Starship Asterisk*

The blurb for this APoD says, "The resulting image taken by Webb's NIRcam demonstrates their precise alignment is the best physics will allow." The link in that sentence takes you to a previous APoD that describes "adaptive optics" on an Earthbound telescope, that is just not re...

The blurb for this APoD says, "The resulting image taken by Webb's NIRcam demonstrates their precise alignment is the best physics will allow." The link in that sentence takes you to a previous APoD that describes "adaptive optics" on an Earthbound telescope, that is just not rel...

Eh? You are " discussing nothing here but our universe. No others. " But Chris, you said/wrote, " And indeed, there are observable universes with no contents at all in common." Where are they, how can you observe them? You cannot be referring to the Universes observed by you and ...

We all have different observable universes, with different contents. The closer together we are, the more of those contents that will be the same (probability is not involved). But never all of them. And indeed, there are observable universes with no contents at all in common. Wow! Really? You can ...

What? That we are each at the center of a unique and different observable universe is a simple fact. There is no alternative explanation. An observable universe is defined by a sphere of a certain radius around a 3D point. There are an infinite number of such center points in the Universe. The appa...

To be clear, as this image might be misunderstood, it in no way suggests that there is any "end" or edge to the Universe. Indeed, Chris, which was my point above! But I would not agree with your "Every observer in the Universe has their own observable universe, all different" wh...

Well that may make the Heliocentrists happy, but also seems to big up the Geocentrists!
Copernicus may be either happy or sad, depending on which way he observes this.
John

Raising this subject again, because through a webpage from the Royal Institution ( https://royalsociety.org/blog/2022/03/dish-of-the-day/ ) I've come across a video analysis of the engineering aspects of the collapse. The conclusion seems to be that by the time that the deterioration of the telescop...

And your evidence is the "Farmers Almanack"? That would be funny if this was a Snark we're hunting! And the link to the Wiki page leads to this statement: "Since the introduction of the solar Julian calendar in the Roman Empire, and later the Gregorian calendar worldwide, people no lo...

"called the Snow Moon by some northern cultures" No they don't.
Even the link says "Some North American tribes named it the Hunger Moon" and lists some other fanciful names without any attribution.

OK, my education progresses, but how has the blue overcome the gold, then?

Is the blue star in front of the Gold, from us, then?

One of the widest thread diversions ever, neufer, but weirdly appropriate when we are discussing Blue and Gold, and with every reason today for letting the flag of Ukraine fly in as many places as possible. Albireo is an ancient name, a mixture of Greek, Arabic and Latin according to the Wiki. Beta ...

Thanks to all for the points discussed above. We are often told that space is so big (Its further to the next star than the post office down the road!) so that even when galaxies collide, stars would not. But surely in that vastness, and enormous numbers of stars, a few must at least come close. Was...

Thank you, Ann!
Close, but not that close? Probably any planets in a Goldilocks orbit would only notice a very bright star? Disturbance of their Oort Cloud, if any?

So these two stars (and A is said to be a binary itself) just happen to be in line-of-sight from us? How far apart are they? Would any planets they had be affected if they are close?

Thank you, Ann! And thank you, Victor, wo estimated the bubble to be 750 Light Years across. The Local Bubble that contains the Solar System is about 1000 LY across, and is suggested to have been formed by supernovae, but is largely empty of gas, unlike those in NGC 604. https://www.newscientist.com...

Ignoring the bar, what's at about 11 o'clock on the rim? Looks like a ring of new stars around a void, as if from an enormous explosion!

Marked here:

" potentially intelligent species such as dolphins and humans", who are mostly harmless.

Sorry, I see no resemblance between those things and this dusty nebula. I see no evidence of a jet here. OK, Chris, yiou are the Astronomer. Please teach me! Why is this "dusty", and not a jet? It is certainly jet shaped. I disagree that it is "jet shaped". It looks like a hundr...

I see nothing here that makes me think it is a stellar jet of any kind. Just another dusty region shaped by star formation and stellar winds. No? HH 46/47, MHO 2147 (featured as an APoD only three days ago), HH111, HH34 etc.etc etc. etc All Herbig Haro objects, but if this isn't an HH, what marks i...

Your pareidolia is broken. Maybe you should have that looked at! ;-) That is most patronising, Chris, and unlike you! Come on, astronomer, is this a stellar jet, and if so where from? I see nothing here that makes me think it is a stellar jet of any kind. Just another dusty region shaped by star fo...

Chris Peterson wrote: ↑Mon Jan 24, 2022 1:52 pm

JohnD wrote: ↑Mon Jan 24, 2022 12:19 pm Sorry to ride my hobby horse again, but this nebula looks neither 'creepy' nor like a witch.

Your pareidolia is broken. Maybe you should have that looked at!

That is most patronising, Chris, and unlike you!
Come on, astronomer, is this a stellar jet, and if so where from?

Sorry to ride my hobby horse again, but this nebula looks neither 'creepy' nor like a witch. It looks like a jet, a truly enormous jet from some star early in its formation. Which star might that be?
JOhn

Ann's exxtraordinary photograph demonstrates that coronas may be coloured. Coronas are produced by diffraction around water droplets, which unlike crystals may be of various sizes and so diffract light to a varied extent, leading to the multiple bands seen in her pic. Moreover, you are, of course, c...