Starship Asterisk*

Chris Peterson wrote: ↑Mon Nov 25, 2019 11:43 pm

ta152h0 wrote: ↑Mon Nov 25, 2019 11:34 pm Is this the area where there's a contact binary that's supposed to go supernova in 5 years or less?

KIC 9832227. It's in the same constellation (Cygnus), but farther away than the Veil.

Chris Peterson wrote: ↑Mon Nov 25, 2019 11:43 pmAlso, when the two stars merge they will only produce a nova, not a supernova. And it turns out there are some problems with the predicted timing. So, probably no merger anytime soon ("soon" by our standards).

ta152h0 wrote: ↑Mon Nov 25, 2019 11:34 pm Is this the area where there's a contact binary that's supposed to go supernova in 5 years or less?

TheOtherBruce wrote: ↑Mon Nov 25, 2019 5:54 pm

MarkBour wrote: ↑Mon Nov 25, 2019 4:56 pm
Actually, I first wonder what the density of the gasses are; it all may be quite tenuous, even in those spots

It is — the density even in the brighter patches isn't actually much more than the average near-vacuum you'd find in interstellar space. The main reasons we can see these nebulae at all is partly due to UV and visible light from nearby stars ionising the gas, partly (in this case) the high-speed debris from the supernova piling into surrounding gas and dust clouds, usually heating them to ridiculous temperatures.

https://en.wikipedia.org/wiki/Supernova_remnant wrote:

Click to play embedded YouTube video.

A supernova remnant (SNR) passes through the following stages:

• Free expansion of the ejecta, until they sweep up their own weight in circumstellar or interstellar medium. This can last tens to a few hundred years depending on the density of the surrounding gas.
  
  Sweeping up of a shell of shocked circumstellar and interstellar gas. Strong X-ray emission traces the strong shock waves and hot shocked gas.
  
  Cooling of the shell, to form a thin (< 1 pc), dense (1-100 million atoms per cubic metre) shell surrounding the hot (few million kelvin) interior. This is the pressure-driven snowplow phase. The shell can be clearly seen in optical emission from recombining ionized hydrogen and ionized oxygen atoms.
  
  Cooling of the interior. The dense shell continues to expand from its own momentum. This stage is best seen in the radio emission from neutral hydrogen atoms.
  
  Merging with the surrounding interstellar medium. When the supernova remnant slows to the speed of the random velocities in the surrounding medium, after roughly 30,000 years, it will merge into the general turbulent flow, contributing its remaining kinetic energy to the turbulence.

MarkBour wrote: ↑Mon Nov 25, 2019 4:56 pm Actually, I first wonder what the density of the gasses are; it all may be quite tenuous, even in those spots

orin stepanek wrote: ↑Mon Nov 25, 2019 2:57 pm I'm Not hep on Trig; so I'll hope it wasn't an insult! as you can see by my question that I thought it was 12 Light across! All I wanted was clarification!

https://www.youtube.com/watch?v=hiaVJp1ZISs wrote:

Click to play embedded YouTube video.

<<Angel Bat Dawid performs her own song We are Starzz.

Composer, clarinetist, singer & spiritual jazz soothsayer Angel Bat Dawid descended on Chicago's jazz & improvised music scene just a few years ago. In very short time, the potency, prowess, spirit & charisma of her cosmic musical proselytizing has taken her from relatively unknown improviser to borderline ubiquitous performer in Chicago's avant-garde.

This video was recorded in the garden of the Nutshuis in The Hague during Rewire Festival for VPRO Vrije Geluiden: music program made by the Dutch public broadcast organization VPRO.>>

orin stepanek wrote: ↑Mon Nov 25, 2019 12:31 pm OK, I'm confused! :? Which is it? 12 light years or 14,000 light years distant!

That translates to 12 light-years at the Veil's estimated distance, a reassuring 1,400 light-years from planet Earth.

Or does that mean that the Veil is 12 light years across? :!:

That translates to 12 light-years at the Veil's estimated distance, a reassuring 1,400 light-years from planet Earth.