astronomy

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kadu, in City-size 'devil comet' headed for Earth loses its iconic horns and turns green after latest volcanic eruption
@kadu@lemmy.world avatar

I absolutely hated the Devil Comets on Mario Galaxy

TheCaconym, in Scientists uncover aurora-like radio emission above a sunspot

Someone on Earth has decided to call the Trisolarans, major mistake

niktemadur, (edited ) in The echoes from inflation could still be shaking the cosmos today

Perfect timing, as just this past week I’ve been wondering about these low-frequency gravitational waves that were announced with a splash last summer, then I heard nothing, that is until now.

It takes a while to go through the data and find specific parameters you’re looking for. This is radio astronomy, using data from antenna telescopes all over the world. For comparison in a similar type of project, it took two years to crunch the numbers from the Event Horizon Telescope and resolve a fuzzy image of the supermassive black hole in M87.

eskimofry, in The echoes from inflation could still be shaking the cosmos today

It’s still shaking my money loose from my wallet

angrystego, in Supermassive black hole at the heart of the Milky Way is approaching the cosmic speed limit, dragging space-time along with it

“As light travels close to a rotating black hole, the rotation of spacetime causes the light’s path to be curved or twisted,”

I don’t get it. If the black hole didn’t rotate, would the light’s path not be curved by the gravity caused by the black hole’s mass alone?

What is the relationship between spinning and gravity?

soupspoon, in What was it like when cosmic inflation occurred?

The first of 31 articles- I look forward to this series!

btaf45,

Yeah. Can’t wait for more!

Anticorp, in NASA and Japan to launch world's 1st wooden satellite as soon as 2024. Why?

Awe, a little baby Borg cube! Are they going to put an AI on that?

peanuts4life, in Is gravity instantaneous?
@peanuts4life@beehaw.org avatar

No.

Pons_Aelius, in This AI robot chemist could make oxygen on Mars

Yet another example of "Add AI to all the things even when it is not relevant in any way".

Never thought I would look back on the days of block chain with fondness.

That said, the tech they are researching is quite interesting.

bored_boar_onboard, in Construction on NASA Mission to Map 450 Million Galaxies Is Under Way - NASA

This sounds like a really neat mission. I’m glad to hear that it’s moving forward.

mindbleach, in Do gravitational waves exhibit wave-particle duality?

Surely that would require gravity to be quantized.

Shdwdrgn, in Twin galaxy of the Milky Way discovered at the edge of the universe

Site appears to be behind a paywall? The screen darkens when I visit although nothing pops up to indicate why.

ShittyBeatlesFCPres,

It loaded for me but here’s the paper it’s referring to: www.nature.com/articles/s41586-023-06636-x

According to the article, a galaxy far far away looked like the Milky Way a long time ago. According to simulations, anyway. So, we can use it (along with other similar galaxies at different distances) to learn about the evolution of the Milky Way, the galaxy where all the coolest people live.

Shdwdrgn,

the galaxy where all the coolest people live

Despite those losers from planet Earth dragging down the average? 😆 Thanks for the link!

ShimmeringKoi, in Enceladus has all the raw materials for life, researchers say

Damn someone made Barotrauma IRL

HurlingDurling, in Should Astronauts Be Allowed to Eat Each Other If They’re Starving?

As long as they toss the salad first

wahming, in Satellites Make up to 80,000 Flashing Glints Per Hour. It's a Big Problem for Astronomers - Universe Today

What’s the point of looking at the stars of we never reach for them? At some point the telescopes have to move into space, we can’t stay earthbound forever

Chetzemoka,

Or we could regulate the reflectivity of satellites. No one is suggesting we shouldn’t have satellites. Why don’t we do satellites on purpose in a way that still allows us to also do effective astronomy?

wahming, (edited )

No one is suggesting we shouldn’t have satellites.

Many astronomers suggested exactly that, they were against the approval of starlink.

we could regulate the reflectivity of satellites

Starlink has been doing that for 3 years now. There are limits to how nonreflective they can get the satellites.

Chetzemoka,

Standard issue Musk brain rot.

“Shouldn’t have satellites” at all vs. “maybe let’s not approve this one corporation doing this completely unregulated activity.” If you really can’t tell the difference between those two things, I can’t help you.

“limited to how nonreflective they can get the satellites”

Citation needed.

UlyssesT,

A hype-riding not-actually-a-scientist billionaire apartheid prince says it can’t be done, and no one that works for him wants to say otherwise because they don’t want to be fired.

halcyoncmdr,

Love how you also completely ignore the dozens of other companies designing and/or beginning deployment of massive satellite constellations just like Starlink. Some of them even multiple times larger than what Starlink is aiming for.

There very much are astronomers that have said they do not want ANY LEO satellite constellations.

This isn’t just a Musk thing.

beautiful_boater,
@beautiful_boater@hexbear.net avatar

They can’t make them non-reflective enough to not interrupt really deep observing. Also, that just shifts the problem around. If they are absorbing in the visible, they will likely have huge amounts of blackbody radiation in IR, sub/millimeter, and radio. You would need to make a satellite out of dark matter to not interrupt astronomy.

UlyssesT,

How about not putting a bunch of janky constantly-needing-replenishment laggy-internet satellites into orbit to begin with where the only real beneficiaries outside of bullshit “remote” excuses is the US military?

UlyssesT,

Throw enough glittering trash into orbit and your “can’t stay earthbound forever” platitudes become self-defeating because at some point nothing could be safely launched.

wahming,

The satellite constellations are in LEO. Kessler syndrome is literally not possible at that altitude.

UlyssesT,

I already knew that; my point was that letting your euphorically under-regulated corporate saviors do whatever they please (which can and probably will include higher orbit satellite junk later on) under pretenses of pretentious “reach the stars” platitudes is interfering with actual contemporary scientific inquiry, right now.

The pollution of each launch is significant, and the benefit of the janky low orbit network is questionable (except to the US military), especially because it requires constant additional launches.

sharedburdens,

but have you considered that this under-regulated shlock allows for command and control in warzones across the world shitty internet service in “remote areas”

sharedburdens,

Yo I have this amazing bridge I’m selling, and you seem like a wise investor.

UlyssesT,

Just use fluffy euphoric speeches about destiny and reaching for the stars, prattle that could fit in a movie with a soundtrack composed by Hans Zimmer, and you can sell the “I FUCKING LOVE SCIENCE” crowd almost anything, including actual contempt and dismissal for actual scientists (astronomers in this case). so-true

beautiful_boater,
@beautiful_boater@hexbear.net avatar

Man, I just went to a good seminar today on finding habitable exoplanets that emphasized that we currently need ground based telescopes, because it is still impractical to make 30+ meter telescopes in space and would be very expensive, even if could be done. But progress is just launching a bunch of bullshit into orbit to avoid real investment in infrastructure like fiber and other telecommunication lines.

UlyssesT,

But progress is just launching a bunch of bullshit into orbit to avoid real investment in infrastructure like fiber and other telecommunication lines.

With sufficient tweets/xeets/whatever about how “we can’t stay earthbound forever” and “we must spread the light of consciousness to the stars,” extremely credulous “I FUCKING LOVE SCIENCE” bazinga brains will happily see actual science being trampled upon in favor of performative spectacle bullshit.

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