I dont think anyone knows much about space at all, let alone how it was created.
SBZ does have a point though. The origin of the low entropy, organised early universe is one of the big questions in science.
This is where valid theory can stray across into conjecture and leave scientists that are not careful in how they present such discussions open to trolling, naysayers and sensationalism.
So, if a mass suddenly appeared , how lonh would it take for a body at a distnce from that mass to be subject to the gravitatioanl field the ‘new’ mass created?
The impact of the new mass on space-time propagates at the cosmic speed limit (also the speed of light).
Do photons have zero mass? But their path is affected by other large masses. There is a lovely lensing effect picture on here recently.
The space-time through which the photons travel is warped by the mass. As far as the photon is ‘concerned’ it is still travelling in a straight line within that space-time reference frame…
…sort of.
On a related note, does anybody know hoe fast gravity travels/ works?
At the ‘cosmic speed limit’. That speed also happens to be the speed of light (in a vacuum). Photons have no mass and therefore MUST travel at the cosmic speed limit…
…apparently.
repeated by the bending of light by the dark matter’s gravity well
More like the mass of the visible and dark matter warping space/time within which the light would still appear to be travelling in a straight line, but resulting in multiple images for us to observe…
The dark matter distribution is deduced from the multiple images of very distant background galaxies that have been gravitationally lensed by the dark matter.
They are the multiple blue streaky blobs that are distributed in multiple arcs around the central set of nearby fuzzy blobs (galaxies).
Many of the blue streaks/arcs are actually multiple images of the same galaxy…
…HTH. EDIT: maybe just saying the same as above though 🙁
Trails were fine today. I spent about 4 hours going up and down and around and around at the top end of the forest. A bit frozen and some snow 🙂 A few puddles on the original Black singletrack.
New Red just fine…the new woodwork could get *very* interesting through the winter though 😉
I was looking at maps to see if there was an alternative to the climb past the Moorcock Inn to get you over to where the Highway itself meets the road a few miles to the East nearer to Hawes. There are some tracks marked going northeast from the top of the Coal Road, but not sure that’s viable.
Likewise!
I did do the climb up the Highway from near Hawes on another Dales BW monster outing. Definitely worth linking into a route.
Ditto on the Garsdale choice. That isn’t an obvious route up. The BW over High Dolpinsky might also have been ‘interesting’!
Did this as a one way from Long Preston -> Kirby Stephen during the dry but cool summer. A great outing. Got the train back after some very civilised refreshment in the retro cafe at the Kirby Stephen station :))
Need to do the bit from the MTL to Long Preston and the northerly bits when opened.
Best descent for me was Horse Head to Halton Gill (at the top end of Littondale). You should definitely try to do this. We approached it from Langstrothdale and its basically a push up
Definitely do this as a descent *into* Langstrothdale. Much better 🙂
[/url]