[HN Gopher] Deep Space Trajectories: Exiting the Heliosphere
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Deep Space Trajectories: Exiting the Heliosphere
Author : well_i_never
Score : 46 points
Date : 2024-04-20 20:07 UTC (2 days ago)
(HTM) web link (www.centauri-dreams.org)
(TXT) w3m dump (www.centauri-dreams.org)
| kibwen wrote:
| That image showing the potential shape of the heliosphere is very
| interesting, I wonder how it's possible for those weird cutout
| shapes to form in the heliosphere's tail.
|
| Also, this is wild:
|
| _> Along the evolutionary path, high interstellar cloud
| densities and ionization fractions have likely compressed the
| heliosphere down to below 25 au... Evidence is emerging for
| supernovae explosions as recent as 3 million years ago at only
| 20-50 pc from the Sun that probably compressed the heliosphere
| even below the orbit of Saturn and perhaps more, exposing the
| terrestrial planets to almost the full force of interstellar
| material and GCRs_
| greenavocado wrote:
| I recently watched an interesting YouTube video which discusses
| potential disaster scenarios. The video itself rambles on and is
| difficult to follow but it raises some interesting points
| (https://www.youtube.com/watch?v=ihwoIlxHI3Q):
|
| The Earth's magnetic field is weakening at an accelerating rate,
| signaling an upcoming magnetic excursion or reversal event within
| the next few decades.
|
| This magnetic event is part of a recurring catastrophic cycle
| that happens roughly every 12,000 years and is triggered by the
| solar system's interaction with the galactic current sheet.
|
| The interaction with the galactic current sheet will cause a
| "micronova" event on the Sun, leading to massive solar eruptions
| and disruptions to the Earth's systems.
|
| Evidence for these recurring catastrophic events can be found in
| geological records, ancient stories and myths from around the
| world, and ongoing changes observed on other planets and nearby
| stars.
|
| The author suggests that the government and elites are aware of
| this impending disaster and are secretly preparing underground
| shelters and bunkers.
|
| The author encourages mental and practical preparedness for this
| event, including understanding local geography, resources, and
| potential safe locations.
|
| According to the author, the galactic current sheet causes the
| recurring catastrophic cycle on Earth by triggering a "micronova"
| event on the Sun. Specifically, the author argues that:
|
| - The solar system periodically passes through the high-density,
| dusty region of the galactic current sheet, which separates the
| north and south galactic magnetic fields.
|
| - When the Sun enters this galactic current sheet region, the
| combination of the high dust/gas density, reversed galactic
| magnetic fields, and additional energetic particles causes
| instability and disruption to the Sun.
|
| - This disruption from the galactic current sheet triggers rare,
| extremely powerful solar outbursts from the Sun, which the author
| refers to as a "micronova" event.
|
| - These "micronova" solar outbursts then impact the Earth,
| causing catastrophic effects like disrupting the boundary between
| the crust and mantle (the low velocity zone), inducing crustal
| displacement or rotation changes, generating intense cosmic ray
| bombardment, and potentially leading to climate changes and ice
| ages.
|
| So in the author's view, it is the periodic intersection of the
| solar system with the high-density, magnetically-reversed
| galactic current sheet that provides the trigger to set off the
| chain of events culminating in the catastrophic "micronova" solar
| outbursts that devastate the Earth on a roughly 12,000 year
| cycle.
| pfdietz wrote:
| > The interaction with the galactic current sheet will cause a
| "micronova" event on the Sun, leading to massive solar
| eruptions and disruptions to the Earth's systems.
|
| This sounds completely implausible.
| greenavocado wrote:
| Yeah, I don't really buy it either as the evidence is weak.
| The author does provide some references to some astronomers
| and physicists hypothesizing about past "immense solar
| outbursts" from the Sun, orders of magnitude more powerful
| than modern events but no specific observations or data are
| cited.
|
| There is also some discussion of "recurrent novae," faint and
| fast "dwarf novae," and simulations of triggering mechanisms
| that could produce nova-level energy releases from stars
| interacting with phenomena like interstellar dust clouds but
| I'm not sure if the scales of any of those match what the
| ancient peoples described or if the simulations results are
| even plausible.
|
| Still an interesting theory imo.
| GolfPopper wrote:
| Not quite the same thing, but Miyake events [1] are along
| the same lines; well-documented historical records of
| planet-wide radiation spikes that make the Carrington Event
| look like a walk in the park by comparison.
|
| 1. https://www.scientificamerican.com/article/mystery-of-
| ancien...
| pfdietz wrote:
| Are you sure you didn't read something from one of those
| Electric Sun cranks?
| marcosdumay wrote:
| As compared to the galaxy magnetic field inducing change on
| the Earth's?
|
| The entire thing is ridiculous.
|
| Oh, and that 12k year "geological cycle" (AKA random
| fluctuations that somebody got famous for mischaracterizing)
| is the weakest one without any visible consequences. The
| larger ones are much more interesting.
| JumpCrisscross wrote:
| > _that 12k year "geological cycle"_
|
| It's worse than that. The 12,000 years comes from "the
| duration of a full reversal" being "between 2,000 and
| 12,000 years" [1]. They took the duration of a phenomenon
| and mistook it for its frequency.
|
| [1]
| https://en.wikipedia.org/wiki/Geomagnetic_reversal#History
| pfdietz wrote:
| That's equally ludicrous, yes. I didn't read beyond those
| two.
| JumpCrisscross wrote:
| > _magnetic event is part of a recurring catastrophic cycle
| that happens roughly every 12,000 years_
|
| It's not catastrophic unless you're a computer orbiting near
| the magnetopause, and it happens "on average once every
| ~450,000 years" [1].
|
| > _ancient stories and myths from around the world_
|
| The last reversal occured 780,000 years ago. The author is
| claiming million-year old myths.
|
| > _the north and south galactic magnetic fields_
|
| This isn't a thing [2].
|
| > _author suggests that the government and elites are aware of
| this impending disaster and are secretly preparing underground
| shelters and bunkers_
|
| Why would you keep watching...
|
| [1]
| https://en.wikipedia.org/wiki/Geomagnetic_reversal#Effects_o...
|
| [2] https://www.wtamu.edu/~cbaird/sq/2014/09/03/why-dont-
| galaxie...
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