astronomy

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wischi, w Most Astronauts Get ‘Space Headaches.’ Scientists Want to Know Why

Too much blood in their head because of zero g?

1024_Kibibytes,

The article suggests something similar:

“As gravity loosens its grip, blood, lymph and cerebrospinal fluid drift from their usual locations and begin to exert pressure elsewhere.”

verity_kindle, w ESA's Euclid Telescope Has an Ice Problem
@verity_kindle@lemmy.world avatar

That is fascinating, I want to know, is there any way to prevent this during assembly? Even with extreme clean room protocols! Does it happen with other telescopes?! Down the rabbit hole, I must go.

MeanEYE, w A Nearby Star Is Expected to Go Nova This Year. Here's How You Can See It.
@MeanEYE@lemmy.world avatar

So, there’s nothing in universe that is longer than “soon”. This prediction of going nova this year, only means it already happened but you can’t see it yet. And since it’s going super nova, that means entire even will be boring anyway. You’ll see a white dot that will increase in intensity during this year and then fade away equally slowly.

For people wondering about dates, there are none. Just like Beetlejuice is expected to explode soon™, that actually means 3000-10000+ years of waiting. So don’t get your hopes up. Out lives are but a blink in universe. All you can do is be diligent and watch it constantly. Doesn’t mean you’ll see much either since at peak magnitude of 2.5 it will be dim enough that you’ll need telescope to see it.

XeroxCool,

Nova, not supernova. Novas happen multiple times. Supernova do not but it doesn’t say supernova. Soon, as in within the next 6 months since its following a cycle that happened about 80 and 160 years ago.

nulluser,

Visible with unaided eyes for several days (but still dimmer than about 120 stars in the sky), and with binoculars for about a week, according to NASA.

stockRot,

Did you read the article? Or do you just like talking?

nayminlwin, w Study: Dark matter does not exist and the universe is 27 billion years old

There’s no dark matter, only dimension flattening weapons being fired at each other by advanced aliens.

electric_nan, w The US government seems serious about developing a lunar economy

Develop the fucking US economy.

Linkerbaan, w The US government seems serious about developing a lunar economy
@Linkerbaan@lemmy.world avatar

I thought economists were the stupidest people. Military economists proved me wrong.

WarmSoda, w A Nearby Star Is Expected to Go Nova This Year. Here's How You Can See It.

Humans have seen this nova lots of times before. It was first identified by astronomers in the late 1800s, and it bursts about every 80 years.

Indeed, the explosion heading our way would have taken place thousands of years ago, but requires all that time for the light to reach us.

Still, it’s worth checking it out – T Coronae Borealis last shone in 1946 and this will be the last viewing opportunity before the early 2100s.

Very cool.
That is, until the article says to check out Twitter for how to actually see it.

Immersive_Matthew,

Right. I avoid Twitter at every opportunity. I want nothing to do with that cease pit.

nulluser, (edited )

en.m.wikipedia.org/wiki/T_Coronae_Borealis

On 20 April 2016, the Sky and Telescope website reported a sustained brightening since February 2015 from magnitude 10.5 to about 9.2. A similar event was reported in 1938, followed by another outburst in 1946.[20] By June 2018, the star had dimmed slightly but still remained at an unusually high level of activity. In March or April 2023, it dimmed to magnitude 12.3.[21] A similar dimming occurred in the year before the 1945 outburst, indicating that it will likely erupt between March and September 2024.

And if I’m interpreting some of the other content correctly, it’ll come and go in one night? Maybe someone who knows more about these can confirm or correct me.. See update below.

Also …

Even when at peak magnitude of 2.5, this recurrent nova is dimmer than about 120 stars in the night sky.

So, maybe a bit anticlimactic. 😞

Update: … …nasa.gov/…/view-nova-explosion-new-star-in-north…

Once its brightness peaks, it should be visible to the unaided eye for several days and just over a week with binoculars before it dims again, possibly for another 80 years.

WarmSoda,

So no range of dates then? Still pretty damned cool.

nulluser,

Between March and September, but that’s a pretty wide range. I guess just keep an eye out for the, “IT’S HAPPENING” posts.

XeroxCool,

Reminds me of when Betelgeuse, the orange upper star of Orion, went dim in 2020. Lots of amateur reports on its brightness, 3x per night, for a few months waiting for it to go nova. It settled down a bit before disappearing behind the sun for the season and came back just fine. It was kinda fun to monitor, but soooo many false alarms from people trying to call it first

WarmSoda,

Definitely will keep an eye out. Already have the eclipse in the calendar too.

FreudianCafe, w The US government seems serious about developing a lunar economy

Cant wait to see how they will use moon real estate to produce a new kind of homeless people

kalkulat, w The US government seems serious about developing a lunar economy
@kalkulat@lemmy.world avatar

Sure, why not? It’s not like we have any other pressing issues to address. Let’s keep pouring 100s of billions into the right pockets and press on.

threelonmusketeers,

“Por que no los dos?”

Humanity can pursue multiple awesome endeavours simultaneously.

atzanteol,

NASA’s 2024 budget is around $25 billion.

By comparison Apple’s revenue for last quarter was around $120 billion.

conditional_soup, w The US government seems serious about developing a lunar economy

Nope. No. Nuh-uh. Stop fucking up this planet, then we can talk. I’m drawing a line in the sand, I’m going to become an eco-terrorist if I see a fucking Coca-Cola ad when I look into the night sky.

Audacious,

All I think of is the movie, The Time Machine. Spoiler, the main character goes forward in time and sees the moon breaking apart, causing a collapse of civilisation.

NegativeLookBehind, w The US government seems serious about developing a lunar economy
@NegativeLookBehind@lemmy.world avatar

What’s the USD to MOONBUX conversion rate?

TIMMAY, w Study: Dark matter does not exist and the universe is 27 billion years old

hogwash

lolcatnip, w Study: Dark matter does not exist and the universe is 27 billion years old

Man, lots of people in this thread seem happy to accept any wild, physics-breaking idea rather than accept that there’s just a bunch of matter we can’t see.

DAMunzy,

I think it goes beyond not being able to “see” it and goes to we can’t detect it at all. Doesn’t dark matter just fill in the mathemagical holes with some numbers to make it all work?

SkyeStarfall,

We can detect its gravitational influence, as it interacts via gravity. The issue being that gravity is a weak force, and so there’s a lot of room for speculation.

But there is a lot of evidence backing up dark matter existing. But it’s not definitive yet.

DAMunzy,

I get that but it still sounds woo-woo since we can’t directly detect it. I’m not naysaying since I realize it’s the best we have and I’m not smart enough to come up with anything better.

iknowitwheniseeit,

I mean, I guess it depends on what you mean by “directly detect”. We measure neutrinos by having photoreceptors in huge tanks of very pure water deep under old salt mines… which hardly seems more direct than looking at where galaxies and stars are moving and calculating the gravitational pull and noticing that something is missing…

Leate_Wonceslace,
@Leate_Wonceslace@lemmy.dbzer0.com avatar

Dark matter is matter that we infir to exist only on its gravitational effects. We’ve observed its existence by the fact that it seems to clump up in the middle of two massive super-solar structures following a collision.

btaf45,

We can indirectly detect dark matter thru gravitational lensing. That is how NASA created this map showing the actual locations of dark matter in tinted blue.

science.nasa.gov/…/hubbles-dark-matter-map/

DAMunzy,

That’s a cool one!

jenny_ball,
@jenny_ball@lemmy.world avatar

you can also sort of directly see it with certain colliding galaxies

Ludrol, w Study: Dark matter does not exist and the universe is 27 billion years old
@Ludrol@szmer.info avatar

The Covarying Coupling Constants theory posits that the fundamental constants of nature,[…], are not fixed but vary across the cosmos.

This undermines current fundamental axiom of science that laws of physics are constant across universe. Until we go there and measure them to be actually different. This hypothesis doesn’t have a leg to stand on.

BarryZuckerkorn,

I’m skeptical of this theory as well, but I’d point out that our observations show that at galaxy scales, gravity is much stronger in certain places than we’d predict using our current model of gravity and the matter we can otherwise detect, and at even larger scales the acceleration of the universe’s expansion is being driven by something we don’t understand.

Right now, the dominant theory in cosmology is that each of these observed phenomena are driven by dark matter and dark energy, but we don’t have any direct evidence of the existence of either, just indirect evidence that stuff doesn’t behave as we might expect.

So it’s a choice between theories that don’t make intuitive sense, and break some fundamental assumptions about physics.

Twinkletoes, w Study: Dark matter does not exist and the universe is 27 billion years old

Tired light makes a lot of sense to me 🥱

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