Starship Asterisk*

neufer

Click to play embedded YouTube video.

neufer

IN the distant future, M31 will merge with OUR galaxy, and dark energy will have sent all other galaxies beyond the horizon: not longer visible to us on Earth. However, well; that will be QUITE a while from now! Not ALL other galaxies. The galaxies in the Local Group are gravitationally bound. Of c...

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Chris Peterson wrote: ↑Wed Jan 19, 2022 5:48 pm
neufer wrote: ↑Wed Jan 19, 2022 4:00 pm
Chris Peterson wrote: ↑Tue Jan 18, 2022 8:32 pm
My guess is that the illumination here is external. Dust reflecting starlight.
Antares can barely light up its own local dust cloud: https://apod.nasa.gov/apod/ap190827.html
Looks VERY lit up to me!

Antares has competition: https://apod.nasa.gov/apod/ap201014.html

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One of my absolutely favorite clusters is NGC 2362 in Canis Major, and I decided to find it in the full size version of the APOD. I think NGC 2362 has been doubled in today's APOD. factors of 2362 = 1, 2, and 1181 . [1+2+1181 = 1184] factors of 1184 = 1, 2, 4, 8, 16, 32, 37, 74, 148, 296, and 592 ....

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Capturing All That Glitters in Galaxies With NASA’s Webb An international research team will survey the stars, star clusters, and dust that lie within 19 nearby galaxies. Webb Telescope, Jan 19, 2022 <<Spirals are some of the most captivating shapes in the universe. They appear in intricate seashel...

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Chris Peterson wrote: ↑Tue Jan 18, 2022 8:32 pm
neufer wrote: ↑Tue Jan 18, 2022 8:25 pm
In any event, do you think that the illumination here is due to embedded T Tauri stars?
My guess is that the illumination here is external. Dust reflecting starlight.

Antares can barely light up its own local dust cloud: https://apod.nasa.gov/apod/ap190827.html

neufer

One of my absolutely favorite clusters is NGC 2362 in Canis Major, and I decided to find it in the full size version of the APOD. I think NGC 2362 has been doubled in today's APOD. factors of 2362 = 1, 2, and 1181 . [1+2+1181 = 1184] factors of 1184 = 1, 2, 4, 8, 16, 32, 37, 74, 148, 296, and 592 ....

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Interestingly, Andromeda is a ring galaxy rather than strictly a spiral galaxy: https://cdn.mos.cms.futurecdn.net/V8zUVrJpwM2G9CgN4dU5Eg-1024-80.jpg.webp https://upload.wikimedia.org/wikipedia/commons/2/2f/PIA20061_-_Andromeda_in_High-Energy_X-rays%2C_Figure_1.jpg :arrow: Curiously, the inner skewe...

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<<A materials recovery facility, materials reclamation facility, materials recycling facility or Multi re-use facility (MRF, pronounced "murf") is a specialized plant that receives, separates and prepares recyclable materials for marketing to end-user manufacturers. In the United States, ...

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So is this near-IR APOD image allowing us to detect scattered near-IR light from cool but luminous internal T Tauri stars :?: This was imaged through (presumably) conventional LRGB filters, which block near-IR which would otherwise mess up "natural" colors. I don't think there's any IR be...

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The Earth radiates ~10 micrometers. I would imagine that the dust here is much cooler than the Earth. https://apod.nasa.gov/apod/ap090715.html According to Wien's Law , stuff at 300 K has a black body radiation spectrum with a peak at 2898 μm⋅K / 300 K = 9.66 μm (micrometers), which is in the IR. S...

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https://www.youtube.com/watch?v=Bkac679n-fM <<In 1979 the importance of Bombo Quarry's geological features was brought to the New South Wales Heritage Council's attention. The quarry was owned by the Metropolitan Water, Sewerage and Drainage Board and it was proposed that a pollution control plant ...

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Officially, the bottom half is catalogued as the Chamaeleon III cloud and part of the Chamaeleon II cloud is in the upper half. Also Thumbprint Nebula is scientifically recognised. :D It is worth reading this ! Me thinks that Chamaeleon I should be the REAL Thumbprint Nebula: <<"Chamaeleon III...

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I take it to mean that we're seeing the light reflected from the dust, unlike the usual case where we simply see the dust indirectly by the background light it blocks. At these wavelengths, we're certainly not seeing any radiation emitted by the dust. Nor do I think we're seeing any near-IR, as all...

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great explanation in the second link, very clear. Thank you guys, I learned something new! One interesting question that remains is what are the timescales for this kinda circularization. Life could arise on a Europa-like world only to be frozen solid a few hundred million years later. Like it says...

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https://www.youtube.com/watch?v=08UlpJBt5Ic https://upload.wikimedia.org/wikipedia/commons/a/a1/Chamaeleo_chamaeleon_Frightened_thus_black.JPG <<The Local Bubble, or Local Cavity, is a relative cavity in the interstellar medium (ISM) of the Orion Arm in the Milky Way. It contains the closest of cel...

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hmm, but here it says the orbit approaches circular as time goes by :? It does indeed say that... and it makes no sense to me. :roll: This link has a huge bunch of math which is too deep for me, but maybe not for you - http://astro.pas.rochester.edu/~aquillen/ast233/lectures/H_Tidal.key.pdf Startin...

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To follow up johnnydeep's question: I imagine the amount of energy needed to heat an entire planet's worth of ice to melt should be quite substantial. Does it noticeably alter Europa's orbit? Shouldn't it be decaying? The standard rule of thumb is that a moon (like our own) that orbits a planet slo...

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Half an inch, half an inch, Half an inch onward, All into the valley of L2 Rode the JWST. Mirror Segment Deployment Tracker << This image tracks the progress of the individual primary mirror segments (A,B,C) and the secondary (SM) mirror as they move upward 12.5mm from their stowed launch position ...

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Click to play embedded YouTube video.

heehaw wrote: ↑Sun Jan 16, 2022 4:25 pm
It is really tremendous for us astronomers to have a really close-up look at an actual planet! Complex and interesting!

neufer

To follow up johnnydeep's question: I imagine the amount of energy needed to heat an entire planet's worth of ice to melt should be quite substantial. Does it noticeably alter Europa's orbit? Shouldn't it be decaying? The standard rule of thumb is that a moon (like our own) that orbits a planet slo...

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Hmmm! I wonder what that Europan shrimp would taste like? As decapods, Europan shrimp can probably count to ten. However, as prey to cephalopods (and Forest Gump) they will never be the most intelligent of species. https://www.youtube.com/watch?v=lNGnrO3thMY <<The Decapoda or decapods (literally &q...

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Doesn’t redshift have some inherent flaws ? :? It may be the best tool in the box but all devices usually have some practical limitations. :| Using just wave lengths can be tricky . :wink: Interesting things to contemplate. (Also: http://asterisk.apod.com/viewtopic.php?f=31&t=42158) However, I ...

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Ann, your Flying Spaghetti Monster reminded me of last night's Nature . :lol2: That show came to mind for me as well. It made be think that any planet with life was bound to have predators & prey and that eventually some those predators would have to become super intelligent. They only have to ...

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https://www.youtube.com/watch?v=wL2fRBv4GxY https://upload.wikimedia.org/wikipedia/commons/2/26/AldusManutius.jpg https://upload.wikimedia.org/wikipedia/commons/6/61/Sig05-013.jpg << Festina lente is a classical adage and oxymoron meaning "make haste slowly" (sometimes rendered in English...

Starship Asterisk*

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