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  • The Schwarzchild radius is the radius to the event horizon, which increases with mass. The singularity (if it exists) has no size exactly- it's infinitely small and dense.

    (This is just what GR equations say, we obviously don't and probably cannot ever know what's really beyond the event horizon. I would guess most physicists probably think you can't have infinities in physical quantities i.e. no singularity.)

    I barely studied GR and certainly not white holes I'm afraid so not much help here. Dark matter is just matter that we can't currently detect so probably fair to assume it acts in the same way as everything else does. I had a read of the Wikipedia page on white holes and couldn't figure out whether or not mass/energy would pass straight through or get mashed. Probably safest to assume everything gets mashed with a singularity but you could instead go for the Einstein-Rosen bridge thing which (I think) doesn't have a singularity, just a nice smooth "tube" in spacetime connecting two bits together, as opposed to the infinite spike of a singularity.

    Has it been written about? - not sure but I have an extremely vague memory of reading someone's idea (could be a book, comment, tweet, no idea) that Bad Guys created black holes so they could steal our matter because they didn't have any. Like after heat death or something.

  • Thanks for replying, that’s very helpful.

    Einstein-Rosen bridge thing which (I think) doesn't have a singularity, just a nice smooth "tube" in spacetime

    This might work, I’ll do more research, thanks for suggesting it.

    Bad Guys created black holes so they could steal our matter

    Good to know the idea is out there. I’d love to create some deja entendu but haven’t found any other source material to build on.

  • Just saw 2 satellites in about 5 mins in the worse light pollution (London).

    I remember when it was exciting to see a satellite cross our skies. We'd wait hours and probably still have to wait another sitting.

    Now...

    Still tickles me

    But I'd love to see the ISS.

  • ISS went over at 8 this evening.

  • But I'd love to see the ISS.

    Haven't you seen it? Takes very little planning...

  • Haven't you seen it? Takes very little planning...

    Rub it in.... I've seen your specs...

  • The James D site has tickled me! Plocks you on your street!

  • 63 seconds with a 200mm lens earlier this week


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  • What we looking at?

  • Space: the final frontier

  • M31, Andromeda Galaxy with it's dwarf companion m33 above.

    The blob at the centre contains billions of stars, the milky extended shape a few billion more in a disc shape.

    It's coming towards us, to mix and distort us and them beyond recognition. Thought it still 100M lightyears away. So the light in this image left Andromeda around the time dinosaurs were prancing about on Earth.

  • Altho, in all seriousness, looks like something in the Orion constellation.

    edit ; shows you what I know!

  • M31 is found in Pegasus

  • So cool

    So so cool

  • It's coming towards us, to mix and distort us and them beyond recognition. Thought it still 100M lightyears away. So the light in this image left Andromeda around the time dinosaurs were prancing about on Earth.

  • Well, to the left of Pegasus, in Andromeda…

  • Sorry, I’m back with more space, this time shot with my iPhone SE (old version) through my new scope.


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  • Why sorry?!

    Literally the thread for it 😂

  • My phone is the old SE (the last sensible sized phone Apple made) but it doesn't produce nice shots like that.

  • Thank you! Here’s more. A clear gap between snow showers was enough to justify going out in my Carnac sliders last night.


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  • That the seven sisters? I used to be able to see them with the my naked eye... When I had eyesight of a young man/child.

  • Yep, that’s them.

  • Less than a month to go before James Webb launches, fingers crossed all goes well... Very excited to see where this takes us and what we'll learn...


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Stars / Astronomy

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