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Sep
11
answered If the speed at which the universe contracts in reverse time decreases over time, then how did scientists arrive at a date for “The Big Bang”?
Sep
2
reviewed Approve suggested edit on Questions about spiral galaxy arms
Aug
31
answered What is the relative time difference between us and a star system in outer layer of our galaxy?
Aug
31
comment What is the relative time difference between us and a star system in outer layer of our galaxy?
This is incorrect. First, gravitational time dilation depends on the gravitational potential, not the acceleration. Second, its contribution is actually an order of magnitude more significant than that of velocity. Thus, one cannot consider gravitational time dilation negligible in any situation in which the special-relativistic contribution is not counted as negligible.
Aug
29
reviewed Approve suggested edit on What is the relative time difference between us and a star system in outer layer of our galaxy?
Aug
21
reviewed Approve suggested edit on Why don't planets give off their own light?
Aug
16
revised Contradiction between Theory of Relativity and Newton's Law of Universal Gravitation?
statement about wrong chart
Aug
16
answered Contradiction between Theory of Relativity and Newton's Law of Universal Gravitation?
Aug
16
awarded  Custodian
Aug
16
reviewed No Action Needed Is it possible to extend the life of a star?
Aug
16
reviewed Approve suggested edit on big-bang-theory tag wiki excerpt
Aug
15
comment Infinite universe? How?
The Friedmann equations are much more general than either the vacuum condition or being spatially infinite. The whole section is more than a bit confused. @HDE226868 The implication, which this answer alludes to but fails to communicate clearly, is that the WMAP observations indicate spatially flatness, which under the modeling assumptions of the FRW family of solutions (global isotropy and homogeneity) would imply an infinite universe.
Aug
15
comment Infinite universe? How?
Your main error is in the following: "So it came from a singularity, and had a finite size at some point." This implication is completely wrong about the universe at large. Your subsequent error is this: "That's too crazy to swallow." That's just appeal to personal incredulity.
Aug
4
comment Can there be an infinity of humans in the Universe?
The kinds of numbers that answer "how many?" are called cardinal numbers--they are the generalization of counting, and include non-finite amounts. So when you say things like "it's obviously a smaller infinity" or "which is a much bigger infinity", you are mistaken, primarily because that's not how cardinal numbers work. But also because your claims are not at all obvious even if they were correct.
Aug
3
reviewed Approve suggested edit on Determining planetary positions on the celestial sphere by Right Ascension and Declination
Aug
3
reviewed Approve suggested edit on What is the maximum number of planets in the habitable zone?
Aug
3
reviewed Approve suggested edit on Generalised planets?
Aug
2
comment Can there be an infinity of stars in the Universe?
+1, though under the assumptions of large-scale homogeneity and isotropy (which are motivated mainly by cosmic background radiation), there are four qualitatively different kinds of possible spatial geometries, two of which are infinite (Euclidean $3$-space and hyperbolic $3$-space).
Aug
2
comment Can there be an infinity of stars in the Universe?
Your 'Answer A' assumes that $W$ is a finite value and then concludes that it's a finite value. It's a clear case of begging the question.
Aug
2
comment Can there be an infinity of stars in the Universe?
-1 the first two paragraphs are complete nonsense. The third effectively substitutes "observable universe" for "universe", a qualifier that is not present in the question.