astronomy

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snausagesinablanket, w The amazing helicopter on Mars, Ingenuity, will fly no more
@snausagesinablanket@lemmy.world avatar

A bipedal robot with a jet pack powered by Co2 is next.

1984, w Japan's precision moon lander has hit its target, but it appears to be upside-down
@1984@lemmy.today avatar

That earth doesn’t look flat.

plinky, w Discovery of second ultra-large structure in distant space further challenges our understanding of the universe
@plinky@hexbear.net avatar

oh damn, maybe they’ll fuck up inflation again 🥳

Brunbrun6766, w Discovery of second ultra-large structure in distant space further challenges our understanding of the universe
@Brunbrun6766@lemmy.world avatar

Doubt, something unknown? Sure. Structure? Doubt.

FishLake,

“Structure” in this case means “big glob of galaxies slightly closer together than other globs”

halcyoncmdr,
@halcyoncmdr@lemmy.world avatar

In astronomical terms structure doesn’t mean a building of any kind.

universe.nasa.gov/…/large-scale-structures/

YeetPics, w Frozen water discovered on Mars could fill Red Sea
@YeetPics@mander.xyz avatar

Just cuz you got the water from mars doesn’t make the sea red! God you kids are scientifically illiterate af.

/S

Spzi, w The Orion You Can Almost See

Thank you, great post!

I recognized the constellation. Though it’s good to have a refresher, and I learned something new.

MachineFab812, w The Orion You Can Almost See

That link changes daily, so for now I’mma just have to link to this thread.

Still, holy shit.

BradleyUffner, w Scientists found a primordial galaxy with a bunch of gas and no stars

How is this different from a nebula?

makyo,

Seems like you could call this a galaxy-sized nebula

AmosBurton_ThatGuy, (edited )
@AmosBurton_ThatGuy@lemmy.ca avatar

From my amateur understanding of space, it seems to be a galaxy made of just primordial hydrogen and helium, back before the first stars formed and started creating heavier elements due to the fusion reactions that power stars and the eventual supernovas that further dispersed and helped to create even more heavy elements.

Another cool theory is that the first stars are thought to have been much, much more massive, possibly up to around a thousand solar masses since they were made solely of hydrogen and helium. It’s estimated that current stars couldn’t get above a few hundred solar masses at most due to the existence of heavier elements in modern gas clouds. I don’t understand enough to explain why the existence of heavier elements limits star size so I’ll leave that to someone smarter than me.

Someone correct me if I got anything wrong, again I only have an amateur level of understanding about space.

XeroxCool,

I think the heavier elements exponentially speed up stellar death. In part, the fusion of elements makes the core denser and denser each step of the way. Going from hydrogen to helium is twice as dense, but helium is still a good fuel so it isn’t an issue. As fusion continues through carbon and oxygen, it shrinks but still burns. Iron is the tipping point though because it doesn’t work as a fuel at all - it triggers a core collapse, the surface falls into the void, and everything heavier than iron is instantaneously fused and thrown into the universe.

So I would guess the lesser abundance of heavier elements early on delayed that process compared to today’s standards. Sort of like making a snowman in fresh powder and having to melt/wet the snow to make it pack vs having a little rain and higher temps after the powder to wet it

AmosBurton_ThatGuy,
@AmosBurton_ThatGuy@lemmy.ca avatar

Thanks for the explanation! :)

rbhfd,

The amount of heavy elements present in a star when it formed will be neglible to the amount that will be created over time through fusion.

You can actually detect this through spectroscopy because the initial amount of metals will be present in the outer layer of the star. Heavy elements made through fusion will be mostly in the core.

The reason stars formed from primordial gas, i.e. only consisting of hydrogen and helium, is that such a gas will fragment less as it cools and collapses. Less fragmentation means heavier stars.

I only have a high level knowledge of the process though.

verity_kindle, w Astrobotic's Peregrine lander suffers propulsion issue, making moon landing unlikely

That’s frustrating. Anyways, SpaceX! Turnaround record of 3 hours! Something fails, learn from it and launch another one. The ULA invests so much money and time, it makes every mechanical or propulsion failure seem catastrophic.

Valmond,

It might be cheaper but it’s not like its free you know.

jadero, w Total solar eclipse 2024: Live updates

I’m more interested in the magical appearance of four states in “southeast” Canada than yet another solar eclipse.

Did someone forget to vet the AI’s output?

hperrin, w The Phases of Venus

Fun fact: Venus and Mercury wouldn’t have phases if the earth were flat and the sun were small and close.

(At least, they wouldn’t have a “new” phase.)

asg101, w After all of This Time Searching for Aliens, is it The Zoo Hypothesis or Nothing?

My theory is that if any ETI exists, our species is under quarantine until we have either grown up or burned ourselves out. They will have seen violent, self-destructive beings in the past and know it is dangerous to let them spread and destroy peaceful society. If they can travel between the stars, they would have to be able to communicate to keep cohesion, this communication could very well include the warning “Avoid this system, there are killer apes on that planet”.

Spacehooks,

Or avoid the vampires, werewolves, and zombies that are constantly around based on the intercepted documentaries.

asg101,

Well the vampires are on the nightly news reports about Wall Street, and zombies are shown in attendance at every tRump rally… so yeah the ETs would certainly know they are quite prevalent here. Don’t see as many werewolves in the news, but they interview a shit ton of ghouls.

stelelor, w Titan's 'magic islands' are likely to be honeycombed hydrocarbon icebergs, finds study

Great article, but that “summary” diagram from the original author is garbage lol

Thorned_Rose, w Neptune and Uranus seen in true colours for first time
@Thorned_Rose@kbin.social avatar

Bit of a misleading title - not for the first time, but rather seen accurately again.

DriftingDeep, w Neptune and Uranus seen in true colours for first time

InB4 “Uranus seen in true colors for first time.”

Really though, I don’t know why it never crossed my mind that the picture of Neptune was so… saturated. It’ll take a little bit to reconcile this new perspective of a “light bluish-green” Neptune. It’s just so jarring to alter a belief held since my childhood.

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