Ancient precision

[freebeard]

Nothing in your list precludes the phenomenom. 1) defines it away.

What are Main Sequence Stars? - Universe, Guide
https://www.universeguide.com › fact › mainsequencestars
A star will spend 90% of its life in the main sequence. When a star leaves the main sequence stage, it will can go supernova and become a black hole or a neutron star. At this stage, existence will not be over just yet as it will continue to glow/exist for a lot longer than it was in the main sequence.

The classic scenario of feeding off a binary star companion is being extended to dust swept up from the interstellar medium.

[oil pan 4]

Red dwarf or red giant?

[freebeard]

Spectroscopic observation of nova ejecta nebulae has shown that they are enriched in elements such as helium, carbon, nitrogen, oxygen, neon, and magnesium.[2] The contribution of novae to the interstellar medium is not great; novae supply only 1⁄50 as much material to the Galaxy as do supernovae, and only 1⁄200 as much as red giant and supergiant stars.[2]

en.wikipedia.org/wiki/Nova#Occurrence_rate_and_astrophysical_significanc e

There are world's of opportunity for events between a Coronal Mass Ejection and a Nova. And at least two probable causes.

[Piotrsko]

Originally Posted by oil pan 4

No one expected ancient people like that to be this capable.

"Necessity is a Mother"* Frank Zappa

[aerohead]

Originally Posted by freebeard

Nothing in your list precludes the phenomenom. 1) defines it away.



The classic scenario of feeding off a binary star companion is being extended to dust swept up from the interstellar medium.

1) my source is Howard E. Bond, Space Telescope Science Institute, Baltimore, MD, and Proceedings of the Frascati Workshop, Vulcan Island, Astrophysics and Space Science Library, aimed at a specialist audience.
2) the Sun is a main sequence star, not a binary, not a supermassive.
3) the Sun is held together by hydrostatic equilibrium.
4) nearing the end of its life, the Sun will experience expansion into a distended asymtotic-giant branch ( AGB ) star, in about 5-billion years.
5) the Sun will suddenly eject its outer layers, evolving into a proto-planetary-nebula phase.
6) the Sun's remnant core will rapidly evolve to very high surface temperature, emitting such intense UV radiation that the ejected envelope will heat to flourescence, producing a planetary nebula ( PN ).
7) as of 1989, there were 1250 known PN in the Milky Way.
8) a main sequence star remnant core is of such insufficient mass that it cannot become a neutron star or a black hole.
9) Perhaps S-O has mentioned the Russell-Vogt Theorem of mass-equilibrium limit.

[aerohead]

Originally Posted by oil pan 4

Red dwarf or red giant?

Technically, is will be a planetary nebula.

[aerohead]

And the necessity of invention is a mutha-

[aerohead]

Originally Posted by freebeard

en.wikipedia.org/wiki/Nova#Occurrence_rate_and_astrophysical_significanc e

There are world's of opportunity for events between a Coronal Mass Ejection and a Nova. And at least two probable causes.

I'm not seeing anything in the solar physics literature which implies that we could expect any remarkable activity of of our Sun in the next 5-billion years.

[freebeard]

As a sanity check, does your 'the solar physics literature' comment on the Charlemagne Event?

phys.org: Researcher points to Sun as likely source of eighth-century 'Charlemagne event'

In addition, Melott noted that recent observations of stars similar to the Sun made by the Kepler satellite suggest that they are flaring at levels similar to that which they suggest—and higher—at average intervals of a few hundred to thousand years.

[aerohead]

Originally Posted by freebeard

As a sanity check, does your 'the solar physics literature' comment on the Charlemagne Event?

phys.org: Researcher points to Sun as likely source of eighth-century 'Charlemagne event'

* Sounds like it wasn't much of an event.
* Your friends at University of Illinois, Champagne-Urbana told us that for a supernova to hurt us, it would have to be within 25 light years, unless jets were perfectly aligned. If so, we'd be looking for either a neutron star or black hole remnant within 25 light years.
* University of Kansas has mentioned solar storms of 1928, 1946, and 1972.
*At home I've got some stuff on high-latitude events in Canada, where 6-million lost power, transformers exploded, satellites experienced space drag which degraded their orbits, ect..
* Also, NASA monitors solar flares for gamma-rays, so its looks like that can be a 'thing.'
* NASA also says that solar flares can not automatically be associated with solar storms, as it all has to do with alignments and intersects, neither of which can be predicted.