Search found 2955 matches
- Sun May 12, 2024 1:04 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: AR 3664: Giant Sunspot Group (2024 May 11)
- Replies: 25
- Views: 1248
Re: APOD: AR 3664: Giant Sunspot Group (2024 May 11)
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 time from the Sun and the extreme improbability of it NOT being so. The flares and ejectio...
- Sat May 11, 2024 11:01 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: AR 3664: Giant Sunspot Group (2024 May 11)
- Replies: 25
- Views: 1248
Re: APOD: AR 3664: Giant Sunspot Group (2024 May 11)
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 group, and are responsible for th...
- Sat May 11, 2024 9:27 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: AR 3664: Giant Sunspot Group (2024 May 11)
- Replies: 25
- Views: 1248
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 7:39 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: AR 3664: Giant Sunspot Group (2024 May 11)
- Replies: 25
- Views: 1248
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 5:35 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: AR 3664: Giant Sunspot Group (2024 May 11)
- Replies: 25
- Views: 1248
Re: APOD: AR 3664: Giant Sunspot Group (2024 May 11)
Sunspot groups remind me of random Life patterns (as in Conway's cellular automaton "Game of Life"). Here's an illustrative example I just created with the very excellent "Golly" app: https://asterisk.apod.com/download/file.php?id=49682&t=1 But the location of sunspots on th...
- Sat May 11, 2024 5:11 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: AR 3664: Giant Sunspot Group (2024 May 11)
- Replies: 25
- Views: 1248
Re: APOD: AR 3664: Giant Sunspot Group (2024 May 11)
Sunspot groups remind me of random Life patterns (as in Conway's cellular automaton "Game of Life"). Here's an illustrative example I just created with the very excellent "Golly" app: sunspot group life pattern.jpg And hey, the Sun's atmosphere is even partitioned into "cell...
- Sat May 11, 2024 1:26 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Simulation: Two Black Holes Merge (2024 May 10)
- Replies: 21
- Views: 1064
Re: APOD: Simulation: Two Black Holes Merge (2024 May 10)
Does a pair of BHs have to lose any of its total mass-energy to merge? Can the two BHs just get closer (losing potenial energy and gaining kinetic energy) and then merge in a central collision? It seems to me that a straight line collision would involve minimum of going around and radiating away on...
- Fri May 10, 2024 6:59 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Simulation: Two Black Holes Merge (2024 May 10)
- Replies: 21
- Views: 1064
Re: APOD: Simulation: Two Black Holes Merge (2024 May 10)
I don't think there are any missing words. When a mass is allowed to move in a gravitational field, its velocity increases, which represents a conversion of gravitational potential energy to kinetic energy. Right? And any accelerating mass generates gravitational waves ("acceleration" can...
- Fri May 10, 2024 6:29 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Simulation: Two Black Holes Merge (2024 May 10)
- Replies: 21
- Views: 1064
Re: APOD: Simulation: Two Black Holes Merge (2024 May 10)
In the mundane world, gravitational potential energy gets converted to kinetic energy, gets converted to gravitational waves all the time. Like when you drop a rock. But it takes something as massive as merging black holes or neutron stars to produce strong enough gravitational waves for our existi...
- Fri May 10, 2024 6:12 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Simulation: Two Black Holes Merge (2024 May 10)
- Replies: 21
- Views: 1064
Re: APOD: Simulation: Two Black Holes Merge (2024 May 10)
Neither black hole lost mass. The individual precursor black holes merged to form a new black hole, and it has a higher mass than either of the precursors. The total mass difference reflects the conversion of gravitational potential energy (as the two precursors got closer) into kinetic energy, and...
- Fri May 10, 2024 5:46 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Simulation: Two Black Holes Merge (2024 May 10)
- Replies: 21
- Views: 1064
Re: APOD: Simulation: Two Black Holes Merge (2024 May 10)
Hello everybody, I have a question about the BHs' masses. I imagined that nothing could escape from a BH (except perhaps by Hawking radiation) but it seems that part of the mass of a couple of merging BHs is radiated as GW. I suspect that the energy emitted as GW comes from the kinetic/gravitationa...
- Wed May 08, 2024 6:28 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Black Hole Accreting with Jet (2024 May 07)
- Replies: 17
- Views: 857
Re: APOD: Black Hole Accreting with Jet (2024 May 07)
I don't think the quote is a good description at all. A black hole is an entity which is sufficiently dense that there is a region around it (bounded by the event horizon... which itself isn't a physical thing) where the escape velocity is greater than c. Really, that's all. Every visual aspect of ...
- Wed May 08, 2024 6:24 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Black Hole Accreting with Jet (2024 May 07)
- Replies: 17
- Views: 857
Re: APOD: Black Hole Accreting with Jet (2024 May 07)
Photons are just packets of energy. Presumably the energy is converted to its mass form once a photon falls into a black hole. The black hole keeps its energy; it doesn't keep its "light". That implies a cool idea! All the photons of every star in the sky that reach a black hole are conti...
- Wed May 08, 2024 6:07 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Visualization: A Black Hole Disk... (2024 May 08)
- Replies: 13
- Views: 1041
Re: APOD: Visualization: A Black Hole Disk... (2024 May 08)
There's far too much here for me to understand, but I'll ask this question: what's the difference between the event horizon and the photons sphere, and why it the photon sphere 50% larger than the event horizon? At least that's what I'm seeing at Wikipedia: A photon sphere [1] or photon circle [2] i...
- Tue May 07, 2024 6:52 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Black Hole Accreting with Jet (2024 May 07)
- Replies: 17
- Views: 857
Re: APOD: Black Hole Accreting with Jet (2024 May 07)
From the link posted just above: "You can roughly think of a black hole as a star that traps all of its light" . I like the " its " light. We normally read that "even light" can't escape a black hole, but saying "its" own light makes me wonder further. For in...
- Mon May 06, 2024 6:26 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Total Solar Eclipse from Sliver to... (2024 May 06)
- Replies: 7
- Views: 654
Re: APOD: A Total Solar Eclipse from Sliver to... (2024 May 06)
Nice to see the diamonds of the two rings on diametrically opposite sides through the center, as god intended. (Yeah, I know Chris has pointed out that it might not appear like this in other totality locations.)
- Sun May 05, 2024 4:47 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Black Hole Disrupts a Passing Star (2024 May 05)
- Replies: 29
- Views: 1083
Re: APOD: A Black Hole Disrupts a Passing Star (2024 May 05)
A black hole's "gravitational effect" is determined by its mass. The event horizon isn't a real thing, just a boundary that defines where light can't escape. It really has little physical meaning. We're talking here about stellar mass black holes interacting with stars . That is, objects ...
- Sun May 05, 2024 4:36 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Black Hole Disrupts a Passing Star (2024 May 05)
- Replies: 29
- Views: 1083
Re: APOD: A Black Hole Disrupts a Passing Star (2024 May 05)
The mass of the black hole doesn't matter, except to the extent that it's a factor in determining the orbit. Whether it hits the star depends on whether its orbit intersects the interior of the star. This is basically no different than two stars passing by each other, except in the case of the blac...
- Sun May 05, 2024 4:06 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Black Hole Disrupts a Passing Star (2024 May 05)
- Replies: 29
- Views: 1083
Re: APOD: A Black Hole Disrupts a Passing Star (2024 May 05)
The tidal force of a black hole, because it is so small, is also small. Something doesn't feel tidal distortion around a black hole until it's about to fall in. (And with supermassive black holes, after it's fallen past the event horizon.) I edited my post with more queries... The mass of the black...
- Sat May 04, 2024 8:18 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: 3 ATs (2024 May 04)
- Replies: 5
- Views: 418
Re: APOD: 3 ATs (2024 May 04)
The 3ATs are certainly an advantage for us who keep on looking for new pictures of the infinity of the Cosmos. It is also fascinating that our beautiful Earth will not be destroyed but only be transformed into a New Earth just like other planets like Mars to be terraformed. Well, your title certain...
- Sat May 04, 2024 4:07 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: 3 ATs (2024 May 04)
- Replies: 5
- Views: 418
Re: APOD: 3 ATs (2024 May 04)
I searched in vain on the ESO site for an annotated overall map of the VLTI facility but came up empty. But google was my friend. Sadly though, the - much! - smaller R2D2-like ATs on their tracks aren't labeled, but are clear to see in the lower parts of the photo: https://www.eso.org/sci/facilities...
- Sat May 04, 2024 12:50 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: M100: A Grand Design Spiral Galaxy (2024 May 02)
- Replies: 34
- Views: 1917
Re: APOD: M100: A Grand Design Spiral Galaxy (2024 May 02)
Well. When I look at the galaxy in IR, it doesn't remind me much of a bar either. ...more like an alien.... :evil: https://live.staticflickr.com/65535/52800764387_d5f66eb24a_c.jpg Image source: SST ... https://live.staticflickr.com/65535/52801748535_57b2c13737_b.jpg Image source: HST jac berne (fli...
- Fri May 03, 2024 10:07 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Temperatures on Exoplanet WASP-43b (2024 May 03)
- Replies: 25
- Views: 917
Re: APOD: Temperatures on Exoplanet WASP-43b (2024 May 03)
I find it interesting that the trailing side is slightly hotter than the leading side. That's what I was wondering. If the planet was rocky, I suppose the temp would be similar to it's present state, except that it would take longer to go from sun-side to dark-side? But that is I guess a moot point...
- Fri May 03, 2024 10:06 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Temperatures on Exoplanet WASP-43b (2024 May 03)
- Replies: 25
- Views: 917
Re: APOD: Temperatures on Exoplanet WASP-43b (2024 May 03)
The last link says the winds are 5,000 mph!wilddouglascounty wrote: ↑Fri May 03, 2024 8:03 pm Seems like the winds must be unreal on such a system, and judging from the heat retention, the atmosphere pretty darn thick. It would be interesting for someone to make a stab at modeling such extreme conditions!
- Fri May 03, 2024 7:46 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: M100: A Grand Design Spiral Galaxy (2024 May 02)
- Replies: 34
- Views: 1917
Re: APOD: M100: A Grand Design Spiral Galaxy (2024 May 02)
I just told you that I don't necessarily always trust Wikipedia, but now I'm going to quote Wikipedia anyway to back up my claim that there are two bars in NGC 1365: And I can see the bars of NGC 1365. :wink: Ann Is there even a definition of a "bar" based on something other than mere app...