timmdeeg's latest activity
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Ttimmdeeg replied to the thread B Is space stretching or is new space being created?.Perhaps this helps: https://www.astro.ucla.edu/~wright/cosmology_faq.html#MX Are galaxies really moving away from us or is space just...
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Ttimmdeeg replied to the thread B Rutgers finds a transparent Einstein Cross - apparently a dark matter "halo".Thanks, to me its hard to see though how 1) and 2) result in a dark matter halo without visible matter.
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Ttimmdeeg replied to the thread B Rutgers finds a transparent Einstein Cross - apparently a dark matter "halo".... around the bulge, yes. From here we start. The Bullet Cluster shows that even after collisions of Galaxies dark matter is still...
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Ttimmdeeg replied to the thread B Rutgers finds a transparent Einstein Cross - apparently a dark matter "halo".The main mass of a galaxy is located in its bulge. In this case separation is hard to imagine, isn't it?
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Ttimmdeeg replied to the thread B Rutgers finds a transparent Einstein Cross - apparently a dark matter "halo".As I understand it, many observations show that dark matter is gravitationally bound to visible matter. Supposed this dark matter halo...
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Ttimmdeeg reacted to Andy Resnick's post in the thread Our Beautiful Universe - Photos and Videos with
Like.
Tonight: Rabbit in the moon -
Ttimmdeeg reacted to collinsmark's post in the thread Our Beautiful Universe - Photos and Videos with Like.
The Jellyfish Nebula (a.k.a. IC 443, Sh 2-248) scooped up from my back patio, Feb. - Mar. 2025. The nebula is a supernova remnant found...
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Ttimmdeeg reacted to PeterDonis's post in the thread I I don't see how a black hole's event horizon can be crossed with Like.
No, that's not the two spacetimes. Both of the things you describe are true in the same spacetime--the "eternal" black hole spacetime...
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Ttimmdeeg replied to the thread I I don't see how a black hole's event horizon can be crossed.Agreed. My comment is related to the title of the Thread, not to Black holes evaporation, which makes things more complicated.
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Ttimmdeeg replied to the thread I I don't see how a black hole's event horizon can be crossed.Isn't the core of all these posts that these two spacetimes, the one where something crosses the event horizon in its proper time and...
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Ttimmdeeg reacted to PeterDonis's post in the thread B Matter density right after the decoupling with Like.
Yes. Because plasma doesn't work like air. Even at such extremely low density, it interacts strongly with light.
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Ttimmdeeg reacted to collinsmark's post in the thread Our Beautiful Universe - Photos and Videos with Like.
Have you tried flat frame calibration? I'm a stickler for flats. Every deep sky image I've ever posted here I've processed with flat...
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Ttimmdeeg reacted to collinsmark's post in the thread Our Beautiful Universe - Photos and Videos with Like.
Here's an image I captured last Tuesday night [Edit: actually, Monday night/Tuesday morning], a little less than a week before...
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Ttimmdeeg reacted to Andy Resnick's post in the thread Our Beautiful Universe - Photos and Videos with Like.
I had to get up pretty early for these: Taken @ 800mm (f/8), these are about 1:2 or 1:3 downsized. Upper image @ 1/60s ISO 200...
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Ttimmdeeg reacted to PeterDonis's post in the thread I Gravitational self-interaction: another attempt to replace Dark Matter with Like.
I'm not sure I said that. A sufficiently accurate numerical simulation (i.e., one that included all of the terms whose magnitude is...