, a picture of the sunspots superimposed on the sun in a photo in which the sun would be too bright to look at, to cause an artistic view. Photo or portrait? It's an HDR image, composited from several different exposure time...
- Mon May 13, 2024 1:44 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: AR 3664 on a Setting Sun (2024 May 13)
- Replies: 17
- Views: 557
- Mon May 13, 2024 4:42 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: What did you see in the sky tonight?
- Replies: 1303
- Views: 1060133
Re: What did you see in the sky tonight?
Last night I tried to photograph the aurora with my DSLR with little success. My wife took these with her IPhone. image_123650291 (1)a.JPG image_123650291 (2)a.JPG image_123650291a.JPG With my eye it was not very apparent but her cell phone captured quite a different scene. :? Is aurora photography...
- Sun May 12, 2024 4:27 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Red Aurora over Poland (2024 May 12)
- Replies: 13
- Views: 406
Re: APOD: Red Aurora over Poland (2024 May 12)
It works but only if the youtube url is of a specific format, namely like this: https://www.youtube.com/watch?v=1MYJhsjX-C4 And you need to use the right tags: [youtube][/youtube] The result looks like so: https://www.youtube.com/watch?v=1MYJhsjX-C4 I wonder why after I clicked Show in YouTube I wa...
- Sun May 12, 2024 1:53 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: AR 3664: Giant Sunspot Group (2024 May 11)
- Replies: 25
- Views: 926
Re: APOD: AR 3664: Giant Sunspot Group (2024 May 11)
Is this image, its quality and the gesture to publish it, a huge joke? From time to time APOD editions pop into my view, last time I left some abrasive comments was for the photoshoped solar eclipse-moon-something. I literally shoot better (read: much better, link below to our forum) images during ...
- Sun May 12, 2024 12:17 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: AR 3664: Giant Sunspot Group (2024 May 11)
- Replies: 25
- Views: 926
Re: APOD: AR 3664: Giant Sunspot Group (2024 May 11)
And where were they? Is it ever possible to link a specific sunspot group with an aurora? The four CMEs in the last days, and the new one today, all came from this group, and are responsible for the current auroral activity. Ok. Is the cause and effect indisputable? I guess so simply due to travel ...
- Sat May 11, 2024 9:34 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: AR 3664: Giant Sunspot Group (2024 May 11)
- Replies: 25
- Views: 926
Re: APOD: AR 3664: Giant Sunspot Group (2024 May 11)
Ok, where are the sunspots? 😊 Wrong question. Cause and effect. Where were the sunspots a couple of days ago? That's what mattered! And where were they? Is it ever possible to link a specific sunspot group with an aurora? The four CMEs in the last days, and the new one today, all came from this gro...
- Sat May 11, 2024 7:41 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: AR 3664: Giant Sunspot Group (2024 May 11)
- Replies: 25
- Views: 926
Re: APOD: AR 3664: Giant Sunspot Group (2024 May 11)
Pretty good here in central Colorado, 38°N, despite it being pretty cloudy. This is an allsky video from late twilight to 1:30am when it completely clouded over. https://vimeo.com/945334892 Last image below was taken pointing very high, with the Big Dipper in the frame. _ E7_48521p.jpg E7_48527p.jp...
- Sat May 11, 2024 7:33 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: AR 3664: Giant Sunspot Group (2024 May 11)
- Replies: 25
- Views: 926
Re: APOD: AR 3664: Giant Sunspot Group (2024 May 11)
Pretty good here in central Colorado, 38°N, despite it being pretty cloudy. This is an allsky video from late twilight to 1:30am when it completely clouded over. https://vimeo.com/945334892 Last image below was taken pointing very high, with the Big Dipper in the frame. _ E7_48521p.jpg E7_48527p.jpg...
- Sat May 11, 2024 6:17 pm
- Forum: Open Space: Discuss Anything
- Topic: Weather!
- Replies: 2868
- Views: 1001083
Re: Weather!
How can evolution favor an organism's death? In the big picture, no species can evolve for long if the old versions aren't eliminated. You need reproduction for adaptation and evolution, and you can't have reproduction without death in any system with limited resources. OK, let's say that hypotheti...