astronomy

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luckystarr, w Half of the universe's hydrogen gas, long unaccounted for, has been found

If I understood this correctly, they analyzed incredibly blurry images and concluded that there are clouds of gas around galaxies, then they extrapolated the found gas up to all or almost all galaxies and concluded that it can fulfill the calculated expectations.

BaroqueInMind,

Thank you. Saved me a click?

OfCourseNot,
@OfCourseNot@fedia.io avatar

What I understood is kind of the opposite–they already knew there were hidrogene clouds around galaxies but analyzed some almost imperceptibly blurry images and found they were bigger than currently thought. They're blurry because they were taken in some wavelength not observable until now that is scattered by the ionized gas.

Kichae, w Hubble Space Telescope YouTube channel has been deleted

Seems like it wouldn’t have cost much to keep the original channel up, though.

As if any of what’s going on has to do with costs.

threelonmusketeers, w We planned for the unexpected, say stranded Nasa astronauts from space station

stranded Nasa astronauts

They are not currently stranded, and were never considered stranded, except maybe for the few days between Starliner’s empty return and the Crew-9 Dragon’s arrival.

This also isn’t really relevant to astronomy.

Yawweee877h444, w Don’t panic, but an asteroid has a 1.9% chance of hitting Earth in 2032

Sigh. Why can’t it be 109%

This place sucks.

psud,

It’s not big enough to fix anything. If it hits, it won’t hit America or Europe

It’s in the big nuke scale of energy, enough to do a lot of damage to a small area. Were it to hit a city, the city would need a lot of rebuilding. Were it to hit, few people would be in danger as we will have years of warning. The only people in the impact area would be “storm chasers” travelling to see the impact

Floshie, w Don’t panic, but an asteroid has a 1.9% chance of hitting Earth in 2032

should I mention “don’t look up” ?

expatriado, w Don’t panic, but an asteroid has a 1.9% chance of hitting Earth in 2032

that was Trump chances in 2016…

Gradually_Adjusting, w Atmospheric analysis shows Venus never had Earth-like life, scientists say
@Gradually_Adjusting@lemmy.world avatar

I can’t say I’m surprised

…But my relief is profound

AOCapitulator, w Elon Musk destroys astronomy
@AOCapitulator@hexbear.net avatar

It is the moral imperative of all living humans to strive to murder Elon must as soon as possible

BedSharkPal, w OP: "This is my most advance moon photograph EVER it consist of 81000 images and over 708GB of data." (see comments.)

It’s crazy to me that you can get this much detail even through our atmosphere.

lolcatnip, w [Eric Berger] Seeing this eclipse is probably the highest-reward, lowest-effort thing one can do in life

Y’all, the article is obviously written for people in the path of totality. You’re not being clever complaining about the cost and hassle of traveling.

spoopy, w [Eric Berger] Seeing this eclipse is probably the highest-reward, lowest-effort thing one can do in life
@spoopy@lemmy.world avatar

Niagra falls City has preemptively declared a state of emergency because of how much of a shit show this eclipse is going to be

Graphy, (edited )

My wife works for the NPS and her old coworker invited us to help out with their eclipse event in Ohio. Apparently they’re already prepping to close all the parking lots and are real worried they won’t have enough rangers.

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

There are people that don’t get headaches?

Jakdracula,
@Jakdracula@lemmy.world avatar

I rarely get headaches. Haven’t really ever gotten any headaches throughout my life.

EddoWagt,

Same, maybe 1 or 2 really mild ones, that were just kind of annoying for a minute or so

Leg,

Here I am getting migraines so bad I contemplate self- terminating on a monthly basis. Life can be cruel.

EddoWagt,

My mom gets that as well, seems awful

aStonedSanta,

I get migraines or just started too. But never get head aches. Migraines for me just make light too overwhelming to look at but it isn’t pain. It’s almost confusion it causes me.

exocrinous,

I’ve never gotten a headache in space.

fossilesque,
@fossilesque@mander.xyz avatar

Bro, I don’t even need to go anywhere. In fact, I’d rather be in a dark room lmao.

BakedCatboy, w For this dead star, 72 years is a single Earth day

Had to read the article to find out that they mean 72 “years worth of orbits” happen in 1 earth day. Although unlikely I was hoping that it was orbiting so fast that 1 earth day there would pass 72 earth years to a stationary observer due to time dilation. Not sure how fast it would need to go for that to happen.

XeroxCool,

Since time and speed are relative, to have 1 Earth day on the star and see 72 years on Earth, it’d simply be a speed multiplier of 72*365.24= 26,296.28 times faster. Our solar system orbits the galactic center at 250km/s or 0.0008c, so ~26k times that puts it at nearly 22c relative to us. So no.

But quite frankly, there must be a way to be a slower observer. Earth’s orbital speed is about 30km/s (0.0001c) so that drops the product way down to 2.6c. And while the Parker Solar Probe holds the record for the fastest man made object at 0.0006c at its closest solar approach, it actually took a lot of energy to slow it down to get it to the sun and stall it’s orbit. Otherwise, it’d just orbit it the same as the Earth. It slides out to a Venusian distance from the sun at apogee and drops to 12km/s, halving the differential requirement to +1.2c. But if everything is relative, how do we even determine where 1c is and know it’s so definitively impossible to reach? I don’t know, I’m starting to have an existential crisis. Maybe time just keeps dilating and simple addition/subtraction doesn’t apply for appreciable values of c so you have to start multiplying in decimals.

BakedCatboy,

Relativistic time dilation is nonlinear, so the time dilation “multiplier” approaches infinity as you approach the speed of light. So you will never need more than 1c to pass any finite amount of time for the observer while only passing a smaller amount of time for the moving object. Using a time dilation calculator, it looks like 1 day inside the moving object to 72 years for the stationary observer works out to roughly 99.9999999% the speed of light (9 nines total). Of course if you take into account earths movement as a “stationary” baseline then it’ll depend on whether you’re moving with or against the fast moving object.

It used to melt my brain too but there’s no need to know “absolutely stationary” since you’re comparing 2 objects. And due to the time dilation, the 1c limit is different depending on the observer, the time dilation will prevent anyone from observing >1c even if one person is going 0.9c relative to another person who is also going 0.9c relative to a stationary observer.

Gork, w U.N. committee to take up issue of satellite interference with astronomy

COPUOS operates by consensus, requiring approval of all of its more than 100 member states to move forward on any issue, and thus allowing even a single nation to block action

That’s a shitty way to get anything done. Unanimous approval should only be for really big issues. Otherwise just let it be a majority vote.

Maalus,

Countries were felled because of veto powers. It’s a stupid approach to most things.

Anticorp, w NASA looking for 4 volunteers to spend a year living and working inside a Mars simulator

There will be millions of applicants for this. They’ll get the cream of the crop for this experiment. If we ever end up actually going to mars then these people will be in every history book.

agressivelyPassive,

Would be interesting to choose bottom of the barrel and average Joe control groups.

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