Register Register

Author Topic: Deep Space and Interplanetary Exploration - The Universe is Timeless  (Read 71720 times)

rebs

  • Lieutenant Colonel
  • *
  • Posts: 7704
  • Running circles around the competition...
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1380 on: 03 August 2019, 17:35:45 »
I've been skeptical of the dark matter theories since they came out.  I think we're just missing something less mysterious, probably due to insufficient detection technology.

I knew a fellow who did his masters thesis on dark matter.  When I asked him what is dark matter, he said the best answer to that question is "don't know".  He was at least kind enough and ego-less enough to admit that that answer is the consensus of all the scientists and researchers he knew.

Sabelkatten

  • Major
  • *
  • Posts: 5111
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1381 on: 03 August 2019, 18:17:57 »
Pretty much everything I've read on dark matters can be summed up as "It looks like there's more matter than we can see, but we have no idea what it is and/or if our theories are correct".

Wrangler

  • Colonel
  • *
  • Posts: 16716
  • Dang it!
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1382 on: 08 August 2019, 11:29:56 »
Legacy of the failed Beresheet lander continues. Phg.org reports that there high-likeliness that the microscopic animals carried as part experiment on the lander could survived and lived after impact.  The Tardigrades, better known as water bears.  were onboard as part experiment see if they could survive the extreme conditions on the Moon.  They are known to be one toughs life forms on Earth, scientist predict the  Tardigrades carried on the doom lander properly survived.  Its suspected they won't be really active due to the limited basic resources they need, aka water among other things.
"Men, fetch the Urbanmechs.  We have an interrogation to attend to." - jklantern
"How do you defeat a Dragau? Shoot the damn thing. Lots." - Jellico 
"No, it's a "Most Awesome Blues Brothers scene Reenactment EVER" waiting to happen." VotW Destrier - Weirdo  
"It's 200 LY to Sian, we got a full load of shells, a half a platoon of Grenadiers, it's exploding outside, and we're wearing flak jackets." VoTW Destrier - Misterpants

kato

  • Captain
  • *
  • Posts: 1700
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1383 on: 08 August 2019, 14:07:29 »
"The Comet"

https://vimeo.com/347565673

Short movie entirely generated from 400,000 pictures taken by Rosetta.

Daryk

  • Lieutenant Colonel
  • *
  • Posts: 10140
  • The Double Deuce II/II-σ
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1384 on: 08 August 2019, 17:59:40 »
Beautiful!  And amazing!!  :thumbsup:

kato

  • Captain
  • *
  • Posts: 1700
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1385 on: 22 August 2019, 18:55:34 »
The boulders in the crater carved out of Ryugu by Hayabusa 2 using its SCI heavy projectile have been named:



Iijima was moved by the explosion. For scale: The two rings are about 4 meters apart between Okamoto and Onigiri.

The above image was taken during the second sampling when Hayabusa 2 descended to "touchdown altitude" a few meters outside the crater to scoop up material thrown up by the explosion.

Sped-up timelapse video of the touchdown (at 10x speed): http://www.hayabusa2.jaxa.jp/topics/20190726_TD2_images/img/CAMH_PPTD_Timelapse_full_x10.mp4


MASCOT's location on Ryugu is about 300 meters behind Onigiri from this view. Minerva-II-1A/B is on the opposite side of the asteroid. The two Minerva-II-1A/B rovers seem to be active again (dropped 10 months ago!), they were in hibernation while Ryugu was further away from the sun in spring.

Hayabusa 2 still carries three target markers and the single Minerva-II-2 rover. It's planned to release the rover from high altitude (1 km) in order to measure the gravity field of the asteroid during its descent. After release Hayabusa 2 would return to 20 km default altitude to observe the descent. As a rehearsal for the flight mechanics of this drop they will first try it in early September with two of the target markers which aren't needed anymore.

Hayabusa 2 is planned to leave Ryugu in November or December this year to deliver its samples back to Earth. JAXA is currently in the process of applying for a landing permit in Woomera, Australia for the reentry capsule.

Daryk

  • Lieutenant Colonel
  • *
  • Posts: 10140
  • The Double Deuce II/II-σ
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1386 on: 22 August 2019, 19:57:10 »
Cool video!  Thanks for sharing!  :thumbsup:

ANS Kamas P81

  • Lieutenant Colonel
  • *
  • Posts: 9839
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1387 on: 25 August 2019, 01:21:33 »
Burp.

https://www.cnn.com/2019/08/20/world/black-hole-neutron-star-scn-trnd/index.html

That said the point about light black holes, under five stellar masses, poses a question.  Hawking radiation is assumed to be correct, therefore black holes do evaporate slowly over time. What if a small black hole spent a few billion years slowly leaking said radiation, losing mass, and finally falling below the formation limit of a stellar black hole?  Does it still remain what it is, or does something weird happen?  (I assume it does remain)

Daryk

  • Lieutenant Colonel
  • *
  • Posts: 10140
  • The Double Deuce II/II-σ
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1388 on: 25 August 2019, 04:23:03 »
The Economist's article on the subject was a bit more detailed, and went into the "gray area" between black holes and neutron stars.  That's what has astrophysicists excited.  Here's the link: https://www.economist.com/science-and-technology/2019/08/22/gravitational-astronomy-proves-its-maturity

worktroll

  • Ombudsman
  • Colonel
  • *
  • Posts: 20636
  • 504th "Gateway" Division
    • There are Monsters in my Sky!
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1389 on: 25 August 2019, 05:10:23 »
Given the standard model of Hawking radiation, the black hole keeps evaporating, faster & faster as it's mass falls. Eventually there's be a blaze of energy as the remaining mass converts to energy in the last seconds. At that point, the mass, charge, and rotation of the black hole are gone ... leaving only the singularity. No longer decently clothed by an event horizon. This, in the Standard Model, is a Bad Thing.

Do some looking up on Plank Stars - an alternative to the classical Black Hole theory which prevents the formation of the singularity. This makes things considerably neater, including addressing & resolving the Information Loss paradox (also qv.). Unfortunately hard to do experiments to falsify or validate the hypothesis.
* No, FASA wasn't big on errata - ColBosch
* The Housebook series is from the 80's and is the foundation of Btech, the 80's heart wrapped in heavy metal that beats to this day - Sigma
* To sum it up: FASAnomics: By Cthulhu, for Cthulhu - Moonsword
* Because Battletech is a conspiracy by Habsburg & Bourbon pretenders - MadCapellan
* The Hellbringer is cool, either way. It's not cool because it's bad, it's cool because it's bad with balls - Nightsky
* It was a glorious time for people who felt that we didn't have enough Marauder variants - HABeas2, re "Empires Aflame"

Daryk

  • Lieutenant Colonel
  • *
  • Posts: 10140
  • The Double Deuce II/II-σ
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1390 on: 25 August 2019, 05:15:40 »
You might have better luck searching for Planck Stars, but they do look interesting!

worktroll

  • Ombudsman
  • Colonel
  • *
  • Posts: 20636
  • 504th "Gateway" Division
    • There are Monsters in my Sky!
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1391 on: 25 August 2019, 05:17:06 »
Sorry, I was board ...
* No, FASA wasn't big on errata - ColBosch
* The Housebook series is from the 80's and is the foundation of Btech, the 80's heart wrapped in heavy metal that beats to this day - Sigma
* To sum it up: FASAnomics: By Cthulhu, for Cthulhu - Moonsword
* Because Battletech is a conspiracy by Habsburg & Bourbon pretenders - MadCapellan
* The Hellbringer is cool, either way. It's not cool because it's bad, it's cool because it's bad with balls - Nightsky
* It was a glorious time for people who felt that we didn't have enough Marauder variants - HABeas2, re "Empires Aflame"

Daryk

  • Lieutenant Colonel
  • *
  • Posts: 10140
  • The Double Deuce II/II-σ
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1392 on: 25 August 2019, 05:21:07 »
LOL!  ;D

worktroll

  • Ombudsman
  • Colonel
  • *
  • Posts: 20636
  • 504th "Gateway" Division
    • There are Monsters in my Sky!
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1393 on: 25 August 2019, 05:23:25 »
I just like the economy involved in the PlanCk star theory.
* No, FASA wasn't big on errata - ColBosch
* The Housebook series is from the 80's and is the foundation of Btech, the 80's heart wrapped in heavy metal that beats to this day - Sigma
* To sum it up: FASAnomics: By Cthulhu, for Cthulhu - Moonsword
* Because Battletech is a conspiracy by Habsburg & Bourbon pretenders - MadCapellan
* The Hellbringer is cool, either way. It's not cool because it's bad, it's cool because it's bad with balls - Nightsky
* It was a glorious time for people who felt that we didn't have enough Marauder variants - HABeas2, re "Empires Aflame"

ANS Kamas P81

  • Lieutenant Colonel
  • *
  • Posts: 9839
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1394 on: 25 August 2019, 10:41:44 »
Plank stars certainly wood be an interesting thing to study, though with the recent imaging of both Sag A* and the extragalactic SMBH and only seeing the accretion disc and a clearly defined inner edge of it of straight black.  So I'd say event horizons, at least, are a thing...though apparently (according to Wikipedia) the universe itself isn't old enough for the rebound of a Planck star to make itself visible yet.

Neat idea though.

Wrangler

  • Colonel
  • *
  • Posts: 16716
  • Dang it!
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1395 on: 29 August 2019, 12:14:51 »
Minor rocketry news, the Star Hopper has successfully launched and did it's 150 meter flight without a hitch.

Their talking about retiring the ship, so they can scavenge parts from it for the Mk1 Starship their building next on their  development for the Starship/Super Heavy series.

Here the link to the vid posted on youtube.



The hopper sort looks like stubby DropShip prototype in a way.

« Last Edit: 30 August 2019, 19:30:18 by Wrangler »
"Men, fetch the Urbanmechs.  We have an interrogation to attend to." - jklantern
"How do you defeat a Dragau? Shoot the damn thing. Lots." - Jellico 
"No, it's a "Most Awesome Blues Brothers scene Reenactment EVER" waiting to happen." VotW Destrier - Weirdo  
"It's 200 LY to Sian, we got a full load of shells, a half a platoon of Grenadiers, it's exploding outside, and we're wearing flak jackets." VoTW Destrier - Misterpants

kato

  • Captain
  • *
  • Posts: 1700
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1396 on: 29 August 2019, 14:02:03 »
Wasn't it supposed to do 200m altitude in that hop?

Sabelkatten

  • Major
  • *
  • Posts: 5111
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1397 on: 29 August 2019, 14:04:36 »
I watched Scott Manley's commentary on the Hopper and he noticed the same thing I did; Shortly before landing it looks like something breaks off in the engine, you can see a small burning object go flying out the exhaust and then it changes from a clear blue flame to, well, fire... :(

Wasn't it supposed to do 200m altitude in that hop?
Apparently the FAA only allowed 150m.

Cache

  • Captain
  • *
  • Posts: 2022
    • Lords of the Battlefield
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1398 on: 29 August 2019, 19:24:37 »
The hopper sort looks like stubby DropShip prototype in a way.
Manatee

Daryk

  • Lieutenant Colonel
  • *
  • Posts: 10140
  • The Double Deuce II/II-σ
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1399 on: 29 August 2019, 19:43:28 »
Prototype of a Manatee, sure... the legs stick about a bit much, though...

truetanker

  • Major
  • *
  • Posts: 6302
  • Clan Hells Horses 666th Mech. Assualt Cluster
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1400 on: 29 August 2019, 20:54:13 »
Hey we funded Clan Invasion for what again? 2.5 Million right...

https://www.cnet.com/news/nasa-is-giving-away-a-free-apollo-era-saturn-rocket/

They want 250, 000 .00 for it...

* Pow! * to the Moon baby?  :thumbsup:

TT
Khan, Clan Iron Dolphin
Azeroth Pocketverse
That is, if true tanker doesn't beat me to it. He makes truly evil units.Col.Hengist on 31 May 2013
TT, we know you are the master of nasty  O0 ~ Fletch on 22 June 2013
If I'm attacking you, conventional wisom says to bring 3x your force.  I want extra insurance, so I'll bring 4 for every 1 of what you have :D ~ Tai Dai Cultist on 21 April 2016
Me: Would you rather fight my Epithymía Thanátou from the Whispers of Blake?
Nav_Alpha: That THING... that is horrid
~ Nav_Alpha on 10 October 2016

ANS Kamas P81

  • Lieutenant Colonel
  • *
  • Posts: 9839
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1401 on: 29 August 2019, 22:18:57 »
Hey we funded Clan Invasion for what again? 2.5 Million right...

https://www.cnet.com/news/nasa-is-giving-away-a-free-apollo-era-saturn-rocket/

They want 250, 000 .00 for it...

* Pow! * to the Moon baby?  :thumbsup:

TT
Moon hell, think commercial: now we won't need a distribution center in Australia; there's way more than enough mass budget there to put their orders onboard and ship them out faster than ordering a pizza!

ANS Kamas P81

  • Lieutenant Colonel
  • *
  • Posts: 9839
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1402 on: 30 August 2019, 22:31:59 »
We have an official Code WTF from the moon.

https://www.space.com/china-far-side-moon-rover-strange-substance.html

China just canceled all planned science missions for the Chang'e mission's Yutu-2 rover on the far side of the moon, after spotting something curious in a nearby crater - and finding a strangely colored "gel-like substance" in said crater.  It's investigating now, and the science teams are 100% focused on figuring out just what this substance is.  No further word available yet.

COULD just be melt-glass from an impact, but a: that doesn't fit "gel" in my opinion (unless it's got a melt-point near 120C, surface daylight temperature) and b: you'd expect to see impact glass all over the place in small craters, so it shouldn't be weird enough to throw out the schedule and focus everything the team has on it.

Maybe it is just that, and a big overreaction in their space program, but then again...maybe something weird just happened.
« Last Edit: 30 August 2019, 22:35:36 by ANS Kamas P81 »

Wrangler

  • Colonel
  • *
  • Posts: 16716
  • Dang it!
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1403 on: 30 August 2019, 22:37:41 »
Maybe they found this on the far-side of the moon...

"Men, fetch the Urbanmechs.  We have an interrogation to attend to." - jklantern
"How do you defeat a Dragau? Shoot the damn thing. Lots." - Jellico 
"No, it's a "Most Awesome Blues Brothers scene Reenactment EVER" waiting to happen." VotW Destrier - Weirdo  
"It's 200 LY to Sian, we got a full load of shells, a half a platoon of Grenadiers, it's exploding outside, and we're wearing flak jackets." VoTW Destrier - Misterpants

ANS Kamas P81

  • Lieutenant Colonel
  • *
  • Posts: 9839
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1404 on: 30 August 2019, 22:40:00 »
Maybe they found this on the far-side of the moon...


Ogra_Chief

  • Master Sergeant
  • *
  • Posts: 264
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1405 on: 31 August 2019, 00:51:41 »
We have an official Code WTF from the moon.

https://www.space.com/china-far-side-moon-rover-strange-substance.html

China just canceled all planned science missions for the Chang'e mission's Yutu-2 rover on the far side of the moon, after spotting something curious in a nearby crater - and finding a strangely colored "gel-like substance" in said crater.  It's investigating now, and the science teams are 100% focused on figuring out just what this substance is.  No further word available yet.

COULD just be melt-glass from an impact, but a: that doesn't fit "gel" in my opinion (unless it's got a melt-point near 120C, surface daylight temperature) and b: you'd expect to see impact glass all over the place in small craters, so it shouldn't be weird enough to throw out the schedule and focus everything the team has on it.

Maybe it is just that, and a big overreaction in their space program, but then again...maybe something weird just happened.

No, no, no... we were warned in 1985! It's, THE STUFF!

For the uninitiated: https://en.m.wikipedia.org/wiki/The_Stuff

Planetary invasions aside. Likely, just melted/slagged meteorite? Or, more likely, a little grandstanding for the peeps back home.
« Last Edit: 31 August 2019, 00:55:11 by Ogra_Chief »
BattleTech @CGL_BattleTech · Jul 17
Harmony Gold no longer has any say in our decisions, however, the original mechs have been redesigned enough to not cause problems.

Sabelkatten

  • Major
  • *
  • Posts: 5111
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1406 on: 31 August 2019, 04:45:06 »
Given the Chinese penchant for "dramatic reveals" it wouldn't surprise me if they're busy examining part of their lander or something... ::)

But let's hope it something new!

Daryk

  • Lieutenant Colonel
  • *
  • Posts: 10140
  • The Double Deuce II/II-σ
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1407 on: 31 August 2019, 06:46:42 »
It definitely looks like Our Space has just discovered that "one weird trick" meme...

Wrangler

  • Colonel
  • *
  • Posts: 16716
  • Dang it!
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1408 on: 31 August 2019, 09:38:15 »
Hope the Cape doesn't take too much damage from the Hurricane barreling by it. Hope people don't get hurt eitherr!
"Men, fetch the Urbanmechs.  We have an interrogation to attend to." - jklantern
"How do you defeat a Dragau? Shoot the damn thing. Lots." - Jellico 
"No, it's a "Most Awesome Blues Brothers scene Reenactment EVER" waiting to happen." VotW Destrier - Weirdo  
"It's 200 LY to Sian, we got a full load of shells, a half a platoon of Grenadiers, it's exploding outside, and we're wearing flak jackets." VoTW Destrier - Misterpants

Thunderbolt

  • Master Sergeant
  • *
  • Posts: 242
  • ex scientia, ad astra
Re: Deep Space and Interplanetary Exploration - The Universe is Timeless
« Reply #1409 on: 31 August 2019, 12:00:21 »
Most of the observations behind that fallacious pseudo-theory are based on observations of other galaxies.

Not arguing that the observations aren't real. Just every so-called "hypothesis" for DM is fit to a selected set of observations, and falls over once you bring in other data. In addition, none have yielded testable predictions that have succeeded - those that have made predictions, that can be tested, fail.

And let's not forget that the quantity of "missing matter" is continually being downgraded. To the point where we can probably explain the universal expansion without dark matter, but not the galactic rotation issues.

My personal theory is that if there is dark matter, it's the mass of grant application paperwork for academics who want to be funded to research dark matter.  :flame:

Now Dark Energy - at this point, no-one's staking much ego on predictions. They're still observing, measuring, and validating. The theories are clearly initial best guesses, and no-one's creating an industry. But it does indeed look like there's some strange **** happening with gravitation on mega-scale distances that we don't yet understand.
re: DE

In GR, understand that you basically have

G = T

Curvature tensor = Stress-Energy tensor

On the LHS, you have something reflecting the curvature of the space-time fabric.  On the RHS, you have something reflecting the mass-energy distribution within space-time causing it to curve.

If you add in a Cosmological Constant L, you get either:

G + L = T

-or-

G = T - L

If you move L to the RHS (G = T - L), you can interpret it as a stress-energy arising from an exotic mass-energy distribution having fantastical properties

If you keep it on the LHS (G + L = T), it merely expresses a sort of inherent curvature, present within the fabric of space-time, even in the absence of any mass-energy.  So understood, it would simply say that, on the largest of cosmological scales, the fabric of space-time doesn't "lie flat", but has an "inherent warp", ever so vaguely like the upward bowing built into (some) flatbed semi trailers, such that they arch upwards in the middle when empty, and only lie flat under load

I guess you get better hype & headlines with the more exotic interpretation, which is more popularly publicized, even if the more mundane interpretation is equally valid

 

Register