The Man in the Moon got a bit of a haircut last night!
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- Wed Sep 18, 2024 2:28 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Find the Man in the Moon (2024 Sep 15)
- Replies: 14
- Views: 1003
- Mon Sep 16, 2024 1:49 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Find the Man in the Moon (2024 Sep 15)
- Replies: 14
- Views: 1003
Re: APOD: Find the Man in the Moon (2024 Sep 15)
On my iPad anyway, if I long press the image, the hover-over image shows up. Ditto for my Android phone. I don't on my Android phone. Just a context menu. Which is what I'd expect unless some very specific coding on the website isn't done. Odd. It only works if you long press on the image on the pa...
- Sun Sep 15, 2024 8:26 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Find the Man in the Moon (2024 Sep 15)
- Replies: 14
- Views: 1003
Re: APOD: Find the Man in the Moon (2024 Sep 15)
Ooop! Sorry, I failed to see that this is a "roll-on-roll off" (RORO) image showing different images depending on whether the cursor is on the image or not. Will all viewers have access to the RORO feature? I'm not sure if that works on touchscreen devices. Hover operations generally don'...
- Sun Sep 15, 2024 2:18 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Find the Man in the Moon (2024 Sep 15)
- Replies: 14
- Views: 1003
Re: APOD: Find the Man in the Moon (2024 Sep 15)
Ooop! Sorry, I failed to see that this is a "roll-on-roll off" (RORO) image showing different images depending on whether the cursor is on the image or not. Will all viewers have access to the RORO feature? I'm not sure if that works on touchscreen devices. Hover operations generally don'...
- Sun Sep 15, 2024 2:06 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Find the Man in the Moon (2024 Sep 15)
- Replies: 14
- Views: 1003
- Thu Sep 12, 2024 2:57 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Young Star Cluster NGC 1333 (2024 Sep 12)
- Replies: 6
- Views: 969
Re: APOD: Young Star Cluster NGC 1333 (2024 Sep 12)
On the lower right, is this a planetary disk seen edge-on ? It is clearly a disk of some sort. APOD 12 September 2024 detail.png I'd say it's the the accretion disk, or the remnant of the accretion disk, around a young star. No obvious signs of planet formation can be seen at this resolution and ma...
- Thu Sep 12, 2024 4:27 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: M31: The Andromeda Galaxy (2024 Sep 08)
- Replies: 17
- Views: 1354
Re: APOD: M31: The Andromeda Galaxy (2024 Sep 08)
[...] As Newton claimed, he considered that "the great ocean of truth lay all undiscovered before me", and Feynman claimed that anyone who claims to understand quantum mechanics does not understand quantum mechanics. And, of course, we need to remember that these mathematical models of 'r...
- Wed Sep 11, 2024 2:17 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: M31: The Andromeda Galaxy (2024 Sep 08)
- Replies: 17
- Views: 1354
Re: APOD: M31: The Andromeda Galaxy (2024 Sep 08)
"I think you've missed my point, which is just that there aren't very many fundamental natural laws, and we appear to understand most of them." Well, maybe, but how do you know "that there aren't very many fundamental natural laws", and what do you mean by "aren't very many...
- Wed Sep 11, 2024 1:04 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: M31: The Andromeda Galaxy (2024 Sep 08)
- Replies: 17
- Views: 1354
Re: APOD: M31: The Andromeda Galaxy (2024 Sep 08)
It depends on what you mean by "almost everything". There are lots of things we do not know. There is currently no analytic solution to the three body problem in either Newtonian Dynamics or General Relativity, and as for many-body problems, we can simulate using computers, but these brea...
- Tue Sep 10, 2024 9:35 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: M31: The Andromeda Galaxy (2024 Sep 08)
- Replies: 17
- Views: 1354
Re: APOD: M31: The Andromeda Galaxy (2024 Sep 08)
In the past (300 to 30 years in past), I'm sure people felt same as what you are feeling now. Someone thought they knew Earth was flat. Someone thought they knew Earth was center of universe. And as recently as 30 yrs ago, before someone "discovered" dark energy and the impact it has, peo...
- Tue Sep 10, 2024 4:39 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Horsehead and Orion Nebulas (2024 Sep 10)
- Replies: 12
- Views: 1258
- Mon Sep 09, 2024 10:46 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Mars: Moon, Craters, and Volcanos (2024 Sep 09)
- Replies: 6
- Views: 707
Re: APOD: Mars: Moon, Craters, and Volcanos (2024 Sep 09)
the largest volcano in the Solar System One hates to be pedantic, but shouldn't that be "The largest known volcano in the Solar System" ? Or are we really sure about this? I think we're pretty sure. We've mapped the surface of all the terrestrial planets, and all the large moons. The poss...
- Mon Sep 09, 2024 5:06 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: M31: The Andromeda Galaxy (2024 Sep 08)
- Replies: 17
- Views: 1354
Re: APOD: M31: The Andromeda Galaxy (2024 Sep 08)
Chris, i respect your knowledge and you are entitled to any opinion (including your above prediction). I'm no Aristotle or Einstein but they both seem to be in agreement with me. Their own quotes = Aristotle ("The more you know, more you know that you don't know") and Einstein ("What...
- Mon Sep 09, 2024 4:49 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: M31: The Andromeda Galaxy (2024 Sep 08)
- Replies: 17
- Views: 1354
Re: APOD: M31: The Andromeda Galaxy (2024 Sep 08)
I checked the link for "passes right" (https://www.science.org/content/article/milky-way-may-escape-fated-collision-andromeda-galaxy), I'm glad many scientists openly said we don't know many things and so it's impossible to simulate and predict any deterministic ways. I absolutely agree. ...
- Mon Sep 09, 2024 4:27 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: M31: The Andromeda Galaxy (2024 Sep 08)
- Replies: 17
- Views: 1354
Re: APOD: M31: The Andromeda Galaxy (2024 Sep 08)
I checked the link for "passes right" (https://www.science.org/content/article/milky-way-may-escape-fated-collision-andromeda-galaxy), I'm glad many scientists openly said we don't know many things and so it's impossible to simulate and predict any deterministic ways. I absolutely agree. ...
- Sat Sep 07, 2024 1:11 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Ringed Ice Giant Neptune (2024 Sep 06)
- Replies: 8
- Views: 934
Re: APOD: Ringed Ice Giant Neptune (2024 Sep 06)
Neptune and Uranus are much the same pale cyan hue, and the processes that cause this color - atmospheric methane that absorbs infrared light - are much the same. Absorbing IR cannot make anything look blue. That requires absorbing longer visible wavelengths, like red and yellow. We are seeing all ...
- Sat Sep 07, 2024 4:40 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Ringed Ice Giant Neptune (2024 Sep 06)
- Replies: 8
- Views: 934
Re: APOD: Ringed Ice Giant Neptune (2024 Sep 06)
So, Neptune's atmospheric methane both absorbs infrared (getting warmer I suppose), and then also emits infrared that is visible to JWST here? Or is it only the "High altitude clouds that reach above most of Neptune's absorbing methane" that we are seeing here? (And that also must be emit...
- Fri Sep 06, 2024 2:27 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Quarter Moon and Sister Stars (2024 Sep 03)
- Replies: 18
- Views: 1900
Re: APOD: Quarter Moon and Sister Stars (2024 Sep 03)
Not at all. It seems like one plausible hypothesis, of several.Guest wrote: ↑Fri Sep 06, 2024 2:12 pm All elements are explained at dcwalley.com/sky-disc. Seems convincing.
- Wed Sep 04, 2024 4:54 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Quarter Moon and Sister Stars (2024 Sep 03)
- Replies: 18
- Views: 1900
Re: APOD: Quarter Moon and Sister Stars (2024 Sep 03)
Nobody knows exactly what all the elements on the disk are.Guest wrote: ↑Wed Sep 04, 2024 4:45 pm The arc on the Nebra disk is not a boat, it is the path of the star Vega near the winter solstice.
- Tue Sep 03, 2024 10:38 pm
- Forum: The Observation Deck: Latest Sky Photography
- Topic: Submissions: 2024 September
- Replies: 71
- Views: 3685
Re: Submissions: 2024 September
The Iris Nebula NGC 7023, the aptly named Iris Nebula, a beautiful reflection nebula in Cepheus (although I have detected some faint H-alpha emissions when imaged with a narrowband filter). The illuminating star creating the reflection is magnitude 7.4. Imaged 2024 September 1-3. Details: QSI 660 c...
- Tue Sep 03, 2024 4:09 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Quarter Moon and Sister Stars (2024 Sep 03)
- Replies: 18
- Views: 1900
Re: APOD: Quarter Moon and Sister Stars (2024 Sep 03)
I expected the link in the text to “eight successive” exposures to show those eight individual images instead of a picture of eight cats. Any explanation? And of course, then there is the Moon and the Pleiades, minus any cats. https://upload.wikimedia.org/wikipedia/commons/thumb/e/e9/Nebra_disc_1.j...
- Tue Sep 03, 2024 3:24 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Quarter Moon and Sister Stars (2024 Sep 03)
- Replies: 18
- Views: 1900
Re: APOD: Quarter Moon and Sister Stars (2024 Sep 03)
I think of it as although it's face is half lit from our perspective, it's deemed a quarter moon since it's a quarter of the way through a full cycle of phases: https://c.tadst.com/gfx/750x500/moon-phases-explained.png Except in this case it's three quarters of the way through a full cycle. It's a ...
- Tue Sep 03, 2024 1:48 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Quarter Moon and Sister Stars (2024 Sep 03)
- Replies: 18
- Views: 1900
Re: APOD: Quarter Moon and Sister Stars (2024 Sep 03)
Isn't that a half moon? It was a "third quarter moon". Not "quarter" by itself, and certainly commonly called "half". I think of it as although it's face is half lit from our perspective, it's deemed a quarter moon since it's a quarter of the way through a full cycle o...
- Tue Sep 03, 2024 6:43 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Quarter Moon and Sister Stars (2024 Sep 03)
- Replies: 18
- Views: 1900
Re: APOD: Quarter Moon and Sister Stars (2024 Sep 03)
It was a "third quarter moon". Not "quarter" by itself, and certainly commonly called "half".SeedsofEarfth wrote: ↑Tue Sep 03, 2024 4:17 am Isn't that a half moon?
- Mon Sep 02, 2024 5:39 pm
- Forum: The Observation Deck: Latest Sky Photography
- Topic: Submissions: 2024 September
- Replies: 71
- Views: 3685
Re: Submissions: 2024 September
The Wizard Nebula Sharpless 142, an emission nebula in Cepheus energized by open cluster NGC 7380. This narrowband image of the central nebula is rendered in the Hubble palette. Imaged late August 2024. Details: QSI 660 camera on 250mm RC, Astronomic SHORGB filters. 3.5 hours each H-alpha (mapped t...