Spyman

If space is expanding and bringing matter with it so we can measure the speed away from us, then I think that mass would have momentum. Thus a force is needed to put the breaks on the expansion. I don't think J.C.MacSwell is suggesting that space itself has inertia.

Nice picture from Wikipedia: http://en.wikipedia.org/wiki/Image:Kuiper_oort.jpg Artist's rendering of the Kuiper Belt and Oort Cloud.

I may be totally off but since none has answered, I remember this thread by Martin: Astronomy puzzle (angular-size/redshift) http://www.scienceforums.net/forums/showthread.php?t=22200

The layer of light particles is called a photon sphere.

I think the change in philosophical thoughts about time and space is interesting. Time is no longer created at the Big Bang, it is possible to calculate back to before BB. Is it also possible/problable to have a continuing line of BBs by repeted bounces ? How about space, it is there during the bounce and so also both before and after, but do they think space is small or big during the bounce ? Is "all" space contracted with matter to a very small volume or only "local" space surrounding matter and affected by gravity ?

Hi Martin, So likely the singularities is going to be removed, personally I think that is good. But that raises the questions about what is inside a Black Hole ? I would like to visualize it, in my simple layman way . . . If gravity becomes repulsive in the middle and sort of balances out the gravity from outside then: - Will that make enough room for the matter ? - What cind of matter will the BH consist of ? - How will the matter be shaped inside EH ? - Will this theory put new limits on BH sizes ?

Well, the Sun is a good energy source, while the Sun is active there is no need to spare energy, and without the Sun it's unlikely that life would ever arise and evole. Why, it's always easier to annihilate life before it becomes intelligent ? I don't think we will ever use gravity waves for communication. Radio waves are cheaper and as fast. There is no evidence for they not to excist, we have not yet explored our solar system good enough... But if some alien technology is hiding out in our solar system it's not likely for it to be "evil": - "Evil" would destory all life, not just intelligent. Life or intelligense is easier to destroy/prevent before intelligense arise. - In a very short time, (in the scale of 4.5 Billion Years), we will be able to resist and counter attacks, so if they are here they have overslept or mailfunction. (We are already intelligent and collecting knowledge at accelerating speed.) - The Universe is huge but the Sun is only 4.5 Billion Years old, so the precense of our solar system is only known inside a radius of 4.5 Billion lightyears and it takes some time for the probes to get here too, so if they are here already they have arrived from inside a radius less than 2.25 Billion lightyears. (Not so big, compared with a Universe with a radius of 78 Billion lightyears.) So if there are any alien probes hiding inside our system, they are not waiting for the correct time to strike, (to late already), they would have some other purpose, and thus I would no longer call them Beserker probes. Alien probes could be hiding to spy on us though: http://www.space.com/searchforlife/seti_alien_shostak_040122.html (And those probes could be controlled self-replicating von Neumann machines.)

Wikipedia http://en.wikipedia.org/wiki/Black_Hole Event Horizon http://library.thinkquest.org/25715/index.htm AbsoluteAstronomy http://www.absoluteastronomy.com/encyclopedia/b/bl/black_hole.htm The Mystery of Black Holes http://nrumiano.free.fr/Estars/b_holes.html

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A transistor can do the same thing, now is that mechanics or electronics ? I guess it all depends on personal definitions of the word mechanics and in which context it's used. For me mechanical is more like moving parts in a machine.

Von Neumann probes would only push the problem with life arising further back, life must still have started somewhere for the probes to be created. Life on Earth seems to have developed on random and any aliens creating these probes would most likely have some reason, thus such life should be engineered towards a purpose. I find it easier and less complicated to belive life arised here. When a Solarsystem with planets are born there must be some random chunks left over. http://www.space.com/scienceastronomy/solarsystem/asteroids-ez.html Since we are not extinct or under control suggests beserker probes neither have or are here. (The beserker probes could hide dormant for some wake-up-call or still be on their way here, but then they can't have caused past extinctions.) It is much more probably that the asteroids have changed course during collisions or by gravitationally influense. So my answer is NO to both questions.

Mars Hoax Circulates the Internet: http://www.space.com/scienceastronomy/050708_mars_hoax.html

Well, it's just a though that have "popped" up in my mind... It steamed from the relativistic use of Time as an equal part of a position in space-time and as we move forward in Time space expands, reverse Time to BB and You are in the center. The future is outside the "balloon", the skin is the present and the past is inside. EDIT: (Wick rotation) http://math.ucr.edu/home/baez/week207.html http://en.wikipedia.org/wiki/Wick_rotation http://superstringtheory.com/forum/scirelig/messages10/133.html

Why ? You need Four dimensions for creating a hypersphere... Can't time be considered as the first dimension, thus the radius of the hypersphere ?

There is no weird effects here:- if the light rays are moving straigh up then they will escape from the EH and out' date=' - if the light rays are moving straigh down then they will get caught from infinity and in, (eventually), - if the light rays are moving in an orbital direction at correct distance then they will orbit. Likewise with a spaceship, moving away, (with higher than escape velocity), from Earth or a BH, will allow it escape, (if above EH), moving against will allow it to land or make it crash, but moving with correct speed depending on radius with a direction around 90 degrees from against/away will let it orbit. Escape velocity is calculated for the direction straight up. If You where to stand on the Moon and point a flashlight towards Earth, will the light ray "escape" Earths gravity field or will the photons reach the surface ? (Can You see the Moon and stars at night ?) I have never heard about this surface. From my understanding a spaceship can, (with very high speed), pass the Photon Sphere, almost touch the Event Horizon and still escape. Any object with any mass should be able to orbit just above the Photon Sphere, with very high speed. So, I am at a loss what You mean here ? Direction is the keyword, (of the light rays). (And from my quote: "(very) unstable orbits".)

I thought my Quote from Wikipedia explained that part very well... (I should have duplicated the bolded part of the text instead.)

Outside of the Event Horizon, light or even a spaceship can escape, but if "escaping" then it's no longer in orbit. (Edit: Escaping inside the Photon Sphere requires a non orbital path.) Light rays in the Photon Sphere have just the right direction of travel to maintain their orbit.

Your mass will be great enough if the density grows high enough. But Hawking Radiation will cause small Black Holes to evaporate very fast. http://www.scienceforums.net/forums/showthread.php?t=9500 http://en.wikipedia.org/wiki/Hawking_radiation

No, to escape You need to reach the Escape Velocity. As soon as You stop accelerating, below EV, the gravity will catch You again. http://en.wikipedia.org/wiki/Escape_velocity No, in theory gravity and acceleration is the same. Thus such an mighty acceleration should turn You into a Black Hole. http://en.wikipedia.org/wiki/Acceleration EDIT: Also according to theory there is no path out from a Black Hole. Which direction are You going to accelerate in when all directions leads to the Singularity ?

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Nobody knows whats inside the Event Horizon, we only have mathematical models which predicts certain properties. And there are several of them: Gravastar http://en.wikipedia.org/wiki/Gravastar http://en.wikipedia.org/wiki/Dark-energy_star Black Hole http://en.wikipedia.org/wiki/Black_hole The Singularity http://en.wikipedia.org/wiki/Black_hole#The_singularity Even without Relativity one could say that the pressure inside the body grows high enough to crush the structure of the atom and then the structure of the neutron. http://en.wikipedia.org/wiki/Black_hole#Rotating_black_holes http://en.wikipedia.org/wiki/Universe#Fate_of_the_Universe

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Well, I tried to look at the video but failed, the link is dead. Some search and I found this: (posted First of June of 2005) http://www.trials-forum.co.uk/forum/index.php?showtopic=56190 After some more search I found the video: Posting And You... by Lunchitmemama http://www.albinoblacksheep.com/flash/posting.php Hopefully this link will last a little longer...