Search found 198 matches
- Wed May 20, 2020 1:30 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Journey into the Cosmic Reef (2020 May 18)
- Replies: 50
- Views: 20162
Re: APOD: Journey into the Cosmic Reef (2020 May 18)
Well, if we interpret color with our eyes, and our eyes never see green in any stars, I don't know what to say other than stars aren't green. And if that makes me stupid then I'll take stupid. Here's a picture of a star that ended up green. https://flic.kr/p/2iFw1Hk Here's another star that was gre...
- Tue May 05, 2020 1:19 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Carina in Perspective (2020 May 05)
- Replies: 12
- Views: 3416
Re: APOD: Carina in Perspective (2020 May 05)
Nice photo!
But, how does this Southern Cross work?
Do either of the "crossbars" point South?
Is the South Celestial Pole "visible" in this photo?
(Feeling blessed us people in Up Over have such a definite pole star)
Thanks for any response!
But, how does this Southern Cross work?
Do either of the "crossbars" point South?
Is the South Celestial Pole "visible" in this photo?
(Feeling blessed us people in Up Over have such a definite pole star)
Thanks for any response!
- Mon Apr 27, 2020 1:54 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Fresh Tiger Stripes on Saturn's... (2020 Apr 27)
- Replies: 18
- Views: 5739
Re: APOD: Fresh Tiger Stripes on Saturn's... (2020 Apr 27)
be nice to drag this little world into the goldilocks zone and let the ice melt! :mrgreen: My guess (hardly scientific); is that if Enceladus were brought close enough to the Sun to melt the ice, the gravity and atmosphere of such a small "moon" would not be enough to keep the water from ...
- Fri Apr 24, 2020 2:20 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Eye on the Milky Way (2020 Apr 21)
- Replies: 15
- Views: 6701
Re: APOD: Eye on the Milky Way (2020 Apr 21)
Ann,
Thank you very much for the "play by play"!
You went above and beyond answering my question!
I did get a couple of bad links, but that may be an effect of the nanny router here at work.
Thank you very much for the "play by play"!
You went above and beyond answering my question!
I did get a couple of bad links, but that may be an effect of the nanny router here at work.
- Tue Apr 21, 2020 1:24 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Cosmic Triangle (2020 Apr 15)
- Replies: 20
- Views: 4208
Re: APOD: A Cosmic Triangle (2020 Apr 15)
Picking chokecherries was a common activity in my childhood, which lead to chokecherry syrup on pancakes. :-D (Not to be confused with Choke Berries, a different plant) Chokecherries were sometimes used in making pemmican. (A friend once told me, "If you are offered some pemmican, refuse it!&q...
- Tue Apr 21, 2020 1:18 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Eye on the Milky Way (2020 Apr 21)
- Replies: 15
- Views: 6701
Re: APOD: Eye on the Milky Way (2020 Apr 21)
Kinda creepy looking, but also awesome!
What is the cluster of bright stars near the bright spot on the left (Jupiter) of the Milky Way?
What is the cluster of bright stars near the bright spot on the left (Jupiter) of the Milky Way?
- Thu Apr 16, 2020 1:47 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Cosmic Triangle (2020 Apr 15)
- Replies: 20
- Views: 4208
Re: APOD: A Cosmic Triangle (2020 Apr 15)
Picking chokecherries was a common activity in my childhood, which lead to chokecherry syrup on pancakes. :-D (Not to be confused with Choke Berries, a different plant) Chokecherries were sometimes used in making pemmican. (A friend once told me, "If you are offered some pemmican, refuse it!&qu...
- Thu Apr 16, 2020 1:34 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Sailing Stone across Death Valley (2020 Apr 13)
- Replies: 12
- Views: 5053
Re: APOD: A Sailing Stone across Death Valley (2020 Apr 13)
Based on email from James Norris, a leading authority and author on the sailing stones, the last sentence of the APOD text on the main NASA site has now been updated to read "It turns out that in winter thin floating ice sheets form in a rare ephemeral lake, and light winds push ice sections t...
- Thu Apr 16, 2020 1:32 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Comet ATLAS Breaks Up (2020 Apr 16)
- Replies: 7
- Views: 3580
Re: APOD: Comet ATLAS Breaks Up (2020 Apr 16)
"She's breakin' up on us Captain!"
-Engineering Officer Montgomery Scott
-Engineering Officer Montgomery Scott
- Fri Apr 10, 2020 1:30 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Flow of Time (2020 Apr 09)
- Replies: 10
- Views: 2252
Re: APOD: A Flow of Time (2020 Apr 09)
I am afraid I never heard of the red/green definition of dawn. An hour or so searching this morning got me no closer. I will check back later in hopes of a reference or link. Beautiful picture of the day! I'm afraid I'm not of further assistance in that regard. It may have been in the latter 1970's...
- Thu Apr 09, 2020 3:27 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Country Sky versus City Sky (2020 Apr 08)
- Replies: 14
- Views: 3409
Re: APOD: Country Sky versus City Sky (2020 Apr 08)
How about an article from an accredited electronics journal?Pikov Andropov wrote: ↑Thu Apr 09, 2020 4:21 am Interesting concept, dark lighting. I am curious as to why the caption was so pseudo-scientific.
https://www.edn.com/zener-enhanced-dark ... -per-watt/
- Thu Apr 09, 2020 1:59 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Country Sky versus City Sky (2020 Apr 08)
- Replies: 14
- Views: 3409
Re: APOD: Country Sky versus City Sky (2020 Apr 08)
I suspect the camera is more sensitive at "seeing" The Milky Way in "the city" than human eyes are...orin stepanek wrote: ↑Wed Apr 08, 2020 11:02 am It is hard to see the MW from aa position within a city! Actually; all these were taken outside the city!
- Thu Apr 09, 2020 1:57 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Country Sky versus City Sky (2020 Apr 08)
- Replies: 14
- Views: 3409
Re: APOD: Country Sky versus City Sky (2020 Apr 08)
Interesting concept, dark lighting. I am curious as to why the caption was so pseudo-scientific. It read more like a post from a politically-driven environmentalist blog than an explanation from a professional astronomer. I assume the grammatical errors and awkward writing style (clunky in places) ...
- Thu Apr 09, 2020 1:39 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Flow of Time (2020 Apr 09)
- Replies: 10
- Views: 2252
Re: APOD: A Flow of Time (2020 Apr 09)
FYI: Military dawn is when you can tell the difference between a red cloth and a green cloth. The US Army had (has?) a small "booklet" with a sample of both cloths to aid commanders in determining when it is "dawn".
- Tue Apr 07, 2020 8:13 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Path North (2020 Apr 07)
- Replies: 19
- Views: 8895
Re: APOD: A Path North (2020 Apr 07)
That's a beautiful picture. My compliments to the photographer. I especially like the zigzag lines you made. This explanation though got me to thinking. If the camera was truly at the north pole, then the circular pattern would be overhead, and now that the season is spring the midnight sun would b...
- Tue Apr 07, 2020 8:10 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Path North (2020 Apr 07)
- Replies: 19
- Views: 8895
Re: A Prolate Trochoid
https://upload.wikimedia.org/wikipedia/commons/4/4b/TrohoidH1%2C25.gif The caption suggests what might make an interesting variation on these images. If one could, over the course of one night, get the camera to move a significant amount northward, say 10 degrees north, all the while otherwise keep...
- Mon Apr 06, 2020 2:16 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Venus and the Sisters (2020 Apr 04)
- Replies: 11
- Views: 2647
Re: APOD: Venus and the Sisters (2020 Apr 04)
We've had overcast skies that past several evenings.
Alas and alack!
Alas and alack!
- Mon Apr 06, 2020 1:53 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: NGC 1672: Barred Spiral Galaxy from... (2020 Apr 06)
- Replies: 16
- Views: 3485
Re: APOD: NGC 1672: Barred Spiral Galaxy from... (2020 Apr 06)
My theory is that "barred galaxies" are illegally parked, and the Intergalactic Police have put a Parking Boot on them until they pay their fine.
https://en.wikipedia.org/wiki/Wheel_clamp
https://en.wikipedia.org/wiki/Wheel_clamp
- Wed Apr 01, 2020 1:29 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: The Galactic Center from Radio to X-ray (2020 Mar 31)
- Replies: 25
- Views: 9701
Re: APOD: The Galactic Center from Radio to X-ray (2020 Mar 31)
What is the width of this scene at the distance of the galactic center? Good question, but the answer is not easy, because time and space are compressed by the black hole, so while it may "look" to be 2^x furlongs wide, there may be an infinite number of furlongs, barleycorn lengths or ce...
- Wed Apr 01, 2020 1:19 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Asteroid or Potato? (2020 Apr 01)
- Replies: 27
- Views: 9096
Re: APOD: Asteroid or Potato? (2020 Apr 01)
All "eyes" are on today's APOD.
The Russians should launch a Spudnik probe for further invegetation.
I wonder if their dictater would risome to the occasion.
The Russians should launch a Spudnik probe for further invegetation.
I wonder if their dictater would risome to the occasion.
- Mon Mar 30, 2020 3:42 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Stars Trail over Ragusa (2020 Mar 28)
- Replies: 40
- Views: 15017
Re: APOD: Stars Trail over Ragusa (2020 Mar 28)
The spatial and temporal coherence of laser light goes beyond simply having the same wavelength. You can easily create light of a single wavelength with a filter, but that light won't be coherent. That also requires that the photons be in phase with each other. That's only possible if they have the...
- Mon Mar 30, 2020 2:52 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Stars Trail over Ragusa (2020 Mar 28)
- Replies: 40
- Views: 15017
Re: APOD: Stars Trail over Ragusa (2020 Mar 28)
[...] By the way, is laser light a sign wave with very high amplitude? [...] As neufer answered correctly, "NO!" LASER light is "coherent", all the photons are at the same [i.e. very close to the same] _frequency_. Each fundamental colour of light has its own frequency, or often...
- Mon Mar 30, 2020 2:36 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Little Drop of Galaxy (2020 Mar 27)
- Replies: 9
- Views: 3485
- Mon Mar 30, 2020 2:35 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: The Colors of Saturn from Cassini (2020 Mar 30)
- Replies: 8
- Views: 2582
Re: APOD: The Colors of Saturn from Cassini (2020 Mar 30)
Upvote to neufer for the obscure reference!
(I remember watching that show as a lad)
(I remember watching that show as a lad)
- Fri Mar 27, 2020 1:35 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Little Drop of Galaxy (2020 Mar 27)
- Replies: 9
- Views: 3485
Re: APOD: A Little Drop of Galaxy (2020 Mar 27)
Okay, a "galaxy in a droplet" beats "galaxy in a marble" from Men in Black!