[HN Gopher] Preliminary analysis of the Hayabusa2 samples return...
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Preliminary analysis of the Hayabusa2 samples returned from
asteroid Ryugu
Author : robin_reala
Score : 102 points
Date : 2022-01-02 16:25 UTC (6 hours ago)
(HTM) web link (www.nature.com)
(TXT) w3m dump (www.nature.com)
| bubblehack3r wrote:
| Tl;dr?
| adolph wrote:
| Picture is here (from last year):
| https://www.nature.com/articles/s41550-021-01585-9
|
| Looks a little like coffee grounds in a grinder, only if you
| ground charcoal.
| herodotus wrote:
| As far as I can tell: (1) Yes indeed, the composition of the
| samples was not degraded when they were collected and returned
| to earth. (2) The samples indicate that Ryugu is similar to Cl
| chondrites (break up easily when entering earth, therefore only
| small fragments collected on earth; rich in volatile elements,
| representative of the chemical composition of our solar system)
| BUT Ryugu is less reflective, more porous and more fragile even
| than Cl chondrites.
|
| Therefore (in my non-expert opinion): well worth the effort to
| collect and study because we will never find anything similar
| from a Meteor so these samples will give us much more evidence
| about the solar system's chemical composition.
| robin_reala wrote:
| In scientific papers the bit headed Abstract is basically the
| tl;dr, you can skip the rest.
| ncmncm wrote:
| In typical papers, what the abstract says contradicts what
| the graphs say, and what the conclusion says; and the graphs
| contradict the conclusion.
|
| Papers where they all match are exceptional and precious. But
| we cannot trust that just any paper is among them, even those
| published in Nature.
| z3t4 wrote:
| It's fascinating that the death of a star can bring life.
| Basically when a star dies there will be a lot of carbon, oxygen
| and hydrogen - the building blocks for life, and there are a lot
| of dead star remains floating around in space. It's almost like
| if the whole big bang process was made in order to create life.
| pault wrote:
| Maybe life is just an efficient way to increase entropy and
| thus it will arise wherever the requisite conditions are
| available.
| tgv wrote:
| I think the phrase "on-asteroid measurements" can already lay
| claim to the title "concise understatement of the year".
| gitgrump wrote:
| Seriously. Humans managed to send a robot to a rock hurtling
| through the universe, and then took pieces back to look at. And
| it feels so normal! This is awesome stuff.
| ianai wrote:
| As someone keyed into this stuff, it doesn't feel so normal
| to me. Feels pretty momentous!
| gitgrump wrote:
| Oh, momentous for sure! I guess I meant that it's not
| surprising that we were able to do it successfully. "What,
| like it's hard?" vibes. :)
| pmayrgundter wrote:
| Just reading up on Hayabusa and Hayabusa2, and the NASA's OSIRIS-
| REx. They all targeted large (~1km) Apollo group asteroids
| (Itokawa, Ryugu, Bennu respectively).
|
| The asteroid that has had the highest probability of collision
| with Earth (1950 DA) was also an ~1km Apollo group asteroid, and
| Apollo asteroids are the source of almost all of the known
| Potentially Hazardous Objects for Earth.
|
| The stated objectives for these missions is basic science, such
| as understanding the proto-planetary conditions of our solar
| system. That makes sense and also near-Earth asteroids are
| practical targets for missions!
|
| But it seems likely to me that someone is also building profiles
| for interception, should we need it. So it's curious that hazard
| profiling isn't mentioned in the objectives for these missions
| (not that I can find.. correction appreciated!) That makes me
| wonder if there's something else out there not being talked
| about. And Osiris Rex would be King God of the Dead... _shrug_ ,
| nothing to see here ;)
|
| https://en.wikipedia.org/wiki/Hayabusa
| https://en.wikipedia.org/wiki/Hayabusa2
| https://en.wikipedia.org/wiki/OSIRIS-REx
| https://en.wikipedia.org/wiki/Apollo_asteroid
| https://en.wikipedia.org/wiki/25143_Itokawa
| https://en.wikipedia.org/wiki/162173_Ryugu
| https://en.wikipedia.org/wiki/101955_Bennu
| https://en.wikipedia.org/wiki/(29075)_1950_DA
| https://en.wikipedia.org/wiki/Potentially_hazardous_object#L...
| https://www.minorplanetcenter.net/iau/lists/PHACloseApp.html
| https://www.isas.jaxa.jp/e/snews/2006/0602.shtml
| czbond wrote:
| We'd better figure out Apophis in the next 100 years...
| [deleted]
| CrazyCatDog wrote:
| I found the bit about whether the samples may have been altered
| in final transit interesting as well as the artificial crater
| created by landing--the rest, per my layman eye, is effectively
| reporting means, nothing interesting yet...
| rurban wrote:
| I find it extremely interesting that all remote sensing
| analysis was confirmed by onsite analysis. That means we can
| trust our remote sensing capabilities.
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(page generated 2022-01-02 23:00 UTC)