astronomy

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superkret, w Dark Matter Black Holes Could Fly through the Solar System Once a Decade

If dark matter is fully explained by such black holes, their most likely mass, according to some theories, would range from 10^17^ to 10^23^ grams—or about that of a large asteroid.

In case this doesn’t tell you a lot, 10^17^g is half the weight of Mount Everest, and 10^23^g is 4x the weight of the Antarctic ice shield.

halfapage,

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  • Davel23,

    One, if it was a football stadium the size of Mount Everest.

    floofloof,

    I can only do Olympic swimming pools or bananas.

    remotelove,
    @remotelove@lemmy.ca avatar

    The earth is estimated to “weigh” 13,170,000,000,000,000,000,000,000 pounds. (That is weird when you think about it. The weight of the earth being based on what something weighs on earth, I mean.)

    Mt. Everest is only about 357,000,000,000,000 pounds and is just a tiny fraction of the mass of the earth.

    So. My point is that we need a better way to portray scale of things in the universe. AUs work to a point but then we have to quickly move to parsecs. Parsecs quickly give way to light years. (Or vice-versa, depending on how you visualize things better.) Light years kinda work, but only for between 14-26 billion years. Even after all of that, I can hardly still fathom the size of Mt. Everest. (This was a rant, but not an angry rant.)

    floofloof,

    The earth is estimated to “weigh” 13,170,000,000,000,000,000,000,000 pounds.

    Mt. Everest is only 357,000,000,000,000 pounds

    My point is that we need a better way to portray scale of things in the universe.

    Well, for a start, God uses the metric system.

    Mr_Blott,

    Fuckin everyone uses the metric system

    RandomVideos,

    Even aliens building the pyramids used the metric system

    butwhyishischinabook,

    God uses base 12, he doesn’t arbitrarily settle on base 10 just because he has that many fingers.

    chonglibloodsport,

    Weight in pounds isn’t the right unit here. Weight varies depending on the strength of the gravitational field you’re in, whereas mass does not. A kilogram here on earth weighs 2.2lbs but on the moon it only weighs 0.36lbs.

    Rato,

    In the English Engineering System, the unit of mass is 1 pound mass (lbm), and is equivalent to the amount of matter that weighs 1lb at 1G. I won’t argue that EES is a good system, but it does at least have a kludged unit for mass. It has an equally kludged unit for force, too, called pounds force (lbf).

    remotelove,
    @remotelove@lemmy.ca avatar

    I called that out. It was the weight of the earth… on earth.

    barsquid,

    I cannot fathom the size of anything on an astronomical scale. I have seen the videos that zoom out and show Earth at scale with the Sun and then the Sun at scale with other stars. No matter how many times I view the facts it will be incomprehensibly large.

    med,

    It’s a worth pointing out that pounds (lbs) is a measurement of mass, not weight, and is therefore not determined by the gravity acting upon it, or the source of it.

    Asafum, w Elon Musk destroys astronomy
    vovchik_ilich,

    Nah, that’s a fucking euphemism, we need a better word to describe it

    Rentlar, w NASA's solar sail successfully spreads its wings in space

    Thank you NASA, I didn’t know I needed

    BIG SPACE KITE 🪁

    LostXOR,

    Space kites are the best kind of kite!

    Noodle07,

    Omg we missed space kite surf at the Olympics can’t believe we screwed up so hard

    disguy_ovahea, w Suprising obvious fact: The Sun is a Star

    Totally! My favorite astronomical “wow” with my daughter was when she was 12. She wanted to learn about photography, so I set up a tripod at dusk to teach her about aperture, shutter speed, and motion blur. We also compared shots with a remote shutter so she could see how the slightest camera shake during a long exposure would result in a blurry shot.

    We were about to go inside once the stars came out, but instead I thought it would be fun to show her how they looked with a two second exposure. “Wait, why do they look like little commas? Are they moving?” I didn’t say a word. I just looked at her, and then it hit…

    😳”No! We’re moving!”🤯

    Facts aren’t nearly as interesting without the connection of self-discovery.

    lolcatnip,

    She came really close to another mind-blowing fact: if you’re talking about linear motion, there’s no difference at all between “they’re moving” and “we’re moving”. Too bad the apparent motion of the stars is caused by rotation, otherwise it would have been a great lesson to introduce basic relativity concepts.

    disguy_ovahea,

    She understood the curved lines as illustrating the rotation of the Earth. We didn’t get into motion away from the universal center.

    She’s much older now. Tyson’s version of Cosmos came out in her teens, so we watched all of those and then went back for the OG Sagan episodes. She’s my favorite nerd.

    lolcatnip,

    Yay!

    Yawweee877h444, w Hubble peers deep into Uranus, finds extra time

    If you’ve been wondering how long the day on Uranus is, you probably need to get out more.

    Great opening sentence.

    TachyonTele,

    Touch gas

    LazerFX, w Brightness of first Chinese broadband constellation satellites alarms astronomers

    And that’s because SpaceX at least try to minimise pollution (both light and radio). Not successfully, but it’s minimised.

    The Chinese don’t give a fuck, just like they don’t give a fuck who their toxic rockets land on when launched over their own people.

    x4740N, w Size Comparison: Pluto and Australia

    Pluto is still a sphere, this is an unfair comparison because Pluto hasn’t been unwrapped

    UnderpantsWeevil,
    @UnderpantsWeevil@lemmy.world avatar

    It’s actually 4π*(0.5*(length-of-australia))^2 bigger than that.

    doctordevice,

    Fun fact: the surface area of Pluto is only about 4% larger than Russia.

    RandomVideos,

    So thats why Russia wanted to expand

    NigelFrobisher,

    Pluto unboxing video.

    dellish, w I want to be among those who deeply thoroughly understand & can accurately predict the path of future eclipses because this is amazing.

    When I was a kid my parents bought me a book called “practical astronomy with your calculator” that went over all the workings and formulae for calculating eclipses, moon phases, locations of the planets and heaps more. If you want to get into it I highly recommend this book or something similar.

    dellish,

    BTW the book was by Peter Duffett-Smith if that helps.

    Ashyr, w A Mysterious Wave-Like Structure in Our Galaxy Found to Be Slowly Slithering

    Is it like a zipper? Have we tried beaming music into it?

    psvrh,
    @psvrh@lemmy.ca avatar

    Why you only callin’ us when you got your dramas?

    PhAzE,

    I’m the ex

    CCMan1701A,

    All systems normal?

    troyunrau, w What would happen if you moved at the speed of light?
    @troyunrau@lemmy.ca avatar

    Aside from the fact that anything with mass cannot travel at the speed of light… Lots of fun things happen as you approach the speed of light. There’s an excellent mostly-hard sci fi novel called Tau Zero that explores this concept in depth and, despite being older, is worth the read.

    (1) Time dilation (the universe and you have different clocks).

    (2) blueshifting of objects in front of you. At 0.95c, basically all visible starlight in front of you has been blueshifted into ionizing radiation. Fun fun.

    (3) shape distortion. You become more needle-shaped – getting very long and skinny, as observed by the rest of the universe.

    (4) you become a nuke. At .99c if you run into anything, your kinetic energy related explosion would be roughly 6x the Tsar Bomba (largest nuke ever detonated) for each kg of mass. Or, put another way, each kg of your mass would impact with the energy of 3kg of antimatter contacting 3kg of matter. Boom.

    Sci fi always overlooks the last one. Near light speed combat is basically firing buckets of sand at planets and blowing them up.

    karmiclychee,

    Speaking of sci fi, Kim Stanley Robinson’s 2312 does a really good job of incorporating the existential dread and lurking horror of weaponized orbital mechanics.

    troyunrau,
    @troyunrau@lemmy.ca avatar

    Right! And that’s not even one percent of lightspeed.

    Shadow, w What would happen if you moved at the speed of light?
    @Shadow@lemmy.ca avatar

    Lizard babies, obviously.

    teft,
    @teft@lemmy.world avatar

    Warp 10 is much much faster than light. Warp 1 is the speed of light. Warp 10 is the speed of light times infinity which is considered “transwarp”.

    acockworkorange,

    Ackchuyally…

    NaibofTabr, w First Space Force guardian to be launched into space this summer

    Why did they use a picture of a space shuttle?

    po_tay_toes,
    @po_tay_toes@lemmy.sambands.net avatar

    They’re not allowed to show off the anti-grav vehicles yet.

    fidodo,

    Same reason the shuttles existed in the first place. To look cool /s

    henfredemars, w NASA's been pulling out of major astronomy meetings — and scientists are feeling the effects

    NASA is kill. They had something like a 50% budget cut planned.

    FundMECFSResearch, w 1.5TB of James Webb Space Telescope data dumped on the internet — new searchable database is the largest window into our universe to date
    Minarble, w Webb telescope just snapped direct image of worlds many light-years away

    You are looking at actual images of planets from another solar system… I just think that’s neat!

    Gradually_Adjusting,
    @Gradually_Adjusting@lemmy.world avatar

    That’s a trip. I keep having that moment with the JWST where I think okay, now I get the hype and then it surprises me again.

    espentan,

    I, too, think that is neat!

    Who knows, maybe on one of them there are people, and maybe they put the dumbest one of them in charge, and now everyone is having a terrible time.

    XeroxCool,

    I saw the image embedded in one of the comments here before hut somehow didn’t realize the gravity of it until this thread

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