alpha2cen Posted June 2, 2012 Posted June 2, 2012 Are there any empty vacuum space through which light can not travel in the Universe? Do we have any information about it? Are there any Dark Matter which has such property?
swansont Posted June 2, 2012 Posted June 2, 2012 Not that we know of. Light doesn't interact with dark matter except gravitationally (which is why it is dark), so DM would not be opaque.
Airbrush Posted June 5, 2012 Posted June 5, 2012 Are there any empty vacuum space through which light can not travel in the Universe? Do we have any information about it? Are there any Dark Matter which has such property? Light has no problem traveling through a total vacuum.
alpha2cen Posted June 7, 2012 Author Posted June 7, 2012 Light has no problem traveling through a total vacuum. How to make a total vacuum? Do we make a vacuum space which has no Casimir effect?
Airbrush Posted June 7, 2012 Posted June 7, 2012 How to make a total vacuum? Do we make a vacuum space which has no Casimir effect? If you could make a total vacuum, light would pass thru it. Why not?
swansont Posted June 7, 2012 Posted June 7, 2012 How to make a total vacuum? Do we make a vacuum space which has no Casimir effect? I don't think that's what Airbrush was implying. There's more than one definition of vacuum, and "complete absence of anything" is only one of them and isn't physically attainable. Since we're talking about real effects, I assume that real vacuums — the absence of real, massive particles — are what are being referred to. Light would have no problem traveling through such a vacuum.
alpha2cen Posted June 8, 2012 Author Posted June 8, 2012 Let us think about Black Hole. Near Black Hole, Is it an empty space light can not travel? ----------Black Hole center ----------surface -------------------------------------------------------------------------------------------------------->radial direction ----------very high mass region(Black Hole) ------light can not travel region ---------light bending region ------------light no effect region
Airbrush Posted June 8, 2012 Posted June 8, 2012 Let us think about Black Hole. Near Black Hole, Is it an empty space light can not travel? ----------Black Hole center ----------surface -------------------------------------------------------------------------------------------------------->radial direction ----------very high mass region(Black Hole) ------light can not travel region ---------light bending region ------------light no effect region Could the only total vacuum in the universe exist inside a black hole, the region between the event horizon and the singularity?
alpha2cen Posted June 9, 2012 Author Posted June 9, 2012 (edited) Think about light bending and gravity. Intensity of Gravity...0------low--------------------------------------------------------------------------------------------------------------------------------------------------------------------------->high Related phenomena..-----no affected ------small bended ---highly bended----critical bending --What happen?(light speed increase? critical bending? other phenomena?)----> Edited June 9, 2012 by alpha2cen
Aethelwulf Posted June 9, 2012 Posted June 9, 2012 First of all, there is no such thing as an empty space. I don't even think an empty space exists inside a black hole...
alpha2cen Posted June 9, 2012 Author Posted June 9, 2012 (edited) What is happen at the very high Gravity region? Total gravity = light attraction force + something???----> very highly empty state. Edited June 9, 2012 by alpha2cen
ACG52 Posted June 9, 2012 Posted June 9, 2012 There is no 'empty space'. All of space is filled with aprox. 400 million photons in every cubic meter. Everywhere. It's the CMBR.
alpha2cen Posted June 10, 2012 Author Posted June 10, 2012 (edited) There is no 'empty space'. It's the CMBR. CMBR is a light long wave. It is one of radio micro waves. Edited June 10, 2012 by alpha2cen
ACG52 Posted June 10, 2012 Posted June 10, 2012 CMBR is a light long wave. It is one of radio waves. CMBR is in the microwave range. It consists of photons.
alpha2cen Posted June 10, 2012 Author Posted June 10, 2012 CMBR is in the microwave range. It consists of photons. The microwave, i.e., electromagnetic wave is dragged by Black Hole.
ACG52 Posted June 10, 2012 Posted June 10, 2012 The microwave, i.e., electromagnetic wave is dragged by Black Hole. Which has to do with what?
alpha2cen Posted June 10, 2012 Author Posted June 10, 2012 According to Relativity theory Black Hole center <----------------------------dragging-------------------------- electromagnetic wave(for example microwave) *************************gravity force
ACG52 Posted June 11, 2012 Posted June 11, 2012 That's meaningless. Try using words instead of lines and arrows.
alpha2cen Posted June 11, 2012 Author Posted June 11, 2012 Do not use this kind of sentence. That's meaningless. ==> That is no meaning., I do not understand the meaning. Try using words instead of lines and arrows. ==> How about using a detail sentence instead of using figure?
hypervalent_iodine Posted June 11, 2012 Posted June 11, 2012 ! Moderator Note alpha2cen,For the purposes of discussion, you'll have to start being a bit more coherent. This thread will be closed if you can't start making sense and respond to people properly.
Airbrush Posted June 11, 2012 Posted June 11, 2012 First of all, there is no such thing as an empty space. I don't even think an empty space exists inside a black hole... What do you think will happen to atoms, or any kind of particles, inside a black hole? They instantly fall to the singularity and get shrunk to a point. I do believe that inside a black hole is totally void of matter, except the massive singularity. How could it be otherwise?
John Cuthber Posted June 11, 2012 Posted June 11, 2012 "They instantly fall to the singularity and get shrunk to a point." No. They do not. With a big enough black hole you could settle down and raise a family within the event horizon without knowing you were there. Did it not occur to you that to fall instantly they would need to travel at infinite speed which implies breaking the light barrier?
Airbrush Posted June 11, 2012 Posted June 11, 2012 (edited) You are correct for supermassive black holes that are feeding, but for any-sized mass black holes, which are not feeding, inside the event horzon is totally void of matter, except the singularity. Edited June 11, 2012 by Airbrush
alpha2cen Posted June 11, 2012 Author Posted June 11, 2012 (edited) How can we recognize the Black Holes, which are not feeding, through the telescope in the space? Edited June 11, 2012 by alpha2cen
ACG52 Posted June 12, 2012 Posted June 12, 2012 You are correct for supermassive black holes that are feeding, but for any-sized mass black holes, which are not feeding, inside the event horzon is totally void of matter, except the singularity. Do you have any kind of citation for this claim. Because, given that we don't know what the singularity acutally is, and we don't know the physics inside the event horizon, to make the claim that there is no matter inside the event horizon is a bit premature.
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