Search found 13103 matches
- Sat May 11, 2024 9:20 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: AR 3664: Giant Sunspot Group (2024 May 11)
- Replies: 8
- Views: 239
Re: APOD: AR 3664: Giant Sunspot Group (2024 May 11)
Malmö is heavily light-polluted, which is why it's so remarkable that auroras could be seen in our skies. In more rural areas in the southernmost region of Sweden, auroras looked a lot more impressive. https://static.bonniernews.se/bildix/api/images/35f747b4-811b-4e13-9192-fa5611651806.jpeg?fit=crop...
- Sat May 11, 2024 5:48 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: AR 3664: Giant Sunspot Group (2024 May 11)
- Replies: 8
- Views: 239
Re: APOD: AR 3664: Giant Sunspot Group (2024 May 11)
https://apod.nasa.gov/apod/image/2405/SunAr3664_Fantasia_960.jpg So this thing is really big. And active, too. It always bothered me that sunspots are dark because they are cooler than their surroundings, and yet they are so active. Why would cooler things be more active than hotter things? Then ag...
- Fri May 10, 2024 4:20 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Simulation: Two Black Holes Merge (2024 May 10)
- Replies: 21
- Views: 645
Re: APOD: Simulation: Two Black Holes Merge (2024 May 10)
Cool video. :ssmile: What about the final parsec problem, though? In other words, how was this merger even possible? BBC Sky at Night wrote: In order to spiral towards one another, the two black holes must first shed energy. To start with, that energy is transferred to surrounding material, includin...
- Fri May 10, 2024 3:42 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Visualization: A Black Hole Disk... (2024 May 08)
- Replies: 12
- Views: 630
Re: APOD: Visualization: A Black Hole Disk... (2024 May 08)
https://live.staticflickr.com/65535/53708332748_87991b8d62_b.jpg Pic1 NGC 383 and NGC 315: jac berne (flickr) LOFAR Survey (VLA:RADIO) NGC 383 (3C31) has a supermassive hole between 290 million and 1.3 billion solar masses, which isn't exactly accurate. In the first image (Pic 1) you can also see N...
- Thu May 09, 2024 9:19 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Total Solar Eclipse from Sliver to... (2024 May 06)
- Replies: 6
- Views: 384
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.) [size=1 papa's games [/size] A total solar eclipse may be both thrilling and incredibly...
- Wed May 08, 2024 4:43 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Visualization: A Black Hole Disk... (2024 May 08)
- Replies: 12
- Views: 630
Re: APOD: Visualization: A Black Hole Disk... (2024 May 08)
https://apod.nasa.gov/apod/calendar/S_240508.jpg Visualization: A Black Hole Accretion Disk Explanation: What would it look like to circle a black hole? If the black hole was surrounded by a swirling disk of glowing and accreting gas , then the great gravity of the black hole would deflect light em...
- Tue May 07, 2024 4:42 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Black Hole Accreting with Jet (2024 May 07)
- Replies: 17
- Views: 602
Re: APOD: Black Hole Accreting with Jet (2024 May 07)
Well, you know, that's a beautiful, ethereal, whimsical aerial dance of the remnants of a ripped-apart star, like the dance of the seven veils! It reminds me a little bit - not a lot, but a little bit - of the recent APOD showing Mt. Etna blowing smoke rings. BlackHole_Simonnet_960[1].jpg Black Hole...
- Mon May 06, 2024 5:22 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: 956
Re: APOD: M100: A Grand Design Spiral Galaxy (2024 May 02)
Okay, I'm finally ready to talk about today's splendid APOD, and I don't really know where to start. Let's start with an annotated version of the APOD! APOD 2 May 2024 annotated.png Majestic grand design galaxy M100 and friends. Credit: Drew Evans. M100 is surrounded by a lot of friends, or satelli...
- Mon May 06, 2024 4:57 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: 839
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...
- Mon May 06, 2024 4:31 am
- 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: 839
Re: APOD: A Black Hole Disrupts a Passing Star (2024 May 05)
https://apod.nasa.gov/apod/calendar/S_240505.jpg A Black Hole Disrupts a Passing Star Explanation: What happens to a star that goes near a black hole? If the star directly impacts a massive black hole , then the star falls in completely -- and everything vanishes. More likely , though, the star goe...
- Sun May 05, 2024 10:31 am
- 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: 839
Re: APOD: A Black Hole Disrupts a Passing Star (2024 May 05)
Okay, cool, but... https://apod.nasa.gov/apod/image/2405/BhShredder_NASA_1080.jpg APOD 5 May 2024 annotated.png Can anyone answer my questions? Ann I fear this is another "artist's representation" that is not very connected to reality. So what needs to change in order to make it more real...
- Sun May 05, 2024 4:27 am
- 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: 839
Re: APOD: A Black Hole Disrupts a Passing Star (2024 May 05)
Okay, cool, but...
Can anyone answer my questions?
Ann
Can anyone answer my questions?
Ann
- Sat May 04, 2024 7:17 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: 3 ATs (2024 May 04)
- Replies: 5
- Views: 350
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...
- Fri May 03, 2024 1:23 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: 956
Re: APOD: M100: A Grand Design Spiral Galaxy (2024 May 02)
Still not much of a definitive bar in M61 at all compared to your other examples. And I'm not convinced of the "inner" bar in NGC 1365 either! "A bar is in the eye of the beholder" it seems. I just told you that I don't necessarily always trust Wikipedia, but now I'm going to qu...
- Fri May 03, 2024 5:18 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: M100: A Grand Design Spiral Galaxy (2024 May 02)
- Replies: 34
- Views: 956
Re: APOD: M100: A Grand Design Spiral Galaxy (2024 May 02)
Let's look at a truly barred galaxy, M61: Wikipedia thinks M61 is an intermediate barred spiral: Messier 61 (also known as M61, NGC 4303, or the Swelling Spiral Galaxy) is an intermediate barred spiral galaxy in the Virgo Cluster of galaxies. It was first discovered by Barnaba Oriani on May 5, 1779...
- Thu May 02, 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: 956
- Thu May 02, 2024 7:17 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: 956
Re: APOD: M100: A Grand Design Spiral Galaxy (2024 May 02)
Am I correct in thinking that M100 is not a "barred" galaxy? And if so, do we understand why some galaxies are barred and others are not? Wikipedia called M100 an intermediate spiral galaxy: Wikipedia wrote: Messier 100 (also known as NGC 4321 or the Mirror Galaxy) is a grand design inter...
- Thu May 02, 2024 6:55 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: 956
Re: APOD: M100: A Grand Design Spiral Galaxy (2024 May 02)
Sadly, this "One of the brightest members of the Virgo Cluster of galaxies, M100, also known as NGC 4321 " is not even shown at the Virgo Cluster APOD link: https://apod.nasa.gov/apod/image/1104/201103_VirgoGCM_andreo900lab.jpg That's because M100 is located too far away from the center o...
- Thu May 02, 2024 6:32 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: 956
Re: APOD: M100: A Grand Design Spiral Galaxy (2024 May 02)
Okay, I'm finally ready to talk about today's splendid APOD, and I don't really know where to start. Let's start with an annotated version of the APOD! APOD 2 May 2024 annotated.png Majestic grand design galaxy M100 and friends. Credit: Drew Evans. M100 is surrounded by a lot of friends, or satellit...
- Thu May 02, 2024 5:01 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: M100: A Grand Design Spiral Galaxy (2024 May 02)
- Replies: 34
- Views: 956
Re: APOD: M100: A Grand Design Spiral Galaxy (2024 May 02)
Thank you very much. Extremely honored again. 🙏🏼 I am blessed with Bortle 2 skies in Northern Arizona. -Drew https://www.astrobin.com/users/DrewJEvans/ https://NAZObservatory.com Absolutely superb image, Drew! :D :thumb_up: :clap: I'll try to comment on it (and on galaxy M100 in general) later toda...
- Wed May 01, 2024 4:13 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: GK Per: Nova and Planetary Nebula (2024 Apr 30)
- Replies: 16
- Views: 861
Re: APOD: GK Per: Nova and Planetary Nebula (2024 Apr 30)
Avalon wrote: ↑Wed May 01, 2024 3:39 am So is that little "stem" between 7:00 and 8:00 on the image a jet of some sort?
That's the only explanation I can think of.
Ann
- Wed May 01, 2024 4:05 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: GK Per: Nova and Planetary Nebula (2024 Apr 30)
- Replies: 16
- Views: 861
Re: APOD: GK Per: Nova and Planetary Nebula (2024 Apr 30)
Once again a masterpiece! Congratulations to the Deep Sky Collective team. Be sure to click twice on the image to see the Nova up close, gorgeous object! I like cosmic dandelions too! ...and when you overlay older images (e.g. from Hubble) you can clearly see how the nova is developing... https://l...
- Tue Apr 30, 2024 8:09 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: GK Per: Nova and Planetary Nebula (2024 Apr 30)
- Replies: 16
- Views: 861
Re: APOD: GK Per: Nova and Planetary Nebula (2024 Apr 30)
Not so with supernovas. And it's fascinating to think that supernovas type Ia form in much the same way as cataclysmic novas like GK Per. The difference is that so much matter builds up on the white dwarf's surface that the white dwarf reaches its Chandrasekhar limit, the maximum mass of a white dw...
- Tue Apr 30, 2024 6:57 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: GK Per: Nova and Planetary Nebula (2024 Apr 30)
- Replies: 16
- Views: 861
Re: APOD: GK Per: Nova and Planetary Nebula (2024 Apr 30)
I don't automatically comment on planetary nebula images, because I don't have a handle on their colors. I trust that I know the colors of stars, because I made a great effort to observe all sorts of (reasonably bright) stars to assess their colors, but I never managed to detect color in the few pla...
- Mon Apr 29, 2024 7:49 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: NewJWST: New Pictures from JWST
- Replies: 21
- Views: 15080
Re: NewJWST: New Pictures from JWST
NGC 2775 https://live.staticflickr.com/65535/53684201177_568179eac3_b.jpg https://live.staticflickr.com/65535/53685293768_3dd15e8fed_b.jpg jac berne (flickr) Original data: NASA/ESA/CSA Have you yourself processed the NASA/ESA/CSA data to produce this image, Jac? It's glorious! And NGC 2775 is such...