[HN Gopher] The Dawn of a New Era for Supernova 1987a (2017)
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The Dawn of a New Era for Supernova 1987a (2017)
Author : raattgift
Score : 117 points
Date : 2024-10-22 23:09 UTC (23 hours ago)
(HTM) web link (science.nasa.gov)
(TXT) w3m dump (science.nasa.gov)
| jb1991 wrote:
| Needs (2017) on title.
| elhospitaler wrote:
| That time-lapse video is insane!
| raverbashing wrote:
| This has been one material that has taught me a lot about SN1987A
| (a recreation of live events of when it happened, it used to be a
| twitter acct but now it is archived
| https://bmonreal.github.io/RealTime1987A/ )
| ucsbphysics wrote:
| yes! cool to see a ben monreal mention too, he taught me intro
| and nuclear physics once upon a time.
| empiricus wrote:
| I am wondering which visible cosmic events are actually some
| alien constructs.
| m463 wrote:
| or ... destructs
| GJim wrote:
| Arthur C Clarke once suggested some supernova may be industrial
| accidents.
|
| It's a strangely romantic idea and one that is Clarke through
| and through!
| tristramb wrote:
| In Alastair Reynolds' "House of Suns", the Gentian Line of
| spacefarers construct "stardams" around stars to prevent
| their supernova outbursts from harming nearby civilizations.
| sandworm101 wrote:
| Given the amount of empty space out there, the amount of
| black between stars, it would seem more efficient to create
| shields around the civilizations than around the stars
| themselves.
| restalis wrote:
| "Efficient" in the economical sense, that is. Unless, the
| civilization covers a very wide area (basically
| everywhere in there, for light years around the impending
| supernova) and the protection amounted for each and every
| civilization zone would surpass the containment
| circle/cylinder/sphere around the star. In such case the
| sensible solution becomes to just recognize the area that
| can not be saved (no mater what) due to its proximity to
| the star and the limits of walling withstanding capacity,
| evacuate that, and set the containment all around the
| future explosion as close as possible instead.
| woolcap wrote:
| Brings new meaning and scale to the idea of a RUD.
| dotancohen wrote:
| Bridges nicely with the Asimov story of a civilization that
| prepares for its supernova by constructing a monument to
| survive it.
| acheron wrote:
| That was a Clarke story too, at least the one I remember:
| https://en.wikipedia.org/wiki/The_Star_(Clarke_short_story)
|
| I don't remember an Asimov one, but maybe he did one too;
| he wrote a whole lot of stories and I certainly haven't
| read all of them.
| dotancohen wrote:
| Yes, that's the story.
|
| I probably read it three or four decades ago, along with
| others by those two authors and Heinlein as well. Easily
| confused, as I now live with a dog named Asimov!
| svieira wrote:
| This kind of "things we think are natural are actually the
| product of intelligences much larger than we currently can
| imagine" is all throughout John C. Wright's "Count to the
| Eschaton" sequence as well.
| yread wrote:
| This is how jwst sees it
| https://science.nasa.gov/missions/webb/webb-finds-evidence-f...
| baq wrote:
| the NIRCam image without markings:
| https://esawebb.org/images/SN1987a-1/
| Grandeculio wrote:
| The next step is to find evidence of a neutron star or black hole
| left behind.
| sirto wrote:
| They possibly already found a neutron star inside the remains:
| https://science.nasa.gov/missions/webb/webb-finds-evidence-f...
| xeyownt wrote:
| This is clearly one supernova to rule them all!
| pohl wrote:
| What are some thoughts about why we're basically seeing a flat
| ring, rather than a spherical shell of a cloud in all directions?
| readyplayernull wrote:
| High speed rotation in an axis?
| ASalazarMX wrote:
| According to this article, this explosion is hourglass-shaped
| rather than spherical, due to the previous behavior of the
| star.
|
| https://www.astronomy.com/science/why-does-supernova-1987a-l...
| jdhwosnhw wrote:
| The column mass (ie, the spatial density multiplied by the
| length of the observer's line of sight through the material) is
| highest at the limbs when looking at a gaseous shell. So shells
| like this look like rings from all angles. A related effect
| called limb darkening is the edges of the sun always look less
| bright, independent of viewing angle
| alfiopuglisi wrote:
| The ring is not a product of the supernova. It's pre-existing
| material, that is being energized by impact of the supernova
| ejecta (it took a few months for it to start brightening).
|
| There are actually three rings, a smaller one around the
| previous star's equator, and two larger ones above and below.
| The hourglass-like figure is actually quite common, produced by
| the star rotaton.
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