A wide angle image like this is strongly distorted. You can't compare what it shows to what your eye sees.
Search found 17433 matches
- Mon May 20, 2024 12:40 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Aurora Dome Sky (2024 May 20)
- Replies: 4
- Views: 307
- Sun May 19, 2024 10:13 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Jupiter Diving (2024 May 19)
- Replies: 10
- Views: 322
Re: APOD: Jupiter Diving (2024 May 19)
I just re-read Clarke's 1971 short story A Meeting with Medusa about a dirigible pilot who ventures down into the upper levels of Jupiter's atmosphere (and discovers life there). Kind of like the APOD, but in slow motion.
- Sun May 19, 2024 10:07 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Jupiter Diving (2024 May 19)
- Replies: 10
- Views: 322
Re: APOD: Jupiter Diving (2024 May 19)
Oh well... I was hoping you had access to some kind of time machine.Roy wrote: ↑Sun May 19, 2024 4:27 pmYeah - meant to say 8 years. Probably age-related error. Hate it when that happens.Chris Peterson wrote: ↑Sun May 19, 2024 2:50 pm???Roy wrote: ↑Sun May 19, 2024 2:40 pm Copyright said 2017 - I am sorry I have not seen this in the 28 years since then!
- Sun May 19, 2024 2:50 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Jupiter Diving (2024 May 19)
- Replies: 10
- Views: 322
Re: APOD: Jupiter Diving (2024 May 19)
???Roy wrote: ↑Sun May 19, 2024 2:40 pm Copyright said 2017 - I am sorry I have not seen this in the 28 years since then!
- Sat May 18, 2024 7:28 pm
- Forum: The Observation Deck: Latest Sky Photography
- Topic: Submissions: 2024 May
- Replies: 98
- Views: 5664
Re: Submissions: 2024 May
NGC 2903 A pretty spiral galaxy in Leo, with a very obvious bar (estimated to contain 20% of the galaxy's mass), tightly wound arms, and a lot of starburst activity in the center. Details: QSI 660 camera on 250mm RC, Astronomic RGB filters. 40 minutes each red, green, and blue. Processed with PixIn...
- Sat May 18, 2024 5:07 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Colors of Twilight vs. Sunset/Sunrise
- Replies: 38
- Views: 3545
Re: Colors of Twilight vs. Sunset/Sunrise
The lower blue part of the Belt is just the twilight sky rising (or setting). In the evening I sometimes call it "nightrise". So yeah, it is only lit indirectly, by light that has scattered from air still lit by the Sun directly. So every moment of twilight involves some combination of di...
- Sat May 18, 2024 4:17 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Colors of Twilight vs. Sunset/Sunrise
- Replies: 38
- Views: 3545
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. When I think of Descartes on clear and distinct ideas, where “distinct” perceptions are "sharply separated from all other perceptions&qu...
- 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: 434
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: 434
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: 38
- Views: 3545
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: 1152
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: 1152
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: 1152
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: 1152
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: 17895
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: 38
- Views: 3545
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: 640
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: 17895
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: 1152
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: 1152
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: 1152
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: 640
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: 640
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: 640
- 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: 1076426
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...