astronomy

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pageflight, w The IAC confirms the existence of a Super-earth in the habitable zone of a Sun-like Star

20ly away. I guess that does qualify as “nearby,” astronomically.

themoken,

In a certain way, it does feel close. We can’t figure out how to go faster than light, but we could theoretically get to a significant fraction of c and 20 years isn’t such a long time to plan for in terms of getting a probe there to start relaying messages that take 20 years to get back.

I mean, it’s the span of a career, but people could conceivably work on the launch and live to see it return data.

LordTrychon,

Breakthrough Starshot project is working towards accelerating a probe close to 20% of C. That’s a significant fraction of C in these terms.

Even if we could get to .25 C, that would be 80 years for the probe to get there, and then 20 more for the data to come back.

But yes, that is still VERY close.

humanspiral, w Astronomers seek global ban on space advertising

This is Barbara Streissan publicity when you had never thought about her for 50 years. We must all agree to a ban to stop China from working on it, while we “debate American freedom”

rockSlayer, w The IAC confirms the existence of a Super-earth in the habitable zone of a Sun-like Star

That orbit is better described as passing through the habitable zone. How this would affect potential life, I have no clue, but it certainly isn’t a stable orbit in the habitable zone like earth or mars

knightly,
@knightly@pawb.social avatar

Another article said it had 6.6 times earth’s mass, and now I’m really curious about the diameter and atmospheric composition. It sounds like it’d be a big Venus that alternates between freezing and boiling.

rockSlayer,

It sounds like an extremely interesting planet for sure, I hope they point Webb at it to get an atmospheric spectral analysis soon!

sharkfucker420, w Astronomers seek global ban on space advertising
@sharkfucker420@lemmy.ml avatar

If they put fucking ads in space I will do things I cannot say online

Majorllama, w Astronomers seek global ban on space advertising
@Majorllama@lemmy.world avatar

God I can’t wait to be kept up all night by the warm glow of the giant Coca-Cola ad in space shining down on me at night.

In other news I’m radicalized now.

I swear to God if I see space advertisements I will organize a militia so goddamn fast.

fsxylo,

Aurora borealis: sponsored by Netflix

Lemminary,

Don’t give them any ideas or I’ll hold you personally responsible. >:|

Subtracty, w Astronomers seek global ban on space advertising

Can’t even escape to the great outdoors. I’ve never even considered this type of advertising as a possibility. Fuck that’s bleak.

stelelor, w Astronomers seek global ban on space advertising

Jesus fuck, Wall-E was supposed to be a dystopia, not an inspiration.

darvocet, w Astronomers seek global ban on space advertising

Apparently these “astronauts” dont understand the world we are living in. They should just be happy we’re allowing them to visit the Tesla ® Moon.

Hackworth, w Astronomers seek global ban on space advertising

Astronomers find space advertising

atro_city, w Astronomers seek global ban on space advertising

We won't stop polluting until the world is unlivable. Gotta love humanity.

SweetCitrusBuzz, w The IAC confirms the existence of a Super-earth in the habitable zone of a Sun-like Star
@SweetCitrusBuzz@beehaw.org avatar

Absolutely not until lifeforms on this planet have learned to look after this one first.

WalkingOnEggshells, w The IAC confirms the existence of a Super-earth in the habitable zone of a Sun-like Star

My life for Super Earth!

Didros, w Astronomers discover repeating radio bursts from distant 'dead' galaxy

Do we know what we did with radio when it was first discovered to know what it would be like if it bounced back to us? Or would it not have been strong enough?

acockworkorange,

Quadratic decay plus reflection losses plus only a fraction of the emitted signal being reflected: pretty much guarantees we wouldn’t be picking it.

some_guy, w Astronomers just deleted an asteroid because it turned out to be Elon Musk’s Tesla Roadster

He’s fucking things up in space, even.

Quill7513,

his stupid fucking internet satellites make planning getting things into orbit real hard. also it’s not even his tesla in space. he stole it from mark eberhart

Plum, (edited )
@Plum@lemmy.world avatar

And his 6,000+ starlink pieces of trash in orbit have made earth based telescopes worse. They get in the way of the shot, and the emissions are something like 10x worse than promised.

Him and that tetraethyl lead guy. Just absolute stains.

Edit: no its 32 times the noise. It’s a known issue, and it’s been happening since the beginning.

Peppycito,

Nit to mention all the methane his rocket is adding to the upper atmosphere.

halcyoncmdr,
@halcyoncmdr@lemmy.world avatar

SpaceX rockets don’t add Methane to the atmosphere. When you burn something, you’re not adding that thing to the atmosphere, you’re adding byproducts from the combustion, and Methane isn’t one of the byproducts of any rocket fuel.

Starship uses methane as a fuel, but that’s not at all the same thing. Methalox engines are one of the cleanest burning rocket fuels after Hydrolox. When burnt, methane just becomes CO2 and water vapor along with a bit of NOx (Nitrous Oxide, aka laughing gas, aka that boost you see in Fast and the Furious) as well.

Falcon 9 and Falcon Heavy are Kerolox (Kerosene, RP-1) engines. RP-1 is basically just a highly refined kerosene. When burnt, it will produce CO2, water vapor, NOx, carbon soot, carbon monoxide (which again mostly becomes CO2) and a little bit of sulfur compounds. The exhaust is nasty but it is not that different from what a normal internal combustion car produces. And even with the large amounts, it is still lower than what cars/trucks/SUVs output to get everyone in your city back and forth to work, the grocery store, and home on a daily basis.

Peppycito,

Rocket engines don’t just immediately start, propellant has to be flowing through the turbo pumps before the flames start. Same at shut down. On the video you can see vapour coming out. That’s either methane or oxygen. How much of either? We can’t say because spacex doesn’t talk much about it. Same with ‘venting’ which happens quite a lot as shown on the videos as well. Whether it’s a little or a lot, it’s definitely more than was there before launch.

And that’s on a successful launch. Scott Manly talks about the last launch and shows how the methane levels were draining on the ship way faster than the oxygen levels, pointing to at least incomplete combination and probably methane puking out the back. Methane may be ‘clean’ when it’s burnt under optimal conditions, when it’s conflagrated in a RUD it’s less so.

Yes, yes, “it’s a drop in the bucket, it’s a tiny percentage of blah blah blah” which works fine until they start launching 3 per day. Then the question of what methane (a highly potent greenhouse gas) does when it’s directly added into the upper atmosphere gets answered.

XeroxCool,

NOx is not Nitrous Oxide and is not short for Nitrous Oxide. Nitrous Oxide is specifically N2O. NOx refers to both Nitric Oxide (NO) and Nitrogen Dioxide (NO2), both of which are far, far more damaging to health and atmosphere than N2O. NOx emissions are the reason diesel is generally nonexistent in US passenger vehicles - not even great mpg numbers have sufficiently-low NOx emissions.

Even if it included N2O, using nomenclature with a variable like “NOx” and grouping it all together as one inert byproduct vastly underrepresents harm. Imagine if you referred to another group as “COx” but saying it’s relatively inert and easily detected by way of a burning lung sensation but feeds plants so it’s not all bad because Carbon Dioxide (CO2) has that effect. Carbon Monoxide (CO) is completely left out of that description and will silently kill you.

Kecessa,

The part you’re not talking about is that there’s no catalytic converters on rockets tough, so it’s more like running a carbureted car than a modern car.

Kichae,

But muh rural internet is not as good as muh urban internet! So, forgiven!

glimse,

How many times can a chunk of our tax dollars go toward paying private companies to not deliver rural broadband? Let’s find out!

Kecessa,

In many locations it’s the difference between having Internet and not having it at all. The only issue with it is it being privately owned.

snausagesinablanket,
@snausagesinablanket@lemmy.world avatar

deleted_by_author

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  • deur,

    Sorry dude but most people have shit they care about alongside other things. Fuck starlink.

    Quill7513,

    that he keeps metering access to because he has a clear favorite in that war and it ain’t Ukraine. have you talked to any Ukrainians how they feel about the world’s richest nazi? because the Ukrainians i’m in community with fucking hate that guy and actively seek technological edges to treat starlink as actively hostile to their usage.

    JokeDeity,

    But are they really? And as much as they could be? It’s just another tool for him to control and fuck people.

    halcyoncmdr, (edited )
    @halcyoncmdr@lemmy.world avatar

    Not really here, this would have been a dummy weight either way since it was the test payload for Falcon Heavy. So *something *was going to be sent up. The Tesla specifically was a publicity stunt, but a similar weight was going into a similar orbit.

    The bigger question is why they lost tracking on it in the first place to where they weren’t sure what it was. This wasn’t from any sort of failure, this was a planned and fully successful launch payload into a planned orbit.

    shitcomputerologist,

    Tracking doesn’t necessarily have to be lost for this kind of thing to happen. The Rosetta spacecraft was accidentally given a provisional asteroid designation in 2007.

    en.wikipedia.org/wiki/Rosetta_(spacecraft))

    Earflap, w [Seeking Advice]Amateur Radio Telescope

    This redditor is both a ham radio operator, and an actual radio astronomer! Might be willing to answer some of your questions, maybe.

    conditional_soup,

    I dunno if you meant to link to a sub instead of a user, but that’s what I’m seeing. That sounds awesome! Thanks for sharing!

    Earflap,

    She’s very popular and I would imagine gets lots of messages. I’m not sure if she would prefer to have you message her directly or post on the subreddit. Either way, Andromeda321 is the real deal. Good luck! Be sure to post your pics here, I bet they’ll be real cool!

    conditional_soup,

    Awesome, thanks! Don’t hold your breath, though. Right now, this thing is paying for itself, and it’s not much. My first goal is to get a used DSLR so I can take promotional pictures. I know it’s a manually slewed scope, but I’m not trying to take crazy multi-hour exposures, I’m trying to show what people might expect to see IRL, and take promotional shots of people on the class. Then, I’ll probably look at making the radio telescope rig more seriously, hopefully before summer.

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