Yes, I really don't know at what temperature dust grains will vaporize and get blown out, it may well be that much larger chunks than 1 micron still...
Interesting fact: distance doesn't matter-- both the radiative force and gravity fall off like 1/r2. So a dust grain is either pushed out, or pulled...
De Sitter spacetime (roughly "empty spacetime" with a cosmological constant) does admit static coordinates (but it doesn't cover the whole manifold),...
My guess is that the phrase "flow of time" seems to suggest that 1 second can take more or less than 1 second, but that doesn't really make sense, 1...
Yes that is so strange, because what is meant a clock ticking at "a different rate"? Clocks tick at the rate that clocks tick, and any two clocks in...
Yes, the curvature is the "invariant", whereas the "flow of time" is a kind of coordinate comparison that is more pictorial than physically real, but...
I can agree with that, but the same can be said about Newton's laws-- whatever dynamical principles came after were going to have to contain Newton's...
I'm saying that the way we do physics is we find laws that can be tested by seeing if A is followed by B, and/or if the occurrence of B means that A...
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